Docs
How LapDog works, how to build one, and the protocols it speaks.
How it works
How a US$6 ESP32-C5 hears your drone fly through the gate, and where the lap times go.
Hardware
What you need to build a LapDog, and what to watch out for.
Firmware
Building and flashing the timer, and its USB console.
Android app
The LapDog companion app — live laps over Bluetooth or USB, and timer settings.
Protocol
The LapDog frame format on USB and Bluetooth, and the ELRS Backpack OSD messages on ESP-NOW.