{"id":19558,"date":"2025-11-09T14:27:00","date_gmt":"2025-11-09T06:27:00","guid":{"rendered":"https:\/\/viox.com\/?p=19558"},"modified":"2025-11-09T14:27:02","modified_gmt":"2025-11-09T06:27:02","slug":"what-is-low-level-trigger-relay-arduino","status":"publish","type":"post","link":"https:\/\/test.viox.com\/ko\/what-is-low-level-trigger-relay-arduino\/","title":{"rendered":"\ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70 \ub9b4\ub808\uc774\ub780 \ubb34\uc5c7\uc785\ub2c8\uae4c? (\uadf8\ub9ac\uace0 Arduino \ud504\ub85c\uc81d\ud2b8\uc5d0 \uc65c \ud544\uc694\ud55c\uac00)"},"content":{"rendered":"<div class=\"product-intro\">\n<h2>\uc18c\uac1c: \uacb0\ucf54 \uc624\uc9c0 \uc54a\uc740 \ub538\uae4d \uc18c\ub9ac<\/h2>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-19563\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-Click-That-Never-Came.webp\" alt=\"The Click That Never Came\" width=\"800\" height=\"800\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-Click-That-Never-Came.webp 800w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-Click-That-Never-Came-300x300.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-Click-That-Never-Came-150x150.webp 150w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-Click-That-Never-Came-768x768.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-Click-That-Never-Came-12x12.webp 12w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-Click-That-Never-Came-600x600.webp 600w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-Click-That-Never-Came-100x100.webp 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>\uc0c8\ubcbd 2\uc2dc 47\ubd84. \ub2f9\uc2e0\uc740 \uc138 \uc2dc\uac04 \ub3d9\uc548 \uc774 \uc77c\uc5d0 \ub9e4\ub2ec\ub824 \uc788\uc5c8\uc2b5\ub2c8\ub2e4.<\/p>\n<p>\ub2f9\uc2e0\uc758 \uc544\ub450\uc774\ub178 \ud504\ub85c\uc81d\ud2b8\ub294 \uc644\ubcbd\ud574 \ubcf4\uc785\ub2c8\ub2e4. \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc740 \ube0c\ub808\ub4dc\ubcf4\ub4dc \uc704\uc5d0 \ub193\uc5ec \uc788\uc73c\uba70, \ud29c\ud1a0\ub9ac\uc5bc\uc5d0\uc11c \ubcf4\uc5ec\uc900 \uac83\uacfc \uc815\ud655\ud788 \ub611\uac19\uc774 \ubc30\uc120\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4. VCC\ub97c 5V\uc5d0, GND\ub97c GND\uc5d0, IN1\uc744 \ub514\uc9c0\ud138 \ud540 7\uc5d0 \uc5f0\uacb0\ud588\ub294\uc9c0 \uc138 \ubc88 \ud655\uc778\ud588\uc2b5\ub2c8\ub2e4. \ucf54\ub4dc\uac00 \ucef4\ud30c\uc77c\ub429\ub2c8\ub2e4. \ub2f9\uc2e0\uc740 \uadf8\uac83\uc744 \uc5c5\ub85c\ub4dc\ud569\ub2c8\ub2e4. \ud540 7\uc774 HIGH\ub85c \uac11\ub2c8\ub2e4.<\/p>\n<p>\uadf8 400A.<\/p>\n<p>\ub538\uae4d \uc18c\ub9ac\uac00 \ub098\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. LED\ub3c4 \ucf1c\uc9c0\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \ub9b4\ub808\uc774\ub294 \uadf8\uc800... \uac70\uae30\uc5d0 \uc549\uc544 \ub2f9\uc2e0\uc744 \uc870\ub871\ud569\ub2c8\ub2e4.<\/p>\n<p>\ub9b4\ub808\uc774 \ubaa8\ub4c8\uc744 \uad50\uccb4\ud569\ub2c8\ub2e4. \uc5ec\uc804\ud788 \uc544\ubb34\uac83\ub3c4 \uc5c6\uc2b5\ub2c8\ub2e4. \ub2e4\ub978 \uc544\ub450\uc774\ub178 \ud540\uc744 \uc2dc\ub3c4\ud574 \ubd05\ub2c8\ub2e4. \uc548 \ub429\ub2c8\ub2e4. \ud540\uc744 HIGH\ub85c \uc124\uc815\ud558\uace0 \uc788\ub294\uc9c0 \ud655\uc2e4\ud788 \ud558\uae30 \uc704\ud574 \ucf54\ub4dc\ub97c \ub2e4\uc2dc \uc791\uc131\ud569\ub2c8\ub2e4. HIGH\ub85c \ud655\uc778\ub429\ub2c8\ub2e4. 5\ubcfc\ud2b8\uc785\ub2c8\ub2e4. \uba40\ud2f0\ubbf8\ud130\ub3c4 \ub3d9\uc758\ud569\ub2c8\ub2e4.<\/p>\n<p>\uadf8\ub9ac\uace0 <a href=\"https:\/\/test.viox.com\/ko\/the-5-different-types-of-relays\/\">\uacc4\uc804\uae30<\/a> \uc5ec\uc804\ud788 \uc791\ub3d9\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n<p>\uadf8\ub7ec\ub2e4\uac00 \uc808\ubc15\ud568\uc774\ub098 \uce74\ud398\uc778\uc73c\ub85c \uc778\ud55c \ud638\uae30\uc2ec\uc73c\ub85c \ucf54\ub4dc \ud55c \uc904\uc744 \ubcc0\uacbd\ud569\ub2c8\ub2e4.<\/p>\n<pre><code>digitalWrite(relayPin, LOW); \/\/ HIGH\uc5d0\uc11c \ubcc0\uacbd\ub428<\/code><\/pre>\n<p>\ub538\uae4d.<\/p>\n<p>\ub9b4\ub808\uc774\uac00 \uc791\ub3d9\ud569\ub2c8\ub2e4. LED\uac00 \ucf1c\uc9d1\ub2c8\ub2e4. \ud38c\ud504\uac00 \uc791\ub3d9\ud558\uae30 \uc2dc\uc791\ud569\ub2c8\ub2e4. \ubaa8\ub4e0 \uac83\uc774 \uc791\ub3d9\ud569\ub2c8\ub2e4.<\/p>\n<p>\uc7a0\uae50\u2026 \ubb50\ub77c\uace0? \ud540\uc744 HIGH \ub300\uc2e0 LOW\ub85c \uc124\uc815\ud588\uc744 \ub54c \ub9b4\ub808\uc774\uac00 \uc791\ub3d9\ud55c\ub2e4\uace0? \uadf8\uac74 \uac70\uafb8\ub85c\uc796\uc544. \uadf8\uac74 \ud2c0\ub838\uc5b4. \uadf8\uac74\u2014<\/p>\n<p>\uc0ac\uc2e4, \uadf8\uac83\uc774 \ubc14\ub85c \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70 \ub9b4\ub808\uc774\uac00 \uc791\ub3d9\ud558\ub294 \ubc29\uc2dd\uc785\ub2c8\ub2e4. \uadf8\ub9ac\uace0 \uc77c\ub2e8 \uadf8 \uc774\uc720\ub97c \uc774\ud574\ud558\uba74, \uadf8\uac83\ub4e4\uc774 \uc774\uc0c1\ud55c \uac83\uc774 \uc544\ub2c8\ub77c \uc2e4\uc81c\ub85c \ub354 \uc2a4\ub9c8\ud2b8\ud55c \ub514\uc790\uc778\uc774\ub77c\ub294 \uac83\uc744 \uae68\ub2eb\uac8c \ub420 \uac83\uc785\ub2c8\ub2e4.<\/p>\n<p>\uc124\uba85\ud574 \ub4dc\ub9ac\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<h2>\u201c\ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70\u201d\uc758 \uc2e4\uc81c \uc758\ubbf8 (\uc26c\uc6b4 \uc601\uc5b4\ub85c)<\/h2>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-19560\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Low-Level-Trigger-Relay-with-Optocoupler.webp\" alt=\"Low Level Trigger Relay (with Optocoupler)\" width=\"800\" height=\"800\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Low-Level-Trigger-Relay-with-Optocoupler.webp 800w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Low-Level-Trigger-Relay-with-Optocoupler-300x300.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Low-Level-Trigger-Relay-with-Optocoupler-150x150.webp 150w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Low-Level-Trigger-Relay-with-Optocoupler-768x768.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Low-Level-Trigger-Relay-with-Optocoupler-12x12.webp 12w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Low-Level-Trigger-Relay-with-Optocoupler-600x600.webp 600w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Low-Level-Trigger-Relay-with-Optocoupler-100x100.webp 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>\ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70 \ub9b4\ub808\uc774\ub294 \uc81c\uc5b4 \ud540\uc774 HIGH \uc2e0\ud638 (5V) \ub300\uc2e0 LOW \uc2e0\ud638 (0V\/GND)\ub97c \uc218\uc2e0\ud560 \ub54c \ud65c\uc131\ud654\ub429\ub2c8\ub2e4.<\/p>\n<p>\ub514\uc9c0\ud138 \ub17c\ub9ac \uc6a9\uc5b4\ub85c:<\/p>\n<ul>\n<li>LOW \uc2e0\ud638 (0V) = \ub9b4\ub808\uc774 ON<\/li>\n<li>HIGH \uc2e0\ud638 (5V) = \ub9b4\ub808\uc774 OFF<\/li>\n<\/ul>\n<p>\uc774\uac83\uc740 \uc561\ud2f0\ube0c-\ub85c\uc6b0 \ub17c\ub9ac \ub610\ub294 \uc5ed \ub17c\ub9ac\ub77c\uace0\ub3c4 \ud569\ub2c8\ub2e4.<\/p>\n<p>\uc774\uac83\uc744 \ud558\uc774 \ub808\ubca8 \ud2b8\ub9ac\uac70 \ub9b4\ub808\uc774\uc640 \ube44\uad50\ud574 \ubcf4\uc2ed\uc2dc\uc624.<\/p>\n<ul>\n<li>HIGH \uc2e0\ud638 (5V) = \ub9b4\ub808\uc774 ON<\/li>\n<li>LOW \uc2e0\ud638 (0V) = \ub9b4\ub808\uc774 OFF<\/li>\n<\/ul>\n<p>\uadf8\uac8c \uc804\ubd80\uc785\ub2c8\ub2e4. \uadf8\uac83\uc774 \ud575\uc2ec\uc801\uc778 \ucc28\uc774\uc810\uc785\ub2c8\ub2e4. \ud558\uc9c0\ub9cc \uc5ec\uae30\uc11c \ud765\ubbf8\ub85c\uc6b4 \uc810\uc740 \uc65c \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc774 \uac89\ubcf4\uae30\uc5d0 \uac70\uafb8\ub85c \ub41c \uc811\uadfc \ubc29\uc2dd\uc744 \uc0ac\uc6a9\ud560\uae4c\uc694?<\/p>\n<h2>\uc65c \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc740 \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70\ub9c1\uc744 \uc0ac\uc6a9\ud560\uae4c\uc694? (\ube44\ubc00\uc740 \uc635\ud1a0\ucee4\ud50c\ub7ec\uc5d0 \uc788\uc2b5\ub2c8\ub2e4)<\/h2>\n<p>\ub300\ubd80\ubd84\uc758 \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc740 \ub9b4\ub808\uc774\ub9cc \uc788\ub294 \uac83\uc774 \uc544\ub2c8\ub77c \uc644\uc804\ud55c \ub4dc\ub77c\uc774\ubc84 \ud68c\ub85c\uac00 \ub0b4\uc7a5\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4. \uc774 \ud68c\ub85c\uc758 \ud575\uc2ec\uc740 \uc635\ud1a0\ucee4\ud50c\ub7ec (\ub610\ub294 \uc635\ud1a0\uc544\uc774\uc194\ub808\uc774\ud130\ub77c\uace0\ub3c4 \ud568)\uc774\uba70, \uc77c\ubc18\uc801\uc73c\ub85c PC817 \ub610\ub294 \uc720\uc0ac\ud55c \uac83\uc785\ub2c8\ub2e4.<\/p>\n<h3>\uc635\ud1a0\ucee4\ud50c\ub7ec \ud68c\ub85c \uc124\uacc4<\/h3>\n<p>\ub9b4\ub808\uc774 \ubaa8\ub4c8 \ub0b4\ubd80\uc5d0 \uc2e4\uc81c\ub85c \uc788\ub294 \uac83\uc740 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n<h4>\uc785\ub825 \uce21 (\uc81c\uc5b4 \uc2e0\ud638):<\/h4>\n<ul>\n<li>\uc544\ub450\uc774\ub178\uc758 \ub514\uc9c0\ud138 \ud540\uc774 \u201cIN\u201d\uc5d0 \uc5f0\uacb0\ub429\ub2c8\ub2e4.\u201d<\/li>\n<li>IN\uc740 \uc635\ud1a0\ucee4\ud50c\ub7ec \ub0b4\ubd80\uc758 LED\uc5d0 \uc5f0\uacb0\ub429\ub2c8\ub2e4 (\uc800\ud56d\uc744 \ud1b5\ud574).<\/li>\n<li>LED\uc758 \uce90\uc18c\ub4dc\ub294 GND\uc5d0 \uc5f0\uacb0\ub429\ub2c8\ub2e4.<\/li>\n<\/ul>\n<h4>\ucd9c\ub825 \uce21 (\ub9b4\ub808\uc774 \ucf54\uc77c):<\/h4>\n<ul>\n<li>\ud3ec\ud1a0\ud2b8\ub79c\uc9c0\uc2a4\ud130 (\uc635\ud1a0\ucee4\ud50c\ub7ec \ub0b4\ubd80)\uac00 LED\uc758 \ube5b\uc744 \uac10\uc9c0\ud569\ub2c8\ub2e4.<\/li>\n<li>\uc774 \ud2b8\ub79c\uc9c0\uc2a4\ud130\ub294 NPN \ud2b8\ub79c\uc9c0\uc2a4\ud130 (\uc608: 2N3904)\ub97c \uad6c\ub3d9\ud569\ub2c8\ub2e4.<\/li>\n<li>NPN \ud2b8\ub79c\uc9c0\uc2a4\ud130\ub294 \ub9b4\ub808\uc774 \ucf54\uc77c\uc5d0 \uc804\uc6d0\uc744 \uacf5\uae09\ud569\ub2c8\ub2e4.<\/li>\n<\/ul>\n<p>\uc911\uc694\ud55c \uc138\ubd80 \uc0ac\ud56d: \uc635\ud1a0\ucee4\ud50c\ub7ec\uc758 LED\ub294 VCC\uc640 IN \ud540 \uc0ac\uc774\uc5d0 \ubc30\uc120\ub429\ub2c8\ub2e4. \uc774\uac83\uc774 \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70\ub9c1\uc744 \uc774\ud574\ud558\ub294 \ud575\uc2ec\uc785\ub2c8\ub2e4.<\/p>\n<h3>\ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70\ub9c1 \uc791\ub3d9 \ubc29\uc2dd<\/h3>\n<p>IN \ud540 = HIGH (5V)\uc77c \ub54c:<\/p>\n<ul>\n<li>LED \uc591\ub2e8\uc758 \uc804\uc555 \ucc28\uc774 = 5V \u2013 5V = 0V<\/li>\n<li>LED\ub97c \ud1b5\ud574 \uc804\ub958\uac00 \ud750\ub974\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/li>\n<li>LED\uac00 \uaebc\uc838 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<li>\ud3ec\ud1a0\ud2b8\ub79c\uc9c0\uc2a4\ud130\uac00 \uaebc\uc838 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<li>\ub9b4\ub808\uc774 \ucf54\uc77c\uc5d0 \uc804\uc6d0\uc774 \uacf5\uae09\ub418\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/li>\n<li>\ub9b4\ub808\uc774\uac00 \uaebc\uc838 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<\/ul>\n<p>IN \ud540 = LOW (0V\/GND)\uc77c \ub54c:<\/p>\n<ul>\n<li>LED \uc591\ub2e8\uc758 \uc804\uc555 \ucc28\uc774 = 5V \u2013 0V = 5V<\/li>\n<li>\uc804\ub958\uac00 LED\ub97c \ud1b5\ud574 \ud750\ub985\ub2c8\ub2e4 (\uc800\ud56d\uc5d0 \uc758\ud574 \uc81c\ud55c\ub428).<\/li>\n<li>LED\uac00 \ucf1c\uc9d1\ub2c8\ub2e4.<\/li>\n<li>\ud3ec\ud1a0\ud2b8\ub79c\uc9c0\uc2a4\ud130\uac00 \ucf1c\uc9d1\ub2c8\ub2e4.<\/li>\n<li>NPN \ud2b8\ub79c\uc9c0\uc2a4\ud130\uac00 \uc804\ub3c4\ud569\ub2c8\ub2e4.<\/li>\n<li>\ub9b4\ub808\uc774 \ucf54\uc77c\uc5d0 \uc804\uc6d0\uc774 \uacf5\uae09\ub429\ub2c8\ub2e4.<\/li>\n<li>\ub9b4\ub808\uc774\uac00 \ucf1c\uc9d1\ub2c8\ub2e4.<\/li>\n<\/ul>\n<p>\u201c\uc544\ud558!\u201d \uc21c\uac04: \ud68c\ub85c\ub294 IN \ud540\uc744 \ud1b5\ud574 VCC\uc5d0\uc11c GND\ub85c \uc804\ub958\ub97c \ub04c\uc5b4\uc635\ub2c8\ub2e4. \uc544\ub450\uc774\ub178 \ud540\uc774 LOW\uc77c \ub54c \uc811\uc9c0\ub85c \uac00\ub294 \uacbd\ub85c\ub97c \uc81c\uacf5\ud558\uc5ec \ud68c\ub85c\ub97c \uc644\uc131\ud569\ub2c8\ub2e4. HIGH\uc77c \ub54c\ub294 \uc804\uc555 \ucc28\uc774\uac00 \uc5c6\uc73c\ubbc0\ub85c \uc804\ub958\uac00 \ud750\ub974\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n<h2>\uc65c \uc774 \ub514\uc790\uc778\uc774 \uc2e4\uc81c\ub85c \ud6cc\ub96d\ud560\uae4c\uc694?<\/h2>\n<ol>\n<li><strong>\ud398\uc77c \uc138\uc774\ud504 \ub3d9\uc791:<\/strong> \uc81c\uc5b4 \uc640\uc774\uc5b4\uac00 \ub04a\uc5b4\uc9c0\uac70\ub098 \uc5f0\uacb0\uc774 \ub04a\uc5b4\uc9c0\uba74 IN \ud540\uc740 \ud6a8\uacfc\uc801\uc73c\ub85c HIGH\ub85c \ud50c\ub85c\ud305\ub429\ub2c8\ub2e4 (\uc800\ud56d \ub124\ud2b8\uc6cc\ud06c\uc5d0 \uc758\ud574 \ub0b4\ubd80\uc801\uc73c\ub85c \ud480\uc5c5\ub428). \uc774\uac83\uc740 \uc2e4\uc218\ub85c \ucf1c\uc9c0\ub294 \uac83\ubcf4\ub2e4 \uae30\ubcf8\uc801\uc73c\ub85c \ub9b4\ub808\uc774\ub97c OFF \uc0c1\ud0dc\ub85c \uc720\uc9c0\ud569\ub2c8\ub2e4.<\/li>\n<li><strong>\ud50c\ub85c\ud305 \ud540\uc5d0 \ub300\ud55c \ubcf4\ud638:<\/strong> \uc544\ub450\uc774\ub178 \ubd80\ud305 \uc911\uc5d0\ub294 \ud540\uc774 \uba87 \ubc00\ub9ac\ucd08 \ub3d9\uc548 \uc815\uc758\ub418\uc9c0 \uc54a\uc740 \uc0c1\ud0dc\uc5d0 \uc788\uc2b5\ub2c8\ub2e4. \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70\ub97c \uc0ac\uc6a9\ud558\uba74 \uc77c\ubc18\uc801\uc73c\ub85c \ub9b4\ub808\uc774 ON (\uace0\uc804\ub825 \ubd80\ud558\uc5d0 \uc7a0\uc7ac\uc801\uc73c\ub85c \uc704\ud5d8\ud568)\uc774 \uc544\ub2cc \ub9b4\ub808\uc774 OFF (\uc548\uc804\ud568)\uac00 \ub429\ub2c8\ub2e4.<\/li>\n<li><strong>\ub9c8\uc774\ud06c\ub85c\ucee8\ud2b8\ub864\ub7ec\uc758 \ub0ae\uc740 \uc804\ub958 \uc18c\ubaa8:<\/strong> \ub9b4\ub808\uc774\uac00 OFF\uc77c \ub54c (\ub9ce\uc740 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c \uac00\uc7a5 \uc77c\ubc18\uc801\uc778 \uc0c1\ud0dc), \ub9c8\uc774\ud06c\ub85c\ucee8\ud2b8\ub864\ub7ec \ud540\uc740 HIGH\uc774\uace0 \uac70\uc758 0\uc758 \uc804\ub958\ub97c \uc18c\uc2f1\ud569\ub2c8\ub2e4. \ub9b4\ub808\uc774\ub97c \ud65c\uc131\ud654\ud574\uc57c \ud560 \ub54c \ud540\uc740 LOW\ub85c \uc774\ub3d9\ud558\uc5ec \uc804\ub958\ub97c \uc2f1\ud06c\ud569\ub2c8\ub2e4. \uc774\ub294 \ub9c8\uc774\ud06c\ub85c\ucee8\ud2b8\ub864\ub7ec \ud540\uc774 \uc77c\ubc18\uc801\uc73c\ub85c \uc18c\uc2f1\ud558\ub294 \uac83\ubcf4\ub2e4 \ub354 \uc798 \ucc98\ub9ac\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<li><strong>3.3V \ud638\ud658\uc131:<\/strong> ESP32 \ubc0f \uc720\uc0ac\ud55c 3.3V \uc7a5\uce58\ub294 \ud558\uc774 \ub808\ubca8 \uad6c\uc131\uc5d0\uc11c 5V \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc744 \uc548\uc815\uc801\uc73c\ub85c \uad6c\ub3d9\ud558\ub294 \ub370 \uc5b4\ub824\uc6c0\uc744 \uacaa\uc2b5\ub2c8\ub2e4. \uadf8\ub7ec\ub098 \ub85c\uc6b0 \ub808\ubca8 \ubaa8\ub4dc\uc5d0\uc11c\ub294 VCC\uac00 5V\uc778 \uacbd\uc6b0\uc5d0\ub3c4 3.3V \ud540\uc774 \uc811\uc9c0\ub85c \uc804\ub958\ub97c \uc2f1\ud06c\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub530\ub77c\uc11c \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70 \ubaa8\ub4c8\uc740 \ub354 \ubcf4\ud3b8\uc801\uc73c\ub85c \ud638\ud658\ub429\ub2c8\ub2e4.<\/li>\n<\/ol>\n<p>\uc804\ubb38\uac00 \ud301: \uc774\uac83\uc774 \ub300\ubd80\ubd84\uc758 \uc0c1\uc6a9 \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc774 \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70\ub85c \uae30\ubcf8 \uc124\uc815\ub418\ub294 \uc774\uc720\uc785\ub2c8\ub2e4. \ub354 \uac15\ub825\ud558\uace0 \ud638\ud658 \uac00\ub2a5\ud558\uba70 \ud398\uc77c \uc138\uc774\ud504 \ub514\uc790\uc778\uc785\ub2c8\ub2e4.<\/p>\n<h2>\ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70 \ub9b4\ub808\uc774 \ubc30\uc120 \ubc29\ubc95 (\ub2e8\uacc4\ubcc4)<\/h2>\n<h3>Arduino Uno (5V \ub85c\uc9c1) \uae30\ubcf8 \ubc30\uc120<\/h3>\n<h4>\uc804\uc6d0 \uc5f0\uacb0:<\/h4>\n<ul>\n<li>\ub9b4\ub808\uc774 VCC \u2192 Arduino 5V<\/li>\n<li>\ub9b4\ub808\uc774 GND \u2192 Arduino GND<\/li>\n<\/ul>\n<h4>\uc81c\uc5b4 \uc2e0\ud638:<\/h4>\n<ul>\n<li>\ub9b4\ub808\uc774 IN \u2192 Arduino \ub514\uc9c0\ud138 \ud540 (\uc608: \ud540 7)<\/li>\n<\/ul>\n<h4>\ucf54\ub4dc \uc608\uc81c:<\/h4>\n<pre><code>const int relayPin = 7;<\/code><\/pre>\n<p>\ubb34\uc2a8 \uc77c\uc774 \uc77c\uc5b4\ub098\uace0 \uc788\uc2b5\ub2c8\uae4c:<\/p>\n<ul>\n<li>HIGH (5V)\ub294 \ub9b4\ub808\uc774 OFF \uc720\uc9c0<\/li>\n<li>LOW (0V)\ub294 \ub9b4\ub808\uc774 ON<\/li>\n<\/ul>\n<h3>ESP32 (3.3V \ub85c\uc9c1) \ubc30\uc120<\/h3>\n<p>ESP32\ub294 HIGH\uc5d0\uc11c 3.3V\ub97c \ucd9c\ub825\ud558\ubbc0\ub85c \uc77c\ubd80 5V \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc5d0\uc11c \ubb38\uc81c\uac00 \ubc1c\uc0dd\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub2e4\uc74c\uc740 \uc2e0\ub8b0\ud560 \uc218 \uc788\ub294 \ubc29\ubc95\uc785\ub2c8\ub2e4.<\/p>\n<h4>\uc804\uc6d0 \uc5f0\uacb0:<\/h4>\n<ul>\n<li>\ub9b4\ub808\uc774 VCC \u2192 \uc678\ubd80 5V \uc804\uc6d0 \uacf5\uae09 \uc7a5\uce58 (\ub610\ub294 USB \uc804\uc6d0 \uc0ac\uc6a9 \uc2dc ESP32\uc758 5V \ud540)<\/li>\n<li>\ub9b4\ub808\uc774 GND \u2192 ESP32\uc640 \uacf5\ud1b5 \uc811\uc9c0<\/li>\n<\/ul>\n<h4>\uc81c\uc5b4 \uc2e0\ud638:<\/h4>\n<ul>\n<li>\ub9b4\ub808\uc774 IN \u2192 ESP32 GPIO \ud540 (\uc608: GPIO 23)<\/li>\n<\/ul>\n<h4>\ucf54\ub4dc \uc608\uc81c:<\/h4>\n<pre><code>const int relayPin = 23;  \/\/ ESP32 GPIO23<\/code><\/pre>\n<p>3.3V\uc5d0\uc11c \uc791\ub3d9\ud558\ub294 \uc774\uc720:<\/p>\n<p>ESP32 \ud540\uc774 LOW (0V)\ub85c \uac00\uba74 \uc811\uc9c0 \uacbd\ub85c\ub97c \uc81c\uacf5\ud569\ub2c8\ub2e4. \uc635\ud1a0\ucee4\ud50c\ub7ec\uc758 LED\ub294 5V VCC \uc804\uc6d0 \uacf5\uae09 \uc7a5\uce58\ub85c \uc804\uc6d0\uc774 \uacf5\uae09\ub418\ubbc0\ub85c \uc804\uccb4 5V \uc804\uc555 \uac15\ud558\uac00 LED\uc5d0\uc11c \ubc1c\uc0dd\ud558\uc5ec LED\ub97c \ucf1c\uace0 \ub9b4\ub808\uc774\ub97c \ud2b8\ub9ac\uac70\ud558\uae30\uc5d0 \ucda9\ubd84\ud569\ub2c8\ub2e4.<\/p>\n<p>\uc804\ubb38\uac00 \ud301: \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc5d0 VCC (\ub85c\uc9c1 \uc804\uc6d0)\uc640 \ubd84\ub9ac\ub41c JD-VCC (\ub9b4\ub808\uc774 \uc804\uc6d0)\uc6a9 \uc810\ud37c\uac00 \uc788\ub294 \uacbd\uc6b0 \uc810\ud37c\ub97c \uc81c\uac70\ud558\uace0 VCC\ub294 3.3V\ub85c \uc720\uc9c0\ud558\uba74\uc11c JD-VCC\uc5d0 5V\ub97c \uacf5\uae09\ud558\uc2ed\uc2dc\uc624. \uc774\ub807\uac8c \ud558\uba74 \uc644\uc804\ud55c \uc808\uc5f0\uc774 \uc81c\uacf5\ub418\uace0 3.3V \ub9c8\uc774\ud06c\ub85c\ucee8\ud2b8\ub864\ub7ec\uc5d0\uc11c \ub354 \ub098\uc740 \uc548\uc815\uc131\uc744 \uc81c\uacf5\ud569\ub2c8\ub2e4.<\/p>\n<h2>\ub85c\uc6b0 \ub808\ubca8 vs \ud558\uc774 \ub808\ubca8: \uc5b4\ub5a4 \uac83\uc744 \uc120\ud0dd\ud574\uc57c \ud560\uae4c\uc694?<\/h2>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-19561\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/High-Level-Trigger-Relay-Conceptual.webp\" alt=\"High Level Trigger Relay (Conceptual)\" width=\"800\" height=\"800\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/High-Level-Trigger-Relay-Conceptual.webp 800w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/High-Level-Trigger-Relay-Conceptual-300x300.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/High-Level-Trigger-Relay-Conceptual-150x150.webp 150w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/High-Level-Trigger-Relay-Conceptual-768x768.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/High-Level-Trigger-Relay-Conceptual-12x12.webp 12w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/High-Level-Trigger-Relay-Conceptual-600x600.webp 600w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/High-Level-Trigger-Relay-Conceptual-100x100.webp 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>\ub300\ubd80\ubd84\uc758 \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc5d0\ub294 \ub85c\uc6b0 \ub808\ubca8 \ubc0f \ud558\uc774 \ub808\ubca8 \ud2b8\ub9ac\uac70 \ubaa8\ub4dc \uc911\uc5d0\uc11c \uc120\ud0dd\ud560 \uc218 \uc788\ub294 \uc810\ud37c \ub610\ub294 \uc2a4\uc704\uce58\uac00 \ud568\uaed8 \uc81c\uacf5\ub429\ub2c8\ub2e4. \ub2e4\uc74c\uc740 \uac01 \ubaa8\ub4dc\ub97c \uc0ac\uc6a9\ud558\ub294 \uc2dc\uae30\uc785\ub2c8\ub2e4.<\/p>\n<h3>\ub2e4\uc74c \uacbd\uc6b0 \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70\ub97c \uc120\ud0dd\ud558\uc2ed\uc2dc\uc624.<\/h3>\n<ul>\n<li>\u2705 3.3V \ub9c8\uc774\ud06c\ub85c\ucee8\ud2b8\ub864\ub7ec (ESP32, ESP8266, Raspberry Pi) \uc0ac\uc6a9<\/li>\n<li>\u2705 \uc7a5\uc560 \uc548\uc804 \ub3d9\uc791\uc744 \uc6d0\ud558\ub294 \uacbd\uc6b0 (\uc81c\uc5b4\uc120\uc774 \uace0\uc7a5\ub098\uba74 \ub9b4\ub808\uc774\uac00 \uae30\ubcf8\uc801\uc73c\ub85c OFF\ub428)<\/li>\n<li>\u2705 \uc54c \uc218 \uc5c6\uac70\ub098 \ud14c\uc2a4\ud2b8\ub418\uc9c0 \uc54a\uc740 \ub9b4\ub808\uc774 \ubaa8\ub4c8\ub85c \uc791\uc5c5\ud558\ub294 \uacbd\uc6b0 (\ub354 \uc77c\ubc18\uc801\/\ud638\ud658 \uac00\ub2a5\ud55c \ubaa8\ub4dc\uc784)<\/li>\n<li>\u2705 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c \ubd80\ud558\uac00 \ub300\ubd80\ubd84 OFF \uc0c1\ud0dc\uc5ec\uc57c \ud558\ub294 \uacbd\uc6b0<\/li>\n<li>\u2705 \ucd08\ubcf4\uc790\uc778 \uacbd\uc6b0 (\ud638\ud658\uc131 \ubb38\uc81c\uac00 \ubc1c\uc0dd\ud560 \uac00\ub2a5\uc131\uc774 \uc801\uc74c)<\/li>\n<\/ul>\n<h4>\uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc608\uc2dc:<\/h4>\n<ul>\n<li>\ud648 \uc790\ub3d9\ud654 (\uae30\ubcf8\uc801\uc73c\ub85c \uc870\uba85 OFF)<\/li>\n<li>\uacbd\ubcf4 \uc2dc\uc2a4\ud15c (\uae30\ubcf8\uc801\uc73c\ub85c \uc0ac\uc774\ub80c OFF)<\/li>\n<li>\ud38c\ud504 \uc81c\uc5b4 (\uc801\uadf9\uc801\uc73c\ub85c \ud2b8\ub9ac\uac70\ub418\uc9c0 \uc54a\ub294 \ud55c \ud38c\ud504 OFF)<\/li>\n<li>\uc548\uc804 \uc778\ud130\ub85d (\uc801\uadf9\uc801\uc73c\ub85c \ud65c\uc131\ud654\ub418\uc9c0 \uc54a\ub294 \ud55c \uc7a5\ube44 \ube44\ud65c\uc131\ud654)<\/li>\n<\/ul>\n<h3>\ub2e4\uc74c \uacbd\uc6b0 \ud558\uc774 \ub808\ubca8 \ud2b8\ub9ac\uac70\ub97c \uc120\ud0dd\ud558\uc2ed\uc2dc\uc624.<\/h3>\n<ul>\n<li>\u2705 Arduino \uc7ac\uc124\uc815\/\ubd80\ud305 \uc911\uc5d0 \ub9b4\ub808\uc774\uac00 ON \uc0c1\ud0dc\uc5ec\uc57c \ud558\ub294 \uacbd\uc6b0 (\ub4dc\ubb3c\uc9c0\ub9cc \ud2b9\uc815 \uc0ac\uc6a9 \uc0ac\ub840)<\/li>\n<li>\u2705 \uc5ed \ub3d9\uc791\uc744 \uc6d0\ud558\ub294 \uc0c1\uc2dc \ud3d0\uc1c4 (NC) \ubd80\ud558\ub85c \uc791\uc5c5\ud558\ub294 \uacbd\uc6b0<\/li>\n<li>\u2705 \ucf54\ub4dc \ub85c\uc9c1\uc774 \u201cHIGH = ON\u201d\uc73c\ub85c \ub354 \uac04\ub2e8\ud55c \uacbd\uc6b0 (\uac1c\uc778 \ucde8\ud5a5)<\/li>\n<li>\u2705 \uc561\ud2f0\ube0c \ud558\uc774 \uc81c\uc5b4 \uc2dc\uc2a4\ud15c (PLC, \uc0b0\uc5c5\uc6a9 \ucee8\ud2b8\ub864\ub7ec)\uacfc \uc778\ud130\ud398\uc774\uc2a4\ud558\ub294 \uacbd\uc6b0<\/li>\n<\/ul>\n<h4>\uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc608\uc2dc:<\/h4>\n<ul>\n<li>\ube44\uc0c1 \uc870\uba85 (\uc815\uc804 \uc2dc ON \uc0c1\ud0dc \uc720\uc9c0)<\/li>\n<li>\ub0c9\uac01 \ud32c (\uc548\uc804\uc744 \uc704\ud574 \uae30\ubcf8\uc801\uc73c\ub85c ON)<\/li>\n<li>\ubc30\ud130\ub9ac \ubd84\ub9ac \uc2dc\uc2a4\ud15c (\ud2b9\uc815 \uc7a5\uc560 \uc548\uc804 \uc694\uad6c \uc0ac\ud56d)<\/li>\n<\/ul>\n<h2>\uc194\uc9c1\ud55c \uc9c4\uc2e4: Arduino\/ESP32 \ud504\ub85c\uc81d\ud2b8\uc758 95%\uc758 \uacbd\uc6b0 \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70\uac00 \ub354 \ub098\uc740 \uc120\ud0dd\uc785\ub2c8\ub2e4.<\/h2>\n<p>\ub354 \ud638\ud658\uc131\uc774 \ub192\uace0 \uc548\uc815\uc801\uc774\uba70 \uc548\uc804\ud569\ub2c8\ub2e4. \ub108\ubb34 \uae4a\uc774 \uc0dd\uac01\ud558\uc9c0 \ub9c8\uc2ed\uc2dc\uc624.<\/p>\n<h2>\uc77c\ubc18\uc801\uc778 \uc2e4\uc218 \ubc0f \ud574\uacb0 \ubc29\ubc95<\/h2>\n<h3>\uc2e4\uc218 1: \u201c\ub9b4\ub808\uc774\uac00 \ud56d\uc0c1 ON \uc0c1\ud0dc\uc785\ub2c8\ub2e4!\u201d<\/h3>\n<p>\uc99d\uc0c1: \ucf54\ub4dc\uac00 \uc2e4\ud589\ub418\uae30 \uc804\uc5d0\ub3c4 Arduino \uc804\uc6d0\uc744 \ucf1c\uc790\ub9c8\uc790 \ub9b4\ub808\uc774\uac00 ON\uc73c\ub85c \ud074\ub9ad\ub429\ub2c8\ub2e4.<\/p>\n<p>\uc6d0\uc778: \ubd80\ud305 \uc911 Arduino \ud540\uc740 \uc815\uc758\ub418\uc9c0 \uc54a\uc740 (\ud50c\ub85c\ud305) \uc0c1\ud0dc\uc5d0 \uc788\uc2b5\ub2c8\ub2e4. \ud540\uc774 LOW\ub85c \ud50c\ub85c\ud305\ub418\uba74 \ub9b4\ub808\uc774\uac00 \ud2b8\ub9ac\uac70\ub429\ub2c8\ub2e4.<\/p>\n<h4>Fix:<\/h4>\n<pre><code>void setup() {<\/code><\/pre>\n<p>OUTPUT\uc73c\ub85c \uc124\uc815\ud558\uae30 \uc804\uc5d0 \ud540 \uc0c1\ud0dc\ub97c \uc124\uc815\ud558\uba74 OFF \uc0c1\ud0dc\ub85c \uc2dc\uc791\ub429\ub2c8\ub2e4.<\/p>\n<h3>\uc2e4\uc218 2: \u201c\uc791\ub3d9\ud558\uc9c0\ub9cc... \ubb34\uc791\uc704\ub85c \ud2b8\ub9ac\uac70\ub429\ub2c8\ub2e4.\u201d<\/h3>\n<p>\uc99d\uc0c1: \ud2b9\ud788 \uae34 \uc804\uc120\uc774\ub098 \uc7a1\uc74c\uc774 \ub9ce\uc740 \ud658\uacbd\uc5d0\uc11c \ub9b4\ub808\uc774\uac00 \uc791\ub3d9\ud558\uc9c0 \uc54a\uc544\uc57c \ud560 \ub54c \uac00\ub054 ON\uc73c\ub85c \ud074\ub9ad\ub429\ub2c8\ub2e4.<\/p>\n<p>\uc6d0\uc778: \uc804\uae30\uc801 \uc7a1\uc74c \ub610\ub294 \ud50c\ub85c\ud305 \ud540 \uc0c1\ud0dc.<\/p>\n<h4>\ud574\uacb0 \ubc29\ubc95 1 \u2013 \uc678\ubd80 \ud480\uc5c5 \uc800\ud56d \ucd94\uac00:<\/h4>\n<p>IN \ud540\uacfc VCC \uc0ac\uc774\uc5d0 10k\u03a9 \uc800\ud56d\uc744 \uc5f0\uacb0\ud569\ub2c8\ub2e4. \uc774\ub807\uac8c \ud558\uba74 Arduino\uac00 \uc801\uadf9\uc801\uc73c\ub85c LOW\ub85c \ub2f9\uae30\uc9c0 \uc54a\uc744 \ub54c IN\uc774 HIGH (\ub9b4\ub808\uc774 OFF)\ub85c \uc720\uc9c0\ub429\ub2c8\ub2e4.<\/p>\n<h4>\ud574\uacb0 \ubc29\ubc95 2 \u2013 \ub0b4\ubd80 \ud480\uc5c5 \ud65c\uc131\ud654:<\/h4>\n<pre><code>void setup() {<\/code><\/pre>\n<h3>\uc2e4\uc218 3: \u201cESP32 \ub9b4\ub808\uc774\uac00 \uc77c\uad00\ub418\uac8c \ud074\ub9ad\ub418\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.\u201d<\/h3>\n<p>\uc99d\uc0c1: \ub9b4\ub808\uc774\uac00 \ub54c\ub85c\ub294 \uc791\ub3d9\ud558\uace0 \ub54c\ub85c\ub294 \uc2e4\ud328\ud569\ub2c8\ub2e4. \ub9b4\ub808\uc774 \ubcf4\ub4dc\uc758 LED\uac00 \ucf1c\uc9c0\uc9c0\ub9cc \ub9b4\ub808\uc774\uac00 \ud074\ub9ad\ub418\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n<p>\uc6d0\uc778: 3.3V GPIO\uc5d0\uc11c \uc635\ud1a0\ucee4\ud50c\ub7ec LED\ub97c \uc548\uc815\uc801\uc73c\ub85c \uad6c\ub3d9\ud558\uae30\uc5d0 \ucda9\ubd84\ud55c \uc804\ub958\uac00 \uc5c6\uc2b5\ub2c8\ub2e4.<\/p>\n<h4>\ud574\uacb0 \ubc29\ubc95 \u2013 \uc804\uc6a9 3.3V \ub9b4\ub808\uc774 \ubaa8\ub4c8 \uc0ac\uc6a9:<\/h4>\n<p>3.3V \ud2b8\ub9ac\uac70 \uc804\uc555\uc5d0 \ub300\ud574 \ud2b9\ubcc4\ud788 \uc815\uaca9\ub41c \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc744 \ucc3e\uc73c\uc2ed\uc2dc\uc624 (\ub2e8\uc21c\ud788 3.3V \ud638\ud658\uc774 \uc544\ub2cc). \uc774\ub7ec\ud55c \ubaa8\ub4c8\uc740 \ub354 \ub0ae\uc740 LED \uc21c\ubc29\ud5a5 \uc804\uc555 \uc694\uad6c \uc0ac\ud56d\uc73c\ub85c \ucd5c\uc801\ud654\ub41c \uc635\ud1a0\ucee4\ud50c\ub7ec \ud68c\ub85c\ub97c \uac00\uc9c0\uace0 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<p>\ub610\ub294 \u2013 \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc758 VCC\uc5d0 5V \uc804\uc6d0 \uacf5\uae09:<\/p>\n<p>ESP32\uac00 3.3V\uc774\ub354\ub77c\ub3c4 ESP32 GPIO\uac00 GND\ub85c \uc804\ub958\ub97c \uc2f1\ud06c\ud558\ub294 \ub3d9\uc548 \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc758 VCC\uc5d0 5V (ESP32\uc758 5V \ud540 \ub610\ub294 \uc678\ubd80 \uc804\uc6d0 \uacf5\uae09 \uc7a5\uce58)\ub97c \uacf5\uae09\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub807\uac8c \ud558\uba74 \uc635\ud1a0\ucee4\ud50c\ub7ec\ub97c \ud1b5\ud574 \ub354 \uac15\ub825\ud55c LED \uc804\ub958\uac00 \uc81c\uacf5\ub429\ub2c8\ub2e4.<\/p>\n<h3>\uc2e4\uc218 4: \u201c\uc810\ud37c\ub97c \uc798\ubabb \uc124\uc815\ud588\uc2b5\ub2c8\ub2e4.\u201d<\/h3>\n<p>\uc99d\uc0c1: \ub9b4\ub808\uc774 \ub3d9\uc791\uc774 \ucf54\ub4dc\uc5d0\uc11c \uc608\uc0c1\ud558\ub294 \uac83\uacfc \ubc18\ub300\uc785\ub2c8\ub2e4.<\/p>\n<p>\uc6d0\uc778: \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc5d0 \ud558\uc774 \ub808\ubca8 \ud2b8\ub9ac\uac70 \ubaa8\ub4dc\ub85c \uc124\uc815\ub41c \uc810\ud37c\uac00 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<h4>Fix:<\/h4>\n<p>\uc77c\ubc18\uc801\uc73c\ub85c \ub2e4\uc74c\uacfc \uac19\uc774 \ub808\uc774\ube14\uc774 \uc9c0\uc815\ub41c \uc2a4\ud06c\ub958 \ud130\ubbf8\ub110 \uadfc\ucc98\uc5d0\uc11c 3\ud540 \uc810\ud37c\ub97c \ucc3e\uc73c\uc2ed\uc2dc\uc624.<\/p>\n<ul>\n<li>H (High level trigger) - H (High level trigger)<\/li>\n<li>COM (Common) - COM (\uacf5\ud1b5)<\/li>\n<li>L (Low level trigger) - L (Low level trigger)<\/li>\n<\/ul>\n<p>Move the jumper to connect COM and L for low-level trigger mode. - \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70 \ubaa8\ub4dc\ub97c \uc704\ud574 \uc810\ud37c\ub97c \uc6c0\uc9c1\uc5ec COM\uacfc L\uc744 \uc5f0\uacb0\ud558\uc2ed\uc2dc\uc624.<\/p>\n<p>If No Jumper Exists: Some relay modules are fixed at low-level only. Check the product description or test: if LOW turns it ON, it\u2019s low-level trigger. - \uc810\ud37c\uac00 \uc5c6\ub294 \uacbd\uc6b0: \uc77c\ubd80 \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc740 \ub85c\uc6b0 \ub808\ubca8\ub85c\ub9cc \uace0\uc815\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4. \uc81c\ud488 \uc124\uba85\uc744 \ud655\uc778\ud558\uac70\ub098 \ud14c\uc2a4\ud2b8\ud558\uc2ed\uc2dc\uc624. LOW\uac00 \ucf1c\uc9c0\uba74 \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70\uc785\ub2c8\ub2e4.<\/p>\n<h3>Mistake #5: \u201cRelay Clicks But Load Doesn\u2019t Turn On\u201d - \uc2e4\uc218 #5: \"\ub9b4\ub808\uc774\ub294 \ub538\uae4d\uac70\ub9ac\uc9c0\ub9cc \ubd80\ud558\uac00 \ucf1c\uc9c0\uc9c0 \uc54a\uc74c\"<\/h3>\n<p>Symptom: You hear the relay click, LED lights up, but your lamp\/motor\/pump doesn\u2019t activate. - \uc99d\uc0c1: \ub9b4\ub808\uc774\uac00 \ub538\uae4d\uac70\ub9ac\ub294 \uc18c\ub9ac\uac00 \ub4e4\ub9ac\uace0 LED\uac00 \ucf1c\uc9c0\uc9c0\ub9cc \ub7a8\ud504\/\ubaa8\ud130\/\ud38c\ud504\uac00 \uc791\ub3d9\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n<p>Cause: This isn\u2019t a trigger problem\u2014it\u2019s a wiring problem on the high-voltage side. - \uc6d0\uc778: \uc774\uac83\uc740 \ud2b8\ub9ac\uac70 \ubb38\uc81c\uac00 \uc544\ub2c8\ub77c \uace0\uc804\uc555 \uce21\uc758 \ubc30\uc120 \ubb38\uc81c\uc785\ub2c8\ub2e4.<\/p>\n<h4>Fix \u2013 Check Load Wiring: - \ud574\uacb0 \ubc29\ubc95 \u2013 \ubd80\ud558 \ubc30\uc120 \ud655\uc778:<\/h4>\n<p>COM (Common) connects to power source (e.g., 12V+ or AC line) - COM (\uacf5\ud1b5)\uc740 \uc804\uc6d0 (\uc608: 12V+ \ub610\ub294 AC \ub77c\uc778)\uc5d0 \uc5f0\uacb0\ub429\ub2c8\ub2e4.<\/p>\n<p>NO (Normally Open) connects to load positive terminal - NO (Normally Open)\ub294 \ubd80\ud558 \uc591\uadf9 \ub2e8\uc790\uc5d0 \uc5f0\uacb0\ub429\ub2c8\ub2e4.<\/p>\n<p>Load negative goes back to power source negative - \ubd80\ud558 \uc74c\uadf9\uc740 \uc804\uc6d0 \uc74c\uadf9\uc73c\ub85c \ub3cc\uc544\uac11\ub2c8\ub2e4.<\/p>\n<h4>For AC loads (like a lamp): - AC \ubd80\ud558 (\uc608: \ub7a8\ud504)\uc758 \uacbd\uc6b0:<\/h4>\n<ul>\n<li>COM to AC hot wire - COM\uc744 AC \ud65c\uc120\uc5d0 \uc5f0\uacb0<\/li>\n<li>NO to lamp - NO\ub97c \ub7a8\ud504\uc5d0 \uc5f0\uacb0<\/li>\n<li>Lamp other terminal to AC neutral - \ub7a8\ud504\uc758 \ub2e4\ub978 \ub2e8\uc790\ub97c AC \uc911\uc131\uc120\uc5d0 \uc5f0\uacb0<\/li>\n<\/ul>\n<h3>\uc911\uc694 \uc548\uc804 \ucc38\uace0 \uc0ac\ud56d:<\/h3>\n<p>If working with AC mains voltage (110V\/220V), turn OFF power at the breaker before wiring. If you\u2019re not comfortable with AC wiring, use a qualified electrician. - AC \uc8fc\uc804\uc6d0 \uc804\uc555 (110V\/220V)\uc73c\ub85c \uc791\uc5c5\ud558\ub294 \uacbd\uc6b0 \ubc30\uc120\ud558\uae30 \uc804\uc5d0 \ucc28\ub2e8\uae30\uc5d0\uc11c \uc804\uc6d0\uc744 \ub044\uc2ed\uc2dc\uc624. AC \ubc30\uc120\uc5d0 \uc775\uc219\ud558\uc9c0 \uc54a\uc740 \uacbd\uc6b0 \uc790\uaca9\uc744 \uac16\ucd98 \uc804\uae30 \uae30\uc220\uc790\ub97c \uc0ac\uc6a9\ud558\uc2ed\uc2dc\uc624.<\/p>\n<h2>Practical Applications: When You Actually Need Low Level Trigger Relays - \uc2e4\uc81c \uc751\uc6a9 \ubd84\uc57c: \uc2e4\uc81c\ub85c \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70 \ub9b4\ub808\uc774\uac00 \ud544\uc694\ud55c \uacbd\uc6b0<\/h2>\n<h3>1. Home Automation Projects - 1. \ud648 \uc790\ub3d9\ud654 \ud504\ub85c\uc81d\ud2b8<\/h3>\n<p>Scenario: ESP32-controlled smart outlet for lamps. - \uc2dc\ub098\ub9ac\uc624: \ub7a8\ud504\uc6a9 ESP32 \uc81c\uc5b4 \uc2a4\ub9c8\ud2b8 \ucf58\uc13c\ud2b8.<\/p>\n<p>Why Low Level Trigger: - \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70\ub97c \uc0ac\uc6a9\ud558\ub294 \uc774\uc720:<\/p>\n<ul>\n<li>ESP32 is 3.3V (better compatibility) - ESP32\ub294 3.3V (\ub354 \ub098\uc740 \ud638\ud658\uc131)\uc785\ub2c8\ub2e4.<\/li>\n<li>Lamp should be OFF by default (fail-safe) - \ub7a8\ud504\ub294 \uae30\ubcf8\uc801\uc73c\ub85c \uaebc\uc838 \uc788\uc5b4\uc57c \ud569\ub2c8\ub2e4 (\uc548\uc804 \uc7a5\uce58).<\/li>\n<li>Random triggers during WiFi reconnects would be annoying - WiFi \uc7ac\uc5f0\uacb0 \uc911 \ubb34\uc791\uc704 \ud2b8\ub9ac\uac70\ub294 \uc131\uac00\uc2e4 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<\/ul>\n<h4>Implementation: - \uad6c\ud604:<\/h4>\n<pre><code>const int relayPin = 23;<\/code><\/pre>\n<h3>2. Garden Irrigation Controller - 2. \uc815\uc6d0 \uad00\uac1c \ucee8\ud2b8\ub864\ub7ec<\/h3>\n<p>Scenario: Arduino-timed water pump for garden beds. - \uc2dc\ub098\ub9ac\uc624: \uc815\uc6d0 \ubc2d\uc744 \uc704\ud55c \uc544\ub450\uc774\ub178 \ud0c0\uc774\uba38 \uc6cc\ud130 \ud38c\ud504.<\/p>\n<p>Why Low Level Trigger: - \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70\ub97c \uc0ac\uc6a9\ud558\ub294 \uc774\uc720:<\/p>\n<ul>\n<li>Pump OFF by default (prevents flooding if Arduino crashes) - \ud38c\ud504\ub294 \uae30\ubcf8\uc801\uc73c\ub85c \uaebc\uc838 \uc788\uc2b5\ub2c8\ub2e4 (\uc544\ub450\uc774\ub178 \ucda9\ub3cc \uc2dc \uce68\uc218 \ubc29\uc9c0).<\/li>\n<li>Long wires to outdoor relay (noise immunity with pull-up) - \uc2e4\uc678 \ub9b4\ub808\uc774\ub85c \uc5f0\uacb0\ub418\ub294 \uae34 \uc804\uc120 (\ud480\uc5c5\uc744 \ud1b5\ud55c \ub178\uc774\uc988 \ub0b4\uc131).<\/li>\n<li>Fail-safe: broken wire = no water = plant survive - \uc548\uc804 \uc7a5\uce58: \uc804\uc120 \ub04a\uc5b4\uc9d0 = \ubb3c \uc5c6\uc74c = \uc2dd\ubb3c \uc0dd\uc874<\/li>\n<\/ul>\n<h4>Implementation: - \uad6c\ud604:<\/h4>\n<pre><code>void waterGarden(int minutes) {<\/code><\/pre>\n<h3>3. 3D Printer Power Management - 3. 3D \ud504\ub9b0\ud130 \uc804\uc6d0 \uad00\ub9ac<\/h3>\n<p>Scenario: Automatically power printer ON before print jobs, OFF when complete. - \uc2dc\ub098\ub9ac\uc624: \uc778\uc1c4 \uc791\uc5c5 \uc804\uc5d0 \uc790\ub3d9\uc73c\ub85c \ud504\ub9b0\ud130 \uc804\uc6d0\uc744 \ucf1c\uace0 \uc644\ub8cc\ub418\uba74 \ub055\ub2c8\ub2e4.<\/p>\n<p>Why Low Level Trigger: - \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70\ub97c \uc0ac\uc6a9\ud558\ub294 \uc774\uc720:<\/p>\n<ul>\n<li>Printer OFF when not printing (saves power, reduces fire risk) - \uc778\uc1c4\ud558\uc9c0 \uc54a\uc744 \ub54c\ub294 \ud504\ub9b0\ud130 \uc804\uc6d0\uc744 \ub055\ub2c8\ub2e4 (\uc804\ub825 \uc808\uc57d, \ud654\uc7ac \uc704\ud5d8 \uac10\uc18c).<\/li>\n<li>OctoPrint (Raspberry Pi) uses 3.3V GPIO - OctoPrint (Raspberry Pi)\ub294 3.3V GPIO\ub97c \uc0ac\uc6a9\ud569\ub2c8\ub2e4.<\/li>\n<li>Fail-safe: system crash = printer stays OFF - \uc548\uc804 \uc7a5\uce58: \uc2dc\uc2a4\ud15c \ucda9\ub3cc = \ud504\ub9b0\ud130\uac00 \uaebc\uc9c4 \uc0c1\ud0dc\ub85c \uc720\uc9c0\ub429\ub2c8\ub2e4.<\/li>\n<\/ul>\n<h3>4. Aquarium Controller - 4. \uc218\uc871\uad00 \ucee8\ud2b8\ub864\ub7ec<\/h3>\n<p>Scenario: Temperature-based heater control with Arduino. - \uc2dc\ub098\ub9ac\uc624: \uc544\ub450\uc774\ub178\ub97c \uc0ac\uc6a9\ud55c \uc628\ub3c4 \uae30\ubc18 \ud788\ud130 \uc81c\uc5b4.<\/p>\n<p>Why Low Level Trigger: - \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70\ub97c \uc0ac\uc6a9\ud558\ub294 \uc774\uc720:<\/p>\n<ul>\n<li>Heater OFF by default (prevents overheating fish if sensor fails) - \ud788\ud130\ub294 \uae30\ubcf8\uc801\uc73c\ub85c \uaebc\uc838 \uc788\uc2b5\ub2c8\ub2e4 (\uc13c\uc11c \uace0\uc7a5 \uc2dc \ubb3c\uace0\uae30 \uacfc\uc5f4 \ubc29\uc9c0).<\/li>\n<li>5V Arduino or 3.3V ESP32 compatibility - 5V \uc544\ub450\uc774\ub178 \ub610\ub294 3.3V ESP32 \ud638\ud658\uc131<\/li>\n<li>Multiple relays (lights, filter, heater) all need coordinated fail-safe behavior - \uc5ec\ub7ec \ub9b4\ub808\uc774 (\uc870\uba85, \ud544\ud130, \ud788\ud130)\ub294 \ubaa8\ub450 \uc870\uc815\ub41c \uc548\uc804 \uc7a5\uce58 \ub3d9\uc791\uc774 \ud544\uc694\ud569\ub2c8\ub2e4.<\/li>\n<\/ul>\n<h2>What This Means for Your Next Project - \uc774\uac83\uc774 \ub2e4\uc74c \ud504\ub85c\uc81d\ud2b8\uc5d0 \uc758\ubbf8\ud558\ub294 \uac83<\/h2>\n<p>Low level trigger relays aren\u2019t weird\u2014they\u2019re the standard. Once you internalize the logic (\u201cLOW = ON, HIGH = OFF\u201d), they become second nature. And the benefits\u2014fail-safe behavior, better compatibility, noise immunity\u2014make them the smart choice for most Arduino and ESP32 projects. - \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70 \ub9b4\ub808\uc774\ub294 \uc774\uc0c1\ud55c \uac83\uc774 \uc544\ub2c8\ub77c \ud45c\uc900\uc785\ub2c8\ub2e4. \"LOW = ON, HIGH = OFF\" \ub17c\ub9ac\ub97c \ub0b4\uba74\ud654\ud558\uba74 \uc81c2\uc758 \ucc9c\uc131\uc774 \ub429\ub2c8\ub2e4. \uadf8\ub9ac\uace0 \uc548\uc804 \uc7a5\uce58 \ub3d9\uc791, \ub354 \ub098\uc740 \ud638\ud658\uc131, \ub178\uc774\uc988 \ub0b4\uc131\uacfc \uac19\uc740 \uc774\uc810\uc740 \ub300\ubd80\ubd84\uc758 \uc544\ub450\uc774\ub178 \ubc0f ESP32 \ud504\ub85c\uc81d\ud2b8\uc5d0 \ub300\ud55c \ud604\uba85\ud55c \uc120\ud0dd\uc774 \ub429\ub2c8\ub2e4.<\/p>\n<h3>Quick Decision Guide: - \ube60\ub978 \uc758\uc0ac \uacb0\uc815 \uac00\uc774\ub4dc:<\/h3>\n<h4>Use Low Level Trigger Relay If: - \ub2e4\uc74c\uacfc \uac19\uc740 \uacbd\uc6b0 \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70 \ub9b4\ub808\uc774\ub97c \uc0ac\uc6a9\ud558\uc2ed\uc2dc\uc624.<\/h4>\n<ul>\n<li>\u2705 You\u2019re using ESP32, ESP8266, or any 3.3V microcontroller - \u2705 ESP32, ESP8266 \ub610\ub294 3.3V \ub9c8\uc774\ud06c\ub85c\ucee8\ud2b8\ub864\ub7ec\ub97c \uc0ac\uc6a9\ud558\ub294 \uacbd\uc6b0<\/li>\n<li>\u2705 Your load should be OFF by default (pumps, heaters, alarms) - \u2705 \ubd80\ud558\uac00 \uae30\ubcf8\uc801\uc73c\ub85c \uaebc\uc838 \uc788\uc5b4\uc57c \ud558\ub294 \uacbd\uc6b0 (\ud38c\ud504, \ud788\ud130, \uacbd\ubcf4)<\/li>\n<li>\u2705 You want fail-safe behavior (wire break = relay OFF) - \u2705 \uc548\uc804 \uc7a5\uce58 \ub3d9\uc791\uc744 \uc6d0\ud558\ub294 \uacbd\uc6b0 (\uc804\uc120 \ub04a\uc5b4\uc9d0 = \ub9b4\ub808\uc774 OFF)<\/li>\n<li>\u2705 You\u2019re building a beginner project - \u2705 \ucd08\ubcf4\uc790 \ud504\ub85c\uc81d\ud2b8\ub97c \uad6c\ucd95\ud558\ub294 \uacbd\uc6b0<\/li>\n<li>\u2705 You value compatibility over fighting with logic levels - \u2705 \ub17c\ub9ac \ub808\ubca8\uacfc\uc758 \uc2f8\uc6c0\ubcf4\ub2e4 \ud638\ud658\uc131\uc744 \uc911\uc694\ud558\uac8c \uc0dd\uac01\ud558\ub294 \uacbd\uc6b0<\/li>\n<\/ul>\n<h4>Use High Level Trigger Relay If: - \ub2e4\uc74c\uacfc \uac19\uc740 \uacbd\uc6b0 \ud558\uc774 \ub808\ubca8 \ud2b8\ub9ac\uac70 \ub9b4\ub808\uc774\ub97c \uc0ac\uc6a9\ud558\uc2ed\uc2dc\uc624.<\/h4>\n<ul>\n<li>\u2705 Your specific application requires relay ON during microcontroller boot - \u2705 \ud2b9\uc815 \uc751\uc6a9 \ud504\ub85c\uadf8\ub7a8\uc5d0\uc11c \ub9c8\uc774\ud06c\ub85c\ucee8\ud2b8\ub864\ub7ec \ubd80\ud305 \uc911\uc5d0 \ub9b4\ub808\uc774 ON\uc774 \ud544\uc694\ud55c \uacbd\uc6b0<\/li>\n<li>\u2705 You\u2019re interfacing with industrial control systems (PLCs) - \u2705 \uc0b0\uc5c5 \uc81c\uc5b4 \uc2dc\uc2a4\ud15c (PLC)\uacfc \uc778\ud130\ud398\uc774\uc2a4\ud558\ub294 \uacbd\uc6b0<\/li>\n<li>\u2705 You have a very specific reason (and you know what it is) - \u2705 \ub9e4\uc6b0 \uad6c\uccb4\uc801\uc778 \uc774\uc720\uac00 \uc788\ub294 \uacbd\uc6b0 (\uadf8\ub9ac\uace0 \uadf8 \uc774\uc720\ub97c \uc54c\uace0 \uc788\ub294 \uacbd\uc6b0)<\/li>\n<\/ul>\n<h2>\uc804\ubb38\uac00 \ud301:<\/h2>\n<p>When buying relay modules, look for ones that support both high and low level triggering with a jumper. This gives you flexibility to choose the best mode for each project. - \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc744 \uad6c\ub9e4\ud560 \ub54c\ub294 \uc810\ud37c\ub85c \ud558\uc774 \ub808\ubca8 \ubc0f \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70\ub97c \ubaa8\ub450 \uc9c0\uc6d0\ud558\ub294 \uac83\uc744 \ucc3e\uc73c\uc2ed\uc2dc\uc624. \uc774\ub807\uac8c \ud558\uba74 \uac01 \ud504\ub85c\uc81d\ud2b8\uc5d0 \uac00\uc7a5 \uc801\ud569\ud55c \ubaa8\ub4dc\ub97c \uc120\ud0dd\ud560 \uc218 \uc788\ub294 \uc720\uc5f0\uc131\uc774 \uc81c\uacf5\ub429\ub2c8\ub2e4.<\/p>\n<h2>Choosing the Right Relay Module - \uc62c\ubc14\ub978 \ub9b4\ub808\uc774 \ubaa8\ub4c8 \uc120\ud0dd<\/h2>\n<p>When shopping for relay modules, here\u2019s what to check: - \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc744 \uc1fc\ud551\ud560 \ub54c \ud655\uc778\ud574\uc57c \ud560 \uc0ac\ud56d\uc740 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n<h3>For Arduino Uno \/ Mega (5V): - Arduino Uno \/ Mega (5V)\uc758 \uacbd\uc6b0:<\/h3>\n<ul>\n<li>Operating voltage: 5V DC - \uc791\ub3d9 \uc804\uc555: 5V DC<\/li>\n<li>Trigger voltage: 5V compatible - \ud2b8\ub9ac\uac70 \uc804\uc555: 5V \ud638\ud658<\/li>\n<li>Trigger current: &lt;15mA (Arduino pins source max 20-40mA) - \ud2b8\ub9ac\uac70 \uc804\ub958: &lt;15mA (\uc544\ub450\uc774\ub178 \ud540 \uc18c\uc2a4 \ucd5c\ub300 20-40mA)<\/li>\n<li>Optocoupler isolation: Yes (PC817 or similar) - \uad11 \ucee4\ud50c\ub7ec \uc808\uc5f0: \uc608 (PC817 \ub610\ub294 \uc720\uc0ac)<\/li>\n<\/ul>\n<h3>For ESP32 \/ ESP8266 (3.3V): - ESP32 \/ ESP8266 (3.3V)\uc758 \uacbd\uc6b0:<\/h3>\n<ul>\n<li>\uc791\ub3d9 \uc804\uc555: 5V DC (\ub9b4\ub808\uc774 \ucf54\uc77c \uc804\uc6d0\uc6a9)<\/li>\n<li>\ud2b8\ub9ac\uac70 \uc804\uc555: 3.3V \ud638\ud658 \ub610\ub294 \ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70 \ubaa8\ub4dc<\/li>\n<li>\ud2b8\ub9ac\uac70 \uc804\ub958: &lt;12mA (ESP32 \ud540 \uc18c\uc2a4 \ucd5c\ub300 12mA)<\/li>\n<li>\uad11\ucee4\ud50c\ub7ec \uc808\uc5f0: \ud544\uc218<\/li>\n<li>\ubd84\ub9ac\ub41c VCC\/JD-VCC: \uad8c\uc7a5<\/li>\n<\/ul>\n<h3>\uc77c\ubc18 \uc0ac\uc591:<\/h3>\n<ul>\n<li>\uc811\uc810 \uc815\uaca9: 10A @ 250VAC \ub610\ub294 10A @ 30VDC (\uc77c\ubc18)<\/li>\n<li>\ucc44\ub110 \uc218: 1, 2, 4, 8 (\ud544\uc694\uc5d0 \ub530\ub77c)<\/li>\n<li>\uc7a5\ucc29: \uc26c\uc6b4 \ubc30\uc120\uc744 \uc704\ud55c \uc2a4\ud06c\ub958 \ud130\ubbf8\ub110<\/li>\n<li>\ud45c\uc2dc\ub4f1: \uc804\uc6d0 \ubc0f \ub9b4\ub808\uc774 \uc0c1\ud0dc LED<\/li>\n<\/ul>\n<p>VIOX Electric\uc740 Arduino, ESP32 \ubc0f \uc0b0\uc5c5 \uc81c\uc5b4 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0 \ucd5c\uc801\ud654\ub41c \uc644\ubcbd\ud55c \ubc94\uc704\uc758 \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc744 \uc81c\uacf5\ud569\ub2c8\ub2e4. \ub2f9\uc0ac\uc758 \ub9b4\ub808\uc774 \ubaa8\ub4c8\uc740 \ub2e4\uc74c\uc744 \ud2b9\uc9d5\uc73c\ub85c \ud569\ub2c8\ub2e4.<\/p>\n<ul>\n<li>\ub85c\uc6b0 \ub808\ubca8 \ud2b8\ub9ac\uac70 \uc124\uacc4\ub97c \ud1b5\ud55c \uc9c4\uc815\ud55c 3.3V\/5V \ud638\ud658\uc131<\/li>\n<li>\uace0\ud488\uc9c8 \uad11\ucee4\ud50c\ub7ec \uc808\uc5f0 (PC817)<\/li>\n<li>\uc548\uc804\ud55c \ubc30\uc120\uc744 \uc704\ud55c \uc2a4\ud06c\ub958 \ud130\ubbf8\ub110 \uc5f0\uacb0<\/li>\n<li>\uc774\uc911 LED \ud45c\uc2dc\ub4f1 (\uc804\uc6d0 + \ub9b4\ub808\uc774 \uc0c1\ud0dc)<\/li>\n<li>\uc120\ud0dd \uac00\ub2a5\ud55c \ud2b8\ub9ac\uac70 \ubaa8\ub4dc (\ud558\uc774\/\ub85c\uc6b0 \ub808\ubca8 \uc810\ud37c)<\/li>\n<\/ul>\n<p>VIOX \ub9b4\ub808\uc774 \ubaa8\ub4c8 \ucc3e\uc544\ubcf4\uae30 \u2192 \ub610\ub294 \ud2b9\uc815 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uad8c\uc7a5 \uc0ac\ud56d\uc740 \uae30\uc220 \ud300\uc5d0 \ubb38\uc758\ud558\uc2ed\uc2dc\uc624.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Introduction: The Click That Never Came 2:47 AM. You&#8217;ve been at this for three hours. Your Arduino project looks perfect. The relay module sits there on your breadboard, wired exactly like the tutorial showed. You&#8217;ve triple-checked: VCC to 5V, GND to GND, IN1 to digital pin 7. The code compiles. You upload it. Pin 7 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":19565,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-19558","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/test.viox.com\/ko\/wp-json\/wp\/v2\/posts\/19558","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/test.viox.com\/ko\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/test.viox.com\/ko\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/test.viox.com\/ko\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/test.viox.com\/ko\/wp-json\/wp\/v2\/comments?post=19558"}],"version-history":[{"count":4,"href":"https:\/\/test.viox.com\/ko\/wp-json\/wp\/v2\/posts\/19558\/revisions"}],"predecessor-version":[{"id":19566,"href":"https:\/\/test.viox.com\/ko\/wp-json\/wp\/v2\/posts\/19558\/revisions\/19566"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/ko\/wp-json\/wp\/v2\/media\/19565"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/ko\/wp-json\/wp\/v2\/media?parent=19558"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/ko\/wp-json\/wp\/v2\/categories?post=19558"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/ko\/wp-json\/wp\/v2\/tags?post=19558"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}