Minimal example for running PWM with custom frequency

[rfayat]

Hi,

I am quite new to arduino and need to run PWM with a custom frequency on a pin in a precisely timed fashion at a slow frequency (30/100Hz) on an arduino nano every in an experimental setup (I work in a neuroscience lab).

I guess this toolbox could help doing so, I am however a bit confused by the provided examples which are relatively complex.

I for instance managed to do something similar on an arduino uno using the Arduino PWM Frequency Library (which is unfortunately not compatible with arduino nano every). Using this library, I was for instance able to run PWM at 100Hz with a duty cycle of 50% on pin 3 using:

#include <PWM.h>
#define PIN_PWM 3
int32_t FREQUENCY = 100;  // frequency, Hz
byte DUTY_CYCLE = 128; // 0-255, 128 corresponds to a 50% duty cycle

void setup(){
  InitTimersSafe();
  bool success = SetPinFrequencySafe(PIN_PWM, FREQUENCY);
  pinMode(PIN_PWM, OUTPUT);
}

void loop(){
  // Start PWM on PIN_PWM
  pwmWrite(PIN_PWM, DUTY_CYCLE);
  delay(1000);
  // Stop PWM on PIN_PWM
  digitalWrite(PIN_PWM, LOW);
  delay(1000);
}

Would it be possible to provide a similar minimal example for setting up the frequency/duty cycle and running/stopping PWM on a given pin ? Or did I misunderstand the purpose of this library and should I use a different one ?

Thanks !

rfayat

[khoih-prog]

Would it be possible to provide a similar minimal example for setting up the frequency/duty cycle and running/stopping PWM on a given pin ? Or did I misunderstand the purpose of this library and should I use a different one ?

The library can certainly do that too simple job, provided you know how to program and use it.
I'm sorry this is not a place to train or write code for you. It's better that you ask in other forum for help as I don't have time now for it.

Good Luck,

[rfayat]

Ok no worries, the point was not to get you to write code for me, ISR_PWM.setPWM is documented in the README but starting the PWM is not obvious from reading the example (whose purpose is to demonstrate how powerful the library is). I simply thought that adding a minimal example could help me and others to know how to program and use the library.

Cheers