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 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 improved safety.

8 relays ESP32 board

LilyGo T-Relay-8 specifications:

  • Wireless module – ESP32-WROVER-E module with ESP32 dual-core processor with 2.4 GHz WiFi 4 and Bluetooth 4.2 connectivity, 4MB flash, 8MB PSRAM
  • Relays – 8x HRS4H-S-DC5V 5V relays up to 250VAC/10A or 28VDC/10A with octocoupler isolation, blue LEDs for status
  • Expansion – 16-pin header (unpopulated) with GPIOs, 3.3V, and GND
  • USB – 1x USB Type-C for programming via optional T-U2T dongle via CH9102 USB to TTL chip
  • Misc – Reset button, red user LED
  • Power Supply – 12V to 24V via 2-pin terminal block
  • Dimensions – 17 x 8.5 x 1.8 cm  (the length is 17.5cm if the ESP32 module PCB antenna is taken into account)

T-Relay-8 pinout

The board can be programmed with the Arduino IDE or PlatformIO, and LilyGo provides instructions and code samples to control the relays through the Blynk IoT platform or a web server, as well as a simpler blinky sample of sort turning on and off the relays in sequence. Note that like many of LilyGo boards, T-Relay-8 does not come with an on-board USB-to-TTL chip, and instead, users would need to connect the T-U2T dongle based on the CH9102 chip 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 have the required T-U2T dongle yet. If you can do with an ESP32 board with just 4 relays instead of 8, the T-Relay is sold for $10.37 plus shipping.

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