ArduinoMega 2560 PWM

Projects Programming
7

So you want an output that is LOW (0V) for 25 milliseconds and then HIGH (5V) for 25 milliseconds and repeats? The 'BlinkWithoutDelay' example can be easily modified to do that:

// constants won't change. Used here to set a pin number:
const int outputPin =  LED_BUILTIN; // the number of the LED pin

// Variables will change:
int outputState = LOW;             // outputState used to set the LED
unsigned long previousMillis = 0;        // will store last time LED was updated

// constants won't change:
const long interval = 25;           // interval at which to blink (milliseconds)

void setup()
{
  // set the digital pin as output:
  pinMode(outputPin, OUTPUT);
}

void loop()
{
  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval)
  {
    // save the last time you blinked the LED
    previousMillis += interval;

    // if the LED is off turn it on and vice-versa:
    if (outputState == LOW)
    {
      outputState = HIGH;
    }
    else
    {
      outputState = LOW;
    }

    // set the LED with the outputState of the variable:
    digitalWrite(outputPin, outputState);
  }
}