HIGH VOLTAGE BUCK CONVERTER USING ARDUINO (275V DC TO 165V DC)

CIRCUIT

PROGRAM

void setup()
{
    setPwmFrequency(11, 1);
    analogWrite(11,100);
}
void loop()
{
    /*
      int a=analogRead(3)/4;delay(1);
      if(a>220) a=220;
      analogWrite(11,a);
    */
}
void setPwmFrequency(int pin, int divisor) {
    byte mode;
    if (pin == 5 || pin == 6 || pin == 9 || pin == 10) {
        switch (divisor) {
            case 1: mode = 0x01; break;
            case 8: mode = 0x02; break;
            case 64: mode = 0x03; break;
            case 256: mode = 0x04; break;
            case 1024: mode = 0x05; break;
            default: return;
        }
        if (pin == 5 || pin == 6) {
            TCCR0B = TCCR0B & 0b11111000 | mode;
        } else {
            TCCR1B = TCCR1B & 0b11111000 | mode;
        }
    } else if (pin == 3 || pin == 11) {
        switch (divisor) {
            case 1: mode = 0x01; break;
            case 8: mode = 0x02; break;
            case 32: mode = 0x03; break;
            case 64: mode = 0x04; break;
            case 128: mode = 0x05; break;
            case 256: mode = 0x06; break;
            case 1024: mode = 0x7; break;
            default: return;
        }
        TCCR2B = TCCR2B & 0b11111000 | mode;
    }
}

/**
    Divides a given PWM pin frequency by a divisor.
    The resulting frequency is equal to the base frequency divided by
    the given divisor:
        - Base frequencies:
         o The base frequency for pins 3, 9, 10, and 11 is 31250 Hz.
         o The base frequency for pins 5 and 6 is 62500 Hz.
        - Divisors:
         o The divisors available on pins 5, 6, 9 and 10 are: 1, 8, 64,
           256, and 1024.
         o The divisors available on pins 3 and 11 are: 1, 8, 32, 64,
           128, 256, and 1024.
    PWM frequencies are tied together in pairs of pins. If one in a
    pair is changed, the other is also changed to match:
        - Pins 5 and 6 are paired on timer0
        - Pins 9 and 10 are paired on timer1
        - Pins 3 and 11 are paired on timer2
    Note that this function will have side effects on anything else
    that uses timers:
        - Changes on pins 3, 5, 6, or 11 may cause the delay() and
          millis() functions to stop working. Other timing-related
          functions may also be affected.
        - Changes on pins 9 or 10 will cause the Servo library to function
          incorrectly.
    Thanks to macegr of the Arduino forums for his documentation of the
    PWM frequency divisors. His post can be viewed at:
        http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1235060559/0#4
*/