Counting pulses with edge detection using digitalRead

[FernandoGarcia]

You can use this method to detect edged using interrupt.

Measure time between pulses with ESP32 and interrupt

From what I remember now, millis can't be used inside an ISR. But you can use micros if the interval between pulses is not so long. Here an example: #if defined(ESP8266) void ICACHE_RAM_ATTR falling(); void ICACHE_RAM_ATTR rising(); #define PIN D8 // PIN where the PWM singal arrives #else #define PIN 2 // PIN where the PWM singal arrives #endif // global variables volatile unsigned int pulse_width = 0; volatile unsigned int prev_time = 0; void rising() { attachInterrupt(digitalPinToI…