int led = 9; int button = 8; int buttonState =0; int brightness = 0; int brightup = 2; int duty = 50; int nduty = map(duty, 0, 100, 0, 255); void setup () { TCCR2B &= ~ _BV (CS22); // cancel pre-scaler of 64 TCCR2B |= _BV (CS20);// no pre-scaler analogWrite (9, nduty…

Want to get 20 KHz frequency but I am getting 31 KHz frequency on arduino

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