CUK CONVERTER WITH MPPT

INPUT SOURCE -SOLAR PANEL (MAXIMUM OPEN LOOP VOLTAGE =20V)
OUTPUT LOAD-- BATTERY OF 12V






PROGRAM

int c=0;int pwmpin=10,a;
int p=50;

int power,pp,cp;
#include <LiquidCrystal.h>
LiquidCrystal lcd(3, 4, 5, 6, 7, 8);//LCD RS-3,En-4,D4-5,D5- 6,D6-7,D7-8
int x,y;
void setup() 
x= analogRead(A0);
    delay(1); 
    
setPwmFrequency(pwmpin,1);
analogWrite(pwmpin,p);
 lcdstart();
Serial.begin(9600);  
 delay(100); 
}

void loop() 
{
int y=analogRead(5);
Serial.println(y); 
delay(1); 
int i = (analogRead(A0)-x);
delay(1); 
pp=y*i;
 //
if(y>205)
{
p=p-1;analogWrite(pwmpin,p);delay(30); 
 Serial.println("hhhh");
}
if(y<192)
{
  Serial.println("less"); 
p=p+1;if(p>220)p=220;
analogWrite(pwmpin,p);
delay(30);  
  int cv=analogRead(5);
  delay(1);
  int i = (analogRead(A0)-x);
  delay(1);  
cp=cv*i;
 if(cp<pp)
{
 p=p-2; if(p<0)p=0;analogWrite(pwmpin,p);
delay(30); 
}
}

c++;
if(c>20)
{
  c=0;
int i = (analogRead(A0)-x)*36;//*12.56=45//0.045
delay(1);if(i<0)i=0;
float v = y;
v=v/13;
float w=(i*v)/1000;
//delay(100);
lcd.clear();
lcd.setCursor(0, 0); lcd.print(i);  lcd.print("mA");//Serial.println(w);  
lcd.setCursor(8, 0); lcd.print(v);  lcd.print("v");// Print a message to the LCD.
lcd.setCursor(0, 1); lcd.print(w);  lcd.print("W");// Print a message to the LCD.
c=0;
}
}

void lcdstart(void)
{
lcd.begin(16, 2);// set up the LCD's number of columns and rows:
lcd.setCursor(0, 0);
lcd.print("CUK converter");// Print a message to the LCD.
//delay(500);
//lcd.clear();
}
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
 *
 */