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[Raspberry pi fan control and monitoring with bash](https://www.domoticz.com/wiki/Raspberry_pi_fan_control_and_monitoring_with_bash)

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const byte OC1A_PIN = 9;
const byte OC1B_PIN = 10;

const word PWM_FREQ_HZ = 25000; //Adjust this value to adjust the frequency
const word TCNT1_TOP = 16000000/(2*PWM_FREQ_HZ);

byte in = 0;

void setup() {
  
  pinMode(OC1A_PIN, OUTPUT);
  Serial.begin(9600);
  Serial.println("Demarage du PWM"); // so I can keep track of what is loaded
 


  // Clear Timer1 control and count registers
  TCCR1A = 0;
  TCCR1B = 0;
  TCNT1  = 0;

  // Set Timer1 configuration
  // COM1A(1:0) = 0b10   (Output A clear rising/set falling)
  // COM1B(1:0) = 0b00   (Output B normal operation)
  // WGM(13:10) = 0b1010 (Phase correct PWM)
  // ICNC1      = 0b0    (Input capture noise canceler disabled)
  // ICES1      = 0b0    (Input capture edge select disabled)
  // CS(12:10)  = 0b001  (Input clock select = clock/1)
  
  TCCR1A |= (1 << COM1A1) | (1 << WGM11);
  TCCR1B |= (1 << WGM13) | (1 << CS10);
  ICR1 = TCNT1_TOP;
}

void loop() {
if (Serial.available()) {       // Check if there's data
    char buf[10];
    int in = Serial.readBytesUntil('\n', buf, sizeof buf - 1);
    buf[in]=0;
    in = atoi(buf);
    if (in > 100)
      in = 100;
    Serial.println(in);// Pass the value of "in" to the pin}
    setPwmDuty(in); //Change this value 0-100 to adjust duty cycle
}
}
void setPwmDuty(byte duty) {
  OCR1A = (word) (duty*TCNT1_TOP)/100;
}