Arduino Uno / ESP-12F. While porting an sketch from Arduino it mysteriously crashed. I isolated the problem to the map() function when the arrays are empty. Once I fill it it works as it should. The ...

For the Arduino UNO the maximum sum of polling is around 62 KHz, so in practice assume 50 KHz. As the signal has to restore from HIGH to LOW the effective input frequency is max 25 KHz. One has to ...