#define out 0
#define charge 1

float batv = 0.0;
float in1v = 0.0;
float in3v = 0.0;
float temp1 = 0.0;
float temp2 = 0.0;
float temp3 = 0.0;
int r1 = 98600; 
int r2 = 21800;
int r3 = 98100;
int r4 = 21700;
//int r5 = 97500;
//int r6 = 21800;
int PWM = 0;

void setup() {
  pinMode(out, OUTPUT);
  pinMode(charge, OUTPUT);
  digitalWrite(out, LOW);
  digitalWrite(charge, LOW);
}
  
void loop() {
  read_bat_volt();
  read_in1_volt();
  //read_in3_volt();
  bat_volt_protect();
  bat_charge();
  delay(10);
}

void read_bat_volt(void){
  int analogvalue1 = analogRead(A1);
    temp1 = (analogvalue1 * 5.0) / 1024.0;
    batv = temp1 / (r2/(r1+r2));
}
void read_in1_volt(void){
  int analogvalue2 = analogRead(A2);
    temp2 = (analogvalue2 * 5.0) / 1024.0;
    in1v = temp2 / (r4/(r3+r4));
}/*
void read_in3_volt(void){
  int analogvalue3 = analogRead(A3);
    temp3 = (analogvalue3 * 5.0) / 1024.0;
    in3v = temp3 / (r6/(r5+r6));
}*/
void turn_on_output(void){
  if(batv > in1v)
  digitalWrite(out,HIGH);
  else
  digitalWrite(out, LOW);
}
void bat_volt_protect(void){
  if(batv >= 13)
     digitalWrite(out, LOW);
  else if (batv <= 11) 
     digitalWrite(out, LOW);
   else
     digitalWrite(out, HIGH);
}
void bat_charge(void){
  if(batv <= 11.1){
    PWM++;
    PWM = constrain(PWM,0,254);
  }
  else if(batv >=13) {
    PWM = 0;
    PWM = constrain(PWM,0,254);
  }
  else{
    PWM--;
    PWM = constrain(PWM,0,254);
  }
  analogWrite(charge, PWM);
}