{"product_id":"4-channel-relay-board-for-38-pin-esp32-5v-module-compoden","title":"4 Channel Relay Board for 38-Pin ESP32 5V Module | Compoden","description":"\u003ch1\u003e4-Channel Relay Board for 38-Pin ESP32 — 5V, 10A Load Switching\u003c\/h1\u003e\n\u003cp\u003eThe 4 Channel Relay Board is designed to interface directly with 38-pin ESP32 development boards using 5V logic. It provides four independent relays capable of switching up to 10A at 250VAC, allowing you to control high-power devices from your ESP32 projects. Ideal for home automation, appliance control, and IoT prototyping.\u003c\/p\u003e\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eNumber of Channels\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRelay Type\u003c\/td\u003e\n\u003ctd\u003eSRD-05VDC or equivalent\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eControl Voltage\u003c\/td\u003e\n\u003ctd\u003e5V DC (coil)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaximum Switching Load\u003c\/td\u003e\n\u003ctd\u003e10A 250VAC, 10A 30VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003eOptocoupler per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBoard Dimensions\u003c\/td\u003e\n\u003ctd\u003eApprox. 75 x 55 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eWi-Fi-controlled home appliance switch using ESP32 with Blynk or ESPHome.\u003c\/li\u003e\n  \u003cli\u003eSmart plug for lamps, fans, or heaters with scheduling via MQTT.\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-automated-irrigation-system\"\u003eAutomated irrigation system controlling solenoid valves.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/esp32-garage-door-opener-kit-auto-open-and-close-via-phone-ble\"\u003eGarage door opener with RFID or smartphone control.\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis board is designed for the 38-pin ESP32 module, connecting directly to its GPIO headers. It can also be used with other 3.3V\/5V microcontrollers such as Arduino Uno or Raspberry Pi GPIOS using jumper wires, but note that the relay coils require a 5V power supply irrespective of the controller's logic level.\u003c\/p\u003e\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect the board's 5V and GND pins to a stable external 5V supply capable of at least 500mA for all relays. The relay inputs are active LOW; set the corresponding ESP32 GPIO pin to LOW to energize the relay. Do not exceed the GPIO sink current limits—the onboard optocouplers handle the coil drive.\u003c\/p\u003e\n\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\n\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino Uno?\u003c\/summary\u003e\u003cp\u003eYes, it can be used with Arduino Uno by connecting the relay input pins to digital outputs and providing a separate 5V supply for the board. The pinout does not plug directly into Arduino headers, so jumper wires are required.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the maximum load each relay can switch?\u003c\/summary\u003e\u003cp\u003eEach relay is rated for up to 10A at 250VAC or 10A at 30VDC. Always verify your load current does not exceed this limit to prevent contact welding or overheating.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDo I need an external power supply for the relay board?\u003c\/summary\u003e\u003cp\u003eYes, the relay coils require 5V and the ESP32's onboard 5V regulator cannot supply enough current for all four relays. A separate 5V supply (e.g., phone charger) must be connected to the board's power input.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53444944888173,"sku":"CDN-0013","price":390.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_a7e73194-476e-43f7-9374-50c556bd580d.jpg?v=1781512083","url":"https:\/\/compoden.com\/products\/4-channel-relay-board-for-38-pin-esp32-5v-module-compoden","provider":"Compoden","version":"1.0","type":"link"}