// Pin definitions
const int pwmPin = 5;  // PWM output pin
const int voltageSensePin = A0;  // Voltage sensing pin

// Variables
int Vref = 6;  // Desired reference voltage in v 
int t = 50;  // Initial pulse width in microseconds (adjust as needed)

// Functions
void setup() {
  pinMode(pwmPin, OUTPUT);  // Set the PWM pin as an output
  pinMode(voltageSensePin, INPUT);  // Set the voltage sensing pin as an input
  Serial.begin(9600);  // Initialize serial communication for debugging
}

void loop() {
  int sensorValue = analogRead(voltageSensePin);  // Read the analog input
  float Vin = sensorValue * (5.0 / 1023.0);  // Convert the analog reading to voltage
  float Vout = Vin * 12.0 / 5.0;  // Calculate the output voltage
  
  // Debugging
  Serial.print("Vin: ");
  Serial.print(Vin);
  Serial.print(" V, Vout: ");
  Serial.print(Vout);
  Serial.print(" V, t: ");
  Serial.print(t);
  Serial.print(" us, sv ");
  Serial.println(sensorValue);
  
  // Compare Vout with Vref and adjust t accordingly
  if (Vout > 1.02 * Vref) 
  {
    t = t - 2;  // Decrease pulse width
  }
   else if (Vout < 0.98 * Vref)
    {
    t = t + 2;  // Increase pulse width
  }
  
  // Ensure t is within a reasonable range
  if (t < 0) t = 0;
  if (t > 100) t = 100;  // Adjust max value as needed
  
  // Generate PWM signal
  digitalWrite(pwmPin, HIGH);
  delayMicroseconds(t);
  digitalWrite(pwmPin, LOW);
  delayMicroseconds(100 - t);  // Adjust period as needed
}