Where do i put the code to alter timers?

I've found a sketch posted on the old forum that does basically all i want.... i.e. reads data from x-sim, and sends it via the arduino to my real gauges.

Only problem i have is that it is using pwm to vary the voltage to earth to make the needles move in the gauges, and this is causing the coils in the air-core gauges to 'sing' due to the low frequency of the pwm.

i need to run the pwm to those gauges at 31Khz to make them silent (to our ears), i'm using a mega 1280, so think timer 4 is best to alter???

i think i need to add "TCCR4B = TCCR4B 0b11111000 | 0x01", but where do i add it in the sketch? and do i need any other code to make timer 4 run at 31Khz?

The sketch i am using for my gauges is below, originally written my 'herctrap'

Code:

int rpm;
int i;
int leds;
int Speed;
int fuel;
int oil;
int previous_potion = 0;
int rotate;
int water;

char kind_of_data;

void setup(){

  Serial.begin(115200);

  pinMode(22, OUTPUT);
  pinMode(23, OUTPUT);
}

void loop()
{
  //****************************** READ DATA FROM SERIAL ******************************
  while(Serial.available() > 0)
  {

   kind_of_data = Serial.read();
   if (kind_of_data == 'R' ) Read_Rpm();
   if (kind_of_data == 'F' ) Read_Fuel();
   if (kind_of_data == 'W' ) Read_Water();
   if (kind_of_data == 'O' ) Read_Oil();

  }

  //****************************** READ DATA FROM SERIAL END ******************************
}

void Read_Rpm(){

  delay(1);
  int Rpm100 = Serial.read()- '0';
  delay(1);
  int Rpm10 = Serial.read()- '0';
  delay(1);
  int Rpm1 = Serial.read()- '0';

  int rpm = 100*Rpm100 + 10*Rpm10 + Rpm1;
  tone(9, map(rpm,127,255,45,433));

}

void Read_Fuel(){
  delay(1);
  int Fuel100 = Serial.read()- '0';
  delay(1);
  int Fuel10 = Serial.read()- '0';
  delay(1);
  int Fuel1 = Serial.read()- '0';

  fuel = 100*Fuel100 + 10*Fuel10 + Fuel1;

  analogWrite(6,map(fuel,127,255,0,255));
  if (fuel<155) digitalWrite(22,HIGH);
  if (fuel>155) digitalWrite(22,LOW);

}

void Read_Water(){
  delay(1);
  int Water100 = Serial.read()- '0';
  delay(1);
  int Water10 = Serial.read()- '0';
  delay(1);
  int Water1 = Serial.read()- '0';

  water = 100*Water100 + 10*Water10 + Water1;

  analogWrite(7,map(water,127,255,0,255));
   if (water>200) digitalWrite(23,HIGH);
  if (water<200) digitalWrite(23,LOW);

}

void Read_Oil(){
  delay(1);
  int Oil100 = Serial.read()- '0';
  delay(1);
  int Oil10 = Serial.read()- '0';
  delay(1);
  int Oil1 = Serial.read()- '0';

  oil = 100*Oil100 + 10*Oil10 + Oil1;

  analogWrite(8,map(oil,127,255,0,255));
}

Would someone be kind enough to indicate where i need to insert the code in the above sketch to set the timer that runs pins 6, 7 & 8 @ 31Khz please (or any other set of 3 analog pins, as long as the timer being changed dosent throw off other things like the servo lib. as i will be using that nest for some gauges that were mechanical and having servos shoved in them.

	Author	Topic: Where do i put the code to alter timers? (Read 276 times)
0 Members and 1 Guest are viewing this topic.