ArduinoMega 2560 PWM

[frenypc]

I need help pls. Can someone write the code below to programming a pwm 0 to 5
VDC pulse of at least 25 millisecond duration and another for 5 to 15 VDC pulse ?

[gcjr]

a PWM waveform is some % (duty cycle) at some constant frequency.

PWM will not generate a single pulse. it might be easier to simply set a pin HIGH and then LOW after a 25 msec delay, delay(25)

the output is typically to the Vcc of the chip, 5V, but a pulse between 5 and 15V requires an external circuit

[Idahowalker]

Basically, if you want someone to write code for you, have this post moved over to gigs and collaborations.

[johnwasser]

@frenypc

Can someone write the code below to programming a pwm 0 to 5 VDC pulse of at least 25 millisecond duration and another for 5 to 15 VDC pulse ?

Your specification is not clear. Can you draw a timing diagram of what you want?

[frenypc]

Width 25ms
0 V to 5V

[frenypc]

Output 0 to 5 V*

[johnwasser]

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);
  }
}

[frenypc]

Thanks!!!