Help with code please

Projects Programming
1

I am very new to working with the arduino and am trying to use some code from a youtube video to test a computer fan using pwm... I copied the code exactly as far as i can tell. I keep getting void error. People in comments say that the code works for them so i can only assume I'm typing something wrong. The channel is 'science fun' and the video is ' Arduino Fan Control using High Frequency 25kHz PWM // 4-Wire CPU Fans'.
Thankyou for any help.

const int fan_control_pin = 9; //Blue Wire on Fan (About 25kHz PWM)
int count = 0;
unsigned long start_time;
int rpm; 

void setup() {
  TCCR1A = 0; // undo the configureation done by...
  TCCR1B = 0; // ...the Arduino core library
  TCNT1 = 0; // reset timer
  TCCR1A = _BV(COM1A1) | _BV(COM1B1) | _BV(WGM11); // Undo default timers
  TCCR1B = _BV(WGM13) | _BV(CS10); // for pins 9 & 10
  ICR1 = 320; // PWM will be 0 to 320 instead of 0 to 255
  pinMode( fan_control_pin, OUTPUT);
  OCR1A = 0; // Set PWM to 0 out of 320 on pin 9
  OCR1B = 0; // Set PWM to 0 out of 320 on pin 10
  Serial.begin(9600);
  attachInterrupt(digitalPinToInterrupt(2), counter, RISING); // Yellow Wire
}

Void Loop() {

  for(int pwm = 0; pwm <= 320; pw += 64) {
    OCR1A = pwm;
    delay(5000);
    start_time = millis();
    count = 0;
    while((millis() - start_time) < 1000) {
  }
  rpm = count * 30; // 60/2    -------Spacing incorrect
  Serial.print("PWM = ");
  Serial.print(map(pwm, 0, 320, 0, 100));
  Serial.print("% , Speed = ");
  Serial.print(rpm);
  Serial.println(" rpm");
  }
}

Void counter() {
  count++;
}
2

Case counts in c. In this case (no pun intended) it should be void loop not Void Loop.

3

Rather than copying from a YT vid, find the associated sketch or article then copy/paste.

4

Thankyou This was very helpful

5

I looked for a similar post on here but did not find one. Searching the web is what led me to the video.... maybe I overlooked something but i will make sure to double check in the future.

6
  • Confirm what you want:
for(int pwm = 0; pwm <= 320; pw += 64) {

Or:

for(int pwm = 0; pwm <= 320; pwm += 64) {