// voltage charge controller using incremental dump loads and led volt level indicator 
// initial code was led voltage indicator built for 10 volt found here mechatrofice.com/arduino/led-voltage-level-indicator
// led volt level indicator are pins 9,10,11,12 relay shield pins are 4,5,6,7
// voltage map will need to be adjusted depending on voltage also voltage divider resistors changed

float volt, voltage;
void setup() {
}

void loop() {
  volt = analogRead(A0);
  voltage = map(volt, 0, 1023, 0, 29.5);

    pinMode(6, OUTPUT);        // relay 3
  pinMode(4, OUTPUT);        // relay 1
  pinMode(5, OUTPUT);        // relay 2
  pinMode(7, OUTPUT);        // relay 4
  
  if (voltage >= 0) {
    
  digitalWrite(9, HIGH); // pin 9 is a led status on indicator only
  
  }
  else {
    digitalWrite(9, LOW);
  }
  if (voltage >= 12) {
    digitalWrite(10, HIGH);
    digitalWrite (4, HIGH);
    
  }
  else {
    digitalWrite(10, LOW);
    digitalWrite (4, LOW);
    
  }
  if (voltage >= 13) {
    
    digitalWrite (11, HIGH);
    digitalWrite (5, HIGH);
  }
  else {
    digitalWrite(11, LOW);
    digitalWrite (5, LOW);
    
  
  }
  if (voltage >= 14) {
    digitalWrite(12, HIGH); // 
    digitalWrite (6, HIGH);
    digitalWrite (7, HIGH);
  }
  else {
    digitalWrite(12, LOW);
    digitalWrite (6, LOW);
    digitalWrite (7, LOW);
  }
  delay(60000); // 60 second delay keeps relays from turning on and off too quickly 
}