NANO PWM

Projects Programming
1

hi folks,

i've got my nano to pulse and can adjust the on time with a potentiometer and the off time with onother one, all i want is 1 more pot to adjust my frequentie is that possible, here is how far i am

int ledPin = 9;      // LED connected to digital pin 9

int analogPin = 3;   // potentiometer connected to analog pin 3

int val = 0;         // variable to store the read value
int analogPin2 = 2;   // potentiometer connected to analog pin 3

int val2 = 0;         // variable to store the read value



void setup()

{
 Serial.begin(9600);
  pinMode(ledPin, OUTPUT);   // sets the pin as output
TCCR2B = TCCR2B & 0b11111000 | 0x01;
}



void loop()

{

  val = analogRead(analogPin);   // read the input pin
 val2 = analogRead(analogPin2);   // read the input pin

   digitalWrite(9, HIGH);
  delayMicroseconds(val); // Approximately 10% duty cycle @ 1KHz
  digitalWrite(9, LOW);
  delayMicroseconds(val2);


}
2

whel it works like this but i don't think that's how is should be done

any idea's

int ledPin = 9;      // LED connected to digital pin 9

int analogPin = 3;   // potentiometer connected to analog pin 3
int val = 0;         // variable to store the read value
int analogPin2 = 2;   // potentiometer connected to analog pin 2
int val2 = 0;         // variable to store the read value
int analogPin3 = 1;   // potentiometer connected to analog pin 1
int val3 = 0;         // variable to store the read value


void setup()

{
 pinMode(ledPin, OUTPUT);   // sets the pin as output
 TCCR2B = TCCR2B & 0b11111000 | 0x01;
}



void loop()

{

 val3 = analogRead(analogPin3);
 val = analogRead(analogPin);   // read the input pin
 val2 = analogRead(analogPin2);   // read the input pin
  digitalWrite(9, HIGH);
  delayMicroseconds(val + val3); // Approximately 10% duty cycle @ 1KHz
  digitalWrite(9, LOW);
  delayMicroseconds(val2 + val3);
}
3

Hi,

Messing with the timer registers
TCCR2B = TCCR2B & 0b11111000 | 0x01;
makes no sense to me, and I see no reason in your posted code for it. Suggest trying removal.

best,
Michael

Edit: P.S. analogRead and digitalWrite each take a fair number of processor cycles, so your 10% duty cycle is not going to be very accurate.