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1  Forum 2005-2010 (read only) / Syntax & Programs / Single Frequency, variable Duty cycle PWM on: May 23, 2010, 01:40:58 pm
I'm in the process of creating an LED array of 12 red LED's and 76 white LED's  (switched), with the hopes of varying the brightness. I've tried creating a 555 timer circuit (which I can never get working) to no avail. I wrote some code that will vary the Duty Cycle directly with the input analog value (ie resistor). Can anybody point out any problems or shortcuts that can be used?

Code:
int potPin=  5;
int ledPin = 11;
int val = 0;


void setup()
{
pinMode(ledPin, OUTPUT);   // sets the pin as output
TCCR2A = _BV(COM2A1) | _BV(COM2B1) | _BV(WGM20);
TCCR2B = _BV(CS22);    
}



void loop()
{
val = analogRead(potPin);    // read the value from the sensor
OCR2A = val;                 //Value of sensor denotes PWM duty cycle
analogWrite(ledPin, HIGH);   //Pulse LED pin with the OCR2A value
}

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