#include <Chrono.h>
Chrono chronoA;
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

unsigned long previousTime0=0;
unsigned long lcdOn=60000;

int relay1Pin =10;
int relay2Pin =11;
int ledPin=12;

float cutoff = 10.80; //Cutoff voltage
float overvoltage = 14.20; //Overvoltage
float voltageHysteresis = 0.20;

int upButton =4;
int downButton =5;
int leftButton =6;
int rightButton =7;
int enterButton =8;
int buttonPushEnterCounter = 0; // counter for the number of button presses
int buttonEnterState = LOW;
int lastButtonEnterState = LOW;
//boolean buttonEnterState = LOW; // current state of the button
//boolean lastButtonEnterState = LOW; // previous state of the button

int analogInput1 = A0; // voltage measurement pin
int value1 = 0;
float vout1 = 0.0;
float vin1 = 0.0;
float R1a =235000;
float pot1 = 10000;
bool cFlag1 = false;
bool pinCheck1 = false;
long target1 = 20000; //1.1 min in sec
int mins1 = (target1 / 1000)/60;
int secs1 = round(target1 /1000)%60;

void setup() {
  //Serial.begin(9600);
lcd.init();  // initialize the lcd
lcd.begin(16, 2);
lcd.setBacklight(1);
pinMode(analogInput1,INPUT); // Set pin A0 as Voltage input
pinMode(ledPin, OUTPUT);
pinMode(relay1Pin, OUTPUT);
pinMode(relay2Pin, OUTPUT);
pinMode(upButton,INPUT_PULLUP);
pinMode(downButton,INPUT_PULLUP);
pinMode(leftButton,INPUT_PULLUP);
pinMode(rightButton,INPUT_PULLUP);
pinMode(enterButton,INPUT_PULLUP);
digitalWrite(ledPin,HIGH);
digitalWrite(enterButton, LOW);

lcd.setCursor(0,0);  
lcd.print("Batt protection");
lcd.setCursor(0,1);  
  lcd.print("Vin:");
  lcd.setCursor(5,1);  
  lcd.print(vin1,1);
  lcd.setCursor(9,1);  
  lcd.print("Volt");
}

void loop() {
bool refresh = false;
value1 = analogRead(analogInput1);
vout1 = (value1 * 5.0) / 1024;
vin1 = vout1 / (pot1/(R1a+pot1));

unsigned long currentTime = millis();
if (currentTime - previousTime0 >=lcdOn){  
  lcd.setBacklight(0);
  previousTime0=currentTime; 
  digitalWrite(ledPin,LOW); 
} 
buttonEnterState = digitalRead(enterButton); // read the pushbutton input pin
 if (buttonEnterState != lastButtonEnterState)// compare the buttonState to its previous state
 {
 if (buttonEnterState == HIGH)// if the current state is HIGH then the button went from off to on 
 {
   refresh = true;
  lcd.setBacklight(1);
  digitalWrite(ledPin,HIGH); 
  buttonPushEnterCounter++;  // add one to counter 
 //Serial.println("on");
      //Serial.print("number of button pushes: ");
      //Serial.println(buttonPushEnterCounter);
  if (buttonPushEnterCounter >3) // if counter over 5 reset the counter to 1 to show "Vin1:"                              
  {
  buttonPushEnterCounter =1;
  }
if (refresh == true ) {
    lcd.clear();
  }
  switch (buttonPushEnterCounter) // choose what to display based on buttonPushCounter value
  {    
case 1:
  //lcd.clear();  
  if (refresh == true ) {
  lcd.clear();  
  lcd.setCursor(0,0);  
  lcd.print("cutoff:");
  lcd.setCursor(8,0);  
  lcd.print(cutoff,1);
  lcd.setCursor(13,0);  
  lcd.print("V");
  lcd.setCursor(0,1);  
  lcd.print("overvoltage");
  lcd.setCursor(12,1);  
  lcd.print(overvoltage,1);
  lcd.setCursor(16,1);  
  lcd.print("V");   
  }    
  break;  
  case 2:
  lcd.clear();  
  lcd.setCursor(0,0);  
  lcd.print("Vin:");
  lcd.setCursor(5,0);  
  lcd.print(vin1,1);
  lcd.setCursor(10,0);  
  lcd.print("Volt");
  lcd.setCursor(0,1);  
  lcd.print("Vin3:");
  lcd.setCursor(5,1);  
  lcd.print(vin1,1);
  lcd.setCursor(10,1);  
  lcd.print("Volt");       
  break;  
  case 3:
  lcd.clear();  
  lcd.setCursor(0,0);  
  lcd.print("Temp Battery1 :");
  lcd.setCursor(0,1);  
  lcd.print("C");
  break;
    }
    }
    lastButtonEnterState = buttonEnterState;// save the current state as the last state,for next time through the loop
    }  
  

if (vin1>=overvoltage + voltageHysteresis) {  
   digitalWrite(relay1Pin, HIGH);//Change the state of the relay1
   lcd.setCursor(0,1);  
  lcd.print("Alarm  ");
  
}
if (vin1<=overvoltage ) {
if (chronoA.elapsed() >= target1){
    //if timer has stopped, reset here and trigger alarms
    cFlag1 = false;
    //pinCheck = false;
    chronoA.stop();  
digitalWrite(relay1Pin,LOW); //Change the state of the relay1
}
}

if(digitalRead(upButton)==0){
  cutoff+=0.1;
  lcd.setCursor(0,0);
  lcd.print("cutoff=");
  //Serial.print("cutoff=");
  //Serial.println(cutoff); 
  lcd.setCursor(8,0);
  lcd.print(cutoff,1);
  while(digitalRead(upButton)==0);
  delay(20);//Debounce 
}

if(digitalRead(downButton)==0){
  cutoff-= 0.1;
  lcd.setCursor(0,0);
  lcd.print("cutoff=");
  //Serial.print("cutoff=");
  //Serial.println(cutoff); 
  lcd.setCursor(8,0);
  lcd.print(cutoff,1);
  while(digitalRead(downButton)==0);
  delay(20);//Debounce 
}
}