LilyGo TTGO T-Relay ESP32 Relay Board. I had fun in my previous video where I used a relay board to allow me to control a Raspberry Pi using an Arduino UNO. When I saw this LilyGo TTGO T-Relay ESP32 Relay Board, I just knew I needed to get my hands on one. Let's unbox the LilyGo TTGO T-Relay and see what we can make of it using the example sketches on the LilyGo Github site. Raspberry Pi Controlled By Arduino UNO With Relay Shield. Check out all my adventures working with the TTGO T-Display. Xinyuan-LilyGO / LilyGo-T-Relay on Github