What it is? ====== It is a timer for your fpv drones and whoops.

How does it work? ====== It uses the video transmission signal to estimate the position of the drone, so no new hardware needed on the drones. You calibrate the signal in a certain "gate" and then track your lap times with it.

Make one ====== Print the case and order the parts. You have to superglue the switch slider parts. The two teardrop-shaped holes need to be filled with some translucent material. They difuse the ESP32 T8 leds, I used a 3d pen and translucent PLA as you can see in one of the photos.

Check https://github.com/eried/pidflight-lap-firmware for more details.

** Parts **

• ESP32 TTGO T8 https://s.click.aliexpress.com/e/_d6sfNUb
• RX5808 https://s.click.aliexpress.com/e/_dUaM1rh
• 2x 4.7K resistors
• Small battery (optional) i.e.: https://aliexpi.com/ZSsn
• Buzzer (optional) https://s.click.aliexpress.com/e/_d75AAWT

** Software **

It uses PIDFlight firmware and app (available for several platforms). I adapted the firmware to run on the ESP32. In the future it could work standalone, using BT, Wifi and the SD capabilities of the microcontroller.

Demo: https://www.youtube.com/watch?v=CKgIOPRDrkA