/*#include <LiquidCrystal_I2C.h>

const byte Inp1 = 3;
const byte Inp2 = 4;
const byte En1 = 5;
const byte VPOT1 = A0;
const float Vref = 5.0;
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows

void setup() {
  pinMode(Inp1, OUTPUT);
  pinMode(Inp2, OUTPUT);
  pinMode(En1, OUTPUT);
  lcd.init(); // initialize the lcd
  lcd.backlight();
  digitalWrite(Inp2, LOW);
  digitalWrite(En1, HIGH);
 }

void loop() {
  POT1();
}

void POT1(){
int s = analogRead(VPOT1);
float vol = (s * Vref/1023);
int z = map(s, 0, 1023, 0 , 255);
  
char analog_string[7];
dtostrf(vol, 5, 2, analog_string); 
  lcd.clear();                 // clear display
  lcd.setCursor(0, 0);         // move cursor to   (0, 0)
  lcd.print("VPOT:");        // print message at (0, 0)
  lcd.print(analog_string);
  lcd.print("V,");
  lcd.print(s);
  analogWrite(3,z);
  lcd.setCursor(0, 1);         // move cursor to   (0, 0)
  lcd.print("PWM:");        // print message at (0, 0)
  lcd.print(z);
  delay(10);
}
*/

#include <LiquidCrystal_I2C.h>
#include <Wire.h>

const byte Inp1 = 3;
const byte Inp2 = 4;
const byte En1 = 5;
const byte VPOT1 = A0;
const float Vref = 5.0;
const int Buzzer = 7;
const int LED = 6;
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows

void setup() {
  pinMode(Inp1, OUTPUT);
  pinMode(Inp2, OUTPUT);
  pinMode(En1, OUTPUT);
  pinMode(Buzzer, OUTPUT);
  pinMode(LED, OUTPUT);
  lcd.init(); // initialize the lcd
  lcd.backlight();
  digitalWrite(Inp2, LOW);
  digitalWrite(En1, HIGH);
  Serial.begin(9600);
 }

void loop() {
  POT1();
}

void POT1(){
int s = analogRead(VPOT1);
float vol = (s * Vref/1023);
//int z = s/4; 
int z = map(s, 0, 1023, 0 , 255);
  
char analog_string[4];
dtostrf(vol, 5, 2, analog_string);
  
  //lcd.clear();                 // clear display
  lcd.setCursor(0, 0);         // move cursor to   (0, 0)
  lcd.print("V:");        // print message at (0, 0)
  lcd.print(analog_string);
  lcd.print(" PWM:");
  lcd.print(z);
  analogWrite(3,z); //PWM pin 3 output/oscilloscope
  lcd.setCursor(0, 1);         // move cursor to   (0, 0)
  //lcd.print("PWM:");        // print message at (0, 0)
  //lcd.print(z);
   
  // 80% PWM = 204
  if(z > 204){
    tone(Buzzer, 1000);
    digitalWrite(LED,HIGH);
    lcd.print("STATUS : DANGER");
    Serial.println("STATUS : DANGER");
  }
  else{
    noTone(Buzzer);
    digitalWrite(LED,LOW);
    lcd.print("STATUS : NORMAL");
    Serial.println("STATUS : NORMAL");
  }
  
   delay(50);
}