LEDs Fading Speed Control

Solving Approach:

How do you plan to solve it?

To raise brightness you increase the output on pwm pin from 0 to max of 255.

to dim it you reduce it from 255 to 0;

in 255 steps with a short delay after every step up or down.

for (i=0; i <= 255; i++)  {

analogWrite(pwmPin, i);

delay(shortwhile);

}

Read the raw potentiometer on A0,

Use pins 10, 9, 6,5,3

Code

/*Paste your code here*/
int potPin = 0;
int pwmPin[5] = {10, 9, 6, 5, 3};
int pot, poti, period, period_backup, direction;

void setup()
{
  int i;
  period=0;
  period_backup=100; //weird number to start the backup
  direction=0;  // direction is 0 or 1 for going up or down in brightness
  for (i=0; i < 5; i++) {
    pinMode(pwmPin[i], OUTPUT);
  }
  Serial.begin(9600);
}

void ledWaxAndWane(int direction) 
{
  int wax, wane;
  switch(direction) {
    case 0:
    for (wax=0; wax <= 255; wax++) {
      wane= 255-wax;

      analogWrite(pwmPin[0], wax);
      analogWrite(pwmPin[2], wax);
      analogWrite(pwmPin[4], wax);

      analogWrite(pwmPin[1], wane);
      analogWrite(pwmPin[3], wane);

      delay(period);
    }
    break;

    case 1:
    for (wax=0; wax <= 255; wax++) {
      wane= 255-wax;

      analogWrite(pwmPin[0], wane);
      analogWrite(pwmPin[2], wane);
      analogWrite(pwmPin[4], wane);

      analogWrite(pwmPin[1], wax);
      analogWrite(pwmPin[3], wax);

      delay(period);
    }
    break;
  }
}

void loop()
{
  pot = analogRead(potPin);
  period= map(pot, 0, 1023, 1, 10) ;
 
  // print only if potentioeter/period is moved
  if (period != period_backup) {
      Serial.println("");Serial.print("Potentiometer: "); Serial.print(pot);
      Serial.print(", Period: "); Serial.println(period);
      period_backup = period;
  }
  direction ^=1; 
  Serial.println(direction);
  ledWaxAndWane(direction);  
   
  delay(100);
}


 

Output

Video

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Photo of Output

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