test code for faults

#include <LiquidCrystal.h>
LiquidCrystal lcd(2, 4, 5, 6, 7, 8);


#define ADJUST_PIN A0
#define BUCK_PIN 3
#define BOOST_PIN 11
#define VIN 12.0
#define BOOST_EN 13
#define BUCK_EN 12
#define VOUT_PIN A1

int hystrsis = 5;

void setup() {
  pinMode(BUCK_PIN, OUTPUT);
  pinMode(BOOST_PIN, OUTPUT);
  pinMode(BOOST_EN, OUTPUT);
  pinMode(BUCK_EN, OUTPUT);
  TCCR2B = TCCR2B & B11111000 | B00000010; // for PWM frequency of 3921.16 Hz
  Serial.begin(9600);
  lcd.begin(16, 2);

}

void loop() {
  float Vout = volt_adjust();
  if (Vout >= 12.0) {
    boost_regulating(Vout);
  }
  else if (Vout < 12.0) {
    buck_regulating(Vout);
  }
}

void boost_regulating(float Vout) {
  digitalWrite(BUCK_EN, HIGH);
  digitalWrite(BOOST_EN, LOW);
  float Vout_feedback = (analogRead(VOUT_PIN) * 120.0) / 1023.0; //calculate v feedback
  float duty = 1.0 - (VIN / Vout);
  float analog_output = duty * 255.0;
  analog_output = constrain(analog_output, 0, 255);
  analogWrite(BOOST_PIN, analog_output);

  while ((Vout - Vout_feedback) > (Vout * 0.15)) {
    analog_output++;
    analog_output = constrain(analog_output, 0, 255);
    analogWrite(BOOST_PIN, analog_output);
    Vout_feedback = (analogRead(VOUT_PIN) * 120.0) / 1023.0;
    Serial.println(Vout_feedback);
  }
  while ((Vout_feedback - Vout) > (Vout * 0.15)) {
    analog_output--;
    analog_output = constrain(analog_output, 0, 255);
    analogWrite(BOOST_PIN, analog_output);
    Vout_feedback = (analogRead(VOUT_PIN) * 120.0) / 1023.0;
    Serial.println(Vout_feedback);
  }
}

void buck_regulating(float Vout) {
  digitalWrite(BOOST_EN, HIGH);
  digitalWrite(BUCK_EN, LOW);
  float Vout_feedback = (analogRead(VOUT_PIN) * 120.0) / 1023.0; //calculate v feedback
  float duty = (Vout / VIN);
  float analog_output = duty * 255.0;
  analog_output = constrain(analog_output, 0, 255);
  analogWrite(BUCK_PIN, analog_output);

  while ((Vout - Vout_feedback) > (Vout * 0.15)) {
    analog_output++;
    analog_output = constrain(analog_output, 0, 255);
    analogWrite(BUCK_PIN, analog_output);
    Vout_feedback = (analogRead(VOUT_PIN) * 120.0) / 1023.0;
    Serial.println(analog_output);
  }
  while ((Vout_feedback - Vout) > (Vout * 0.15)) {
    analog_output--;
    analog_output = constrain(analog_output, 0, 255);
    analogWrite(BUCK_PIN, analog_output);
    Vout_feedback = (analogRead(VOUT_PIN) * 120.0) / 1023.0;
    Serial.println(analog_output);
  }
}
float volt_adjust() {
  delay(50);
  int pot_read = analogRead(ADJUST_PIN);
  pot_read = map(pot_read, 0, 1023, 0, 120);
  pot_read = constrain(pot_read, 0, 120);

  lcd.clear();
  lcd.setCursor(2, 0);
  lcd.print("OUTPUT VOLT");
  lcd.setCursor(5, 1);
  lcd.print(pot_read);
  lcd.print(" V");

  return pot_read;
  //return 6.0;
}