LilyGo TTGO T-Relay ESP32 Dev Board with 4x 5V DC Relays

The LilyGo T-Relay is a board with an ESP32-WROVER-B and four HRS4H-S-DC5V relays that can be switched via Wi-Fi or Bluetooth. The relays are driven via optocouplers, and each has a blue LED for the switching state. The remaining GPIOs are routed to a pin header, interfaces such as UART, SPI and I2C are available.

Important: The board has no USB-to-serial converter, the USB-C socket is only used for power. Programming requires the LilyGo T-U2T, which is not included. An existing T-U2T can be reused.

Important: Installations on the mains may only be carried out by qualified persons.

Recommended Accessories:

• LilyGo TTGO T-U2T USB to TTL Programmer CH9102

Features:

• 4 relays HRS4H-S-DC5V, driven via optocouplers
• Switching capacity according to LilyGo: 250 V AC / 10 A or 28 V DC / 10 A
• Relays K1 to K4 on GPIO21, GPIO19, GPIO18 and GPIO5
• Blue status LED per relay
• ESP32 with Wi-Fi and Bluetooth
• Programming via the LilyGo T-U2T
• Pinout as an image in the picture gallery

Application Examples:

• Switching lights, pumps or fans via Wi-Fi
• Switching actuator for smart home, usable with Tasmota, ESPHome and ESPEasy according to LilyGo
• Time and sensor controlled switching

Documentation:

• ESPHome documentation: ESP32 Platform
• T-Relay on GitHub (LilyGo, English)
• T-Relay in the LilyGo wiki (English)

Technical Data:

• Manufacturer: LilyGo
• Manufacturer number: H516
• Module: ESP32-WROVER-B
• Relays: 4× HRS4H-S-DC5V
• Switching capacity: 250 V AC / 10 A, 28 V DC / 10 A (LilyGo)
• Relay GPIOs: GPIO21, GPIO19, GPIO18, GPIO5
• Input voltage: 12 to 24 V DC or 5 V via USB-C
• Power consumption: 360 to 450 mW
• Wi-Fi: 802.11 b/g/n
• Bluetooth: BLE 4.2
• Interfaces: UART, SPI, I2C, CAN, I2S, SDIO
• Dimensions: 91 × 85 × 17.5 mm
• Weight: 114 g

Scope of Delivery:

• 1× LilyGo TTGO T-Relay ESP32 Dev Board with 4x 5V DC Relays