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Green circuit board with four relay blocks and ESP8266 module

YINGHUA

YINGHUA 4 Channel Relay Module ESP8266 5V/12V

SKU CH-ECG2-ES8AV

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.

How it compares

Measured against everything we stock in Worldwide Power Cords, at today’s prices. Recalculated every night.

Price $11.99
Pricier than about 80% of the 1,208 comparable items (median $9.99).

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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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