T-Relay-8 – An ESP32 board with 8 relays


LilyGo T-Relay-8 is an ESP32 WiFi & BLE board equipped with eight 5V relays supporting up to 250V AC or 28V DC, as well as a 16-pin GPIO header for expansion.

The board offers a more compact solution than the usual two-board setups with an ESP32 board and a separate 8-relay “Arduino” module, and also integrates optocouplers for added security.

LilyGo T-Relay-8 Specifications:

  • Wireless Module – ESP32-WROVER-E Module with ESP32 Dual-Core CPU with 2.4GHz WiFi 4 and Bluetooth 4.2 Connectivity, 4MB Flash, 8MB PSRAM
  • Relay – 8x HRS4H-S-DC5V 5V relay up to 250VAC/10A or 28VDC/10A with octocoupler isolation, blue LEDs for status
  • Expansion – 16 pin header (unpopulated) with GPIO, 3.3V and GND
  • USB – 1x USB Type-C for programming via optional T-U2T dongle via CH9102 USB to TTL chip
  • Miscellaneous – Reset Button, Red User LED
  • Power – 12V to 24V via 2 pin terminal block
  • Dimensions – 17 x 8.5 x 1.8 cm (the length is 17.5 cm if the PCB antenna of the ESP32 module is taken into account)

T-Relay-8 pinout

The board can be programmed with the Arduino or PlatformIO IDE, and LilyGo provides instructions and sample code to control relays via the Blynk IoT platform or a web server, as well as a simpler example of flasher type turning relays on and off in sequence. Note that like many LilyGo boards, T-Relay-8 does not come with a built-in USB-TTL chip, and instead users would need to connect the CH9102 chip-based T-U2T dongle to program the ESP32 . module.

LilyGo T-Relay-8 ESP32 board can be purchased with two unsoldered GPIO headers for $22.38 including shipping, or $27.98 if you don’t already have the required T-U2T dongle. If you can do with an ESP32 board with only 4 relays instead of 8, the T-Relay is sold for $10.37 more shipping.

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