/*
    Arduino Solar Battery Charge Controller
    https://www.bristolwatch.com/solar_charger.htm
    by Lewis Loflin lewis@bvu.net
*/


/*
Solar cell battery charger/regulator
*/

#define Vin 0
#define CE 2 // charge enable
#define chon   4000 // charge on time
#define choff  4000 // charge off time
#define CP  600 // charge point variable

int val;

void setup()   {
  pinMode(CE, OUTPUT);
  digitalWrite(CE, LOW);
  Serial.begin(9600);
}

void loop()   {

  val = analogRead(Vin);
  while (val > CP) {
    val = analogRead(Vin);
    Serial.print("Charge off val = ");
    Serial.println(val);
    Serial.print("Vbat = ");
    Serial.println(val * .0048 + 10.0);
    delay(2000);
  }
  digitalWrite(CE, HIGH);
  delay(chon);
  digitalWrite(CE, LOW);
  delay(choff);
}