Built-in led is blinking instead of fading

Using Arduino LEDs and Multiplexing
1

hi there!
I have Arduino UNO. Whenever I'm programming built-in led on Arduino as fade, it results in blinking. Don't know what's going wrong, I have used the ready-made program from the example section.
Thanks in Advance

2

Can you post your soft PWM code?

3

Pin 13 on a Uno is not a PWM pin so if you used analogWrite() then the behaviour that you describe is as expected

1 Like
4

sure

/*
  Fade

  This example shows how to fade an LED on pin 9 using the analogWrite()
  function.

  The analogWrite() function uses PWM, so if you want to change the pin you're
  using, be sure to use another PWM capable pin. On most Arduino, the PWM pins
  are identified with a "~" sign, like ~3, ~5, ~6, ~9, ~10 and ~11.

  This example code is in the public domain.

  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Fade
*/

//int led = 9;           // the PWM pin the LED is attached to
int brightness = 0;    // how bright the LED is
int fadeAmount = 5;    // how many points to fade the LED by

// the setup routine runs once when you press reset:
void setup() {
  // declare pin 9 to be an output:
  pinMode(LED_BUILTIN, OUTPUT);
}

// the loop routine runs over and over again forever:
void loop() {
  // set the brightness of pin 9:
  analogWrite(LED_BUILTIN, brightness);

  // change the brightness for next time through the loop:
  brightness = brightness + fadeAmount;

  // reverse the direction of the fading at the ends of the fade:
  if (brightness <= 0 || brightness >= 255) {
    fadeAmount = -fadeAmount;
  }
  // wait for 30 milliseconds to see the dimming effect
  delay(30);
}
5

Yeah, that's hard(ware) PWM code, completely inappropriate for a pin which has no hard PWM capability.

7

ok thanks

8

ok thanks sir

9

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.