Obviously, the solution is an electronic lap counter, which [Peter] promptly set about creating. The build is based around an ultrasonic distance sensor, which is triggered when it detects a ...

Obviously, the solution is an electronic lap counter, which [Peter] promptly set about creating. The build is based around an ultrasonic distance sensor, which is triggered when it detects a ...

The electronic lap counters used at the FINA world championships were a hit among the athletes, giving them a new way of seeing how many lengths are remaining in their distance races.