{"product_id":"4-channel-relay-opto-isolated-input-board-compoden","title":"4-Channel Relay \u0026 Opto-Isolated Input Board – Compoden","description":"\u003ch1\u003e4 Channel Relay \u0026amp; Opto-Isolated Input Board\u003c\/h1\u003e\n\u003cp\u003eThis board integrates four 10A SPDT relays and four independent opto-isolated digital inputs on a single PCB. It safely links low‑voltage microcontrollers to high‑power AC or DC devices while the optocouplers protect your controller from ground loops and voltage spikes. Ideal for appliance control, machine sensing, and automation projects.\u003c\/p\u003e\n\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\u003eRelay Channels\u003c\/td\u003e\n\u003ctd\u003e4 (each SPDT – NO, COM, NC)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRelay Coil Voltage\u003c\/td\u003e\n\u003ctd\u003e5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Switching Load\u003c\/td\u003e\n\u003ctd\u003e10A @ 250VAC \/ 10A @ 30VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOpto‑Isolated Input Channels\u003c\/td\u003e\n\u003ctd\u003e4 (on‑board LED indicators)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInput Signal Voltage\u003c\/td\u003e\n\u003ctd\u003e3V – 24V DC (optocoupler active)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eHome appliance scheduler – turn lights, fans, or heaters on\/off from a smartphone\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/greenhouse-soil-moisture-sensor-kit-with-arduino-nano-solar-charged\"\u003eAutomated greenhouse – control water pumps and read soil‑moisture sensors simultaneously\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 limit‑switch feedback for fully automatic operation\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-industrial-machine-monitor\"\u003eIndustrial status panel – monitor machine sensors (proximity, push‑buttons) and trigger alarms or relays\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eDesigned for any 3.3V or 5V controller pin – works directly with Arduino Nano, Uno,\n\u003c\/p\u003e\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":53445084152173,"sku":"CDN-0014","price":520.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_608a4a7c-ddda-4210-a8de-202806439396.jpg?v=1781513214","url":"https:\/\/compoden.com\/products\/4-channel-relay-opto-isolated-input-board-compoden","provider":"Compoden","version":"1.0","type":"link"}