{"product_id":"4-channel-esp8266-wifi-relay-module-diy-smart-switch","title":"4-Channel ESP8266 WiFi Relay Module – DIY Smart Switch","description":"\n\u003ch2\u003e4-Channel ESP8266-12F WiFi Relay Module – DIY Smart Home Control Board\u003c\/h2\u003e\n\u003cp\u003eTake full control of your home automation projects with this \u003cstrong\u003e4-Way ESP8266-12F WiFi Relay Module\u003c\/strong\u003e. Designed for makers, developers, and DIY enthusiasts, this development board lets you independently program and customize your own remote-control switch system — no off-the-shelf limitations. Control lights, fans, electric blankets, and other household appliances wirelessly over your local network or the internet.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4 Independent Relay Channels\u003c\/strong\u003e — Switch up to four appliances or circuits simultaneously\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eESP8266-12F WiFi Core\u003c\/strong\u003e — Industry-proven 2.4GHz WiFi module for reliable wireless connectivity\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Power Support\u003c\/strong\u003e — Works with both 220V AC and 12V DC power inputs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMultiple Communication Protocols\u003c\/strong\u003e — Pre-loaded with TCPServer, TCPClient, HTTP_GET, MQTT, and Bafa Cloud support\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOn-Board Firmware Upload Interface\u003c\/strong\u003e — Easily re-flash your own custom firmware via the back-panel programming port\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAndroid APP Compatible\u003c\/strong\u003e — Use the provided simple Android app for no-code control right out of the box\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2.4GHz Router Compatible\u003c\/strong\u003e — Note: Supports 2.4GHz routers only; 5GHz routers are not supported\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThree Development Paths to Suit Every Skill Level\u003c\/h3\u003e\n\u003ch4\u003eMethod 1 – Protocol-Based Custom Development\u003c\/h4\u003e\n\u003cp\u003eUse the built-in communication protocol instructions to write your own control program on a PC or mobile device. Configure working modes (TCPServer, TCPClient, HTTP_GET, MQTT, or Bafa Cloud) via the provided settings tool — ideal for programmers who prefer coding their own control interface.\u003c\/p\u003e\n\n\u003ch4\u003eMethod 2 – Plug-and-Play App Control (No Coding Required)\u003c\/h4\u003e\n\u003cp\u003eUse the included Android APP to control the board directly over Server or Client mode, with no programming knowledge needed. Perfect for everyday users who want smart-switch functionality without writing a single line of code.\u003c\/p\u003e\n\n\u003ch4\u003eMethod 3 – Full Firmware Redevelopment\u003c\/h4\u003e\n\u003cp\u003eFor advanced hardware developers, the on-board firmware burning interface lets you completely rewrite the ESP8266-12F firmware, giving you 100% flexibility to meet any custom requirement or integrate with any IoT platform.\u003c\/p\u003e\n\n\u003ch3\u003eWhat Can You Control?\u003c\/h3\u003e\n\u003cp\u003eThis module is suitable for creating smart switches to control most standard household appliances, including:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eElectric lights and lamps\u003c\/li\u003e\n  \u003cli\u003eCeiling and table fans\u003c\/li\u003e\n  \u003cli\u003eElectric blankets and heating pads\u003c\/li\u003e\n  \u003cli\u003eSmall motors and pumps\u003c\/li\u003e\n  \u003cli\u003eVarious other AC\/DC electrical devices\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChipset:\u003c\/strong\u003e ESP8266-12F\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Channels:\u003c\/strong\u003e 4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSupported Power:\u003c\/strong\u003e 220V AC \/ 12V DC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWiFi Band:\u003c\/strong\u003e 2.4GHz (5GHz NOT supported)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSupported Protocols:\u003c\/strong\u003e TCPServer, TCPClient, HTTP_GET, MQTT, Bafa Cloud\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProgramming Interface:\u003c\/strong\u003e Firmware upload port on back panel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEU LVD Voltage:\u003c\/strong\u003e Low voltage — below 50V AC or 75V DC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Made in Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× 4-Way Relay Module \u003cem\u003eor\u003c\/em\u003e 1× Burner (depending on selected option)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Due to lighting and screen differences, colors may vary slightly from product images. Please allow 1mm–1cm differences due to manual measurement.\u003c\/p\u003e\n\n\u003ch3\u003eLearn More About Smart Home \u0026amp; IoT Safety\u003c\/h3\u003e\n\u003cp\u003eFor guidance on safe electrical device use at home, refer to the U.S. Consumer Product Safety Commission (CPSC) Home Safety resources. For IoT and smart device standards, the NIST Cybersecurity for IoT Program offers helpful guidance for developers and consumers alike.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Does the ESP8266-12F WiFi relay module work with 5GHz routers?\u003c\/h4\u003e\n\u003cp\u003eA: No — this module supports \u003cstrong\u003e2.4GHz WiFi routers only\u003c\/strong\u003e. If your router is a 5GHz-only model, it will not connect. Most dual-band routers broadcast both 2.4GHz and 5GHz networks; simply connect the module to your 2.4GHz network.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Do I need programming experience to use this 4-channel relay board?\u003c\/h4\u003e\n\u003cp\u003eA: Not at all! The board ships with pre-installed firmware and a compatible Android APP that lets you control all four relays with no coding. For users who want more customization, the on-board programming interface supports uploading custom ESP8266 firmware.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What types of appliances can I control with this WiFi relay module?\u003c\/h4\u003e\n\u003cp\u003eA: You can control most standard household appliances rated for 220V AC, including lights, fans, electric blankets, and small motors. For DC setups, the module also supports 12V DC operation, making it suitable for a wide range of DIY electronics and automation projects.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Which communication protocols does this relay module support?\u003c\/h4\u003e\n\u003cp\u003eA: The board comes pre-loaded with \u003cstrong\u003eTCPServer, TCPClient, HTTP_GET, MQTT, and Bafa Cloud\u003c\/strong\u003e communication modes. You can switch between modes using the provided settings tool, or completely replace the firmware with your own to support any additional protocol you require.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Does the ESP8266-12F WiFi relay module work with 5GHz routers?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — this module supports 2.4GHz WiFi routers only. If your router is a 5GHz-only model, it will not connect. 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