FOLLOW THIS TO AVOID ERRORS
Me and my friend are always in competition for something, in every sports, from ski to run, to MTB. I decided to build this Chronometer to have a precise measurement of the time spent to complete a pre-made circuit. You just have to choose a start and an end point, and place the two module (we 3D-printed a case for it because we soldered everything on a circuit board, you can also do this if you want something definitve) to start the competition.
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Hope you have fun!
Credits for the wiring label to: https://arduino-info.wikispaces.com/Nrf24L01-2.4GHz-HowTo