CUK CONVERTER

INPUT SOURCE -SOLAR PANEL (MAXIMUM OPEN LOOP VOLTAGE =20V) OUTPUT LOAD– BATTERY OF 12V ,WITH CONSTANT VOLTAGE OF 14V 

CIRCUIT

PROGRAM

//feed back by 10k and 1k
//adc value ---0.75 for 8
//adc=2733/4.88 ==560
//to get adc value =v/.11
//8----150
//7.5--139
//7--132
int p=115;
void setup()
{
 setPwmFrequency(9, 1);
 analogWrite(9,p);
 Serial.begin(9600);
}
void loop()
{
 int a=analogRead(2);
 delay(1);
 Serial.println(p);
 if(a>340)
 {
   p=p-1;
   if(p<0)p=0;
   analogWrite(9,p);
 }
 if (a<320 )//&& a>100
 {
   p=p+1;
   if(p>220)p=p-1;
   analogWrite(9,p);
 }
}
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
 *
 */