Arduino based BMX/DH MTB starting gate control with timer and bluetooth.
Aruino based BMX/DH MTB starting gate control box that controls an electromagnetic magnet to release the gate. Has a timing strip made with FSR pressure sensor glued between to 1/16 thick rubber strips. Using HC-06 Bluetooth module control box communicates with any Android smart phone to display times.
I've published on github the bluetooth serial class that wraps all the Android code for establishing and communicating with the HC-06 bluetooth module.