This is simple diy lap timer for indoor Tinywhoop style FPV. Make a course and practic in your home. Useing arduino an ultrasonic sensor and a buzzer. The computer and serial monitor is used as a time monitor.
Ultra sonic:
VCC -> 5V
GND -> GND
Trig -> D7
Echo -> D6
Buzzer:
Buzzer+ -> D9
Buzzer- -> GND
Monitor:
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lap:1 Laptime: 5.11s, total:5.11s
lap:2 Laptime: 6.04s, total:11.16s
lap:3 Laptime: 5.81s, total:16.97s
lap:4 Laptime: 6.84s, total:23.81s
lap:5 Laptime: 5.65s, total:29.46s
lap:6 Laptime: 5.00s, total:34.47s