YINGHUA
YINGHUA 4 Channel Relay Module ESP8266 5V/12V
A 4-channel relay module with built-in ESP8266 for IoT home app control
- 4-channel relay controls multiple devices independently
- ESP8266 chip enables Wi-Fi connectivity for IoT projects
- Built-in ESP01 module simplifies wireless integration
- 5V/12V operating range suits various power sources
IoT Relay Module with ESP8266
This four-channel relay board operates at either 5 V or 12 V and includes an ESP8266 module for wireless control. It suits hobbyists and developers building app-driven home-automation projects that need to switch mains-level loads.
ESP01 Socket for Firmware Flexibility
The on-board ESP01 header lets you swap or reprogram the Wi-Fi module without soldering, so you can load custom firmware or replace a faulty unit. Builders who need more than four switched circuits or a different wireless protocol will require additional hardware.
Highlights
- 4-channel relay controls multiple devices independently
- ESP8266 chip enables Wi-Fi connectivity for IoT projects
- Built-in ESP01 module simplifies wireless integration
- 5V/12V operating range suits various power sources
Specifications
No published specifications for this item yet.
Questions about this item
What replacement ESP-01 module will this board accept when the original Wi-Fi chip wears out?
The on-board socket takes a standard ESP-01 module so you can swap it for any compatible ESP8266-01 variant when needed.
Which power rail — 5 V or 12 V — hits its current limit first when all four relays stay energised?
Each relay coil draws from the selected rail; at 5 V the total coil current is higher, so the 5 V supply reaches its limit before the 12 V rail does.
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