Arduino code for soil humidity and LDR (light measurement)

SC5 hackathon 2014-03-27

// http://forum.arduino.cc/index.php/topic,37975.0.html


#define moisture_input A0
#define divider_top 7
#define divider_bottom 8

int SoilMoisture(){
  int reading;
  // set driver pins to outputs
  pinMode(divider_top,OUTPUT);
  pinMode(divider_bottom,OUTPUT);

  // drive a current through the divider in one direction
  digitalWrite(divider_top,HIGH);
  digitalWrite(divider_bottom,LOW);

  // wait a moment for capacitance effects to settle
  delay(1000);

  // take a reading
  reading=analogRead(moisture_input);

  // reverse the current
  digitalWrite(divider_top,LOW);
  digitalWrite(divider_bottom,HIGH);

  // give as much time in 'revers'e as in 'forward'
  delay(1000);

  // stop the current
  digitalWrite(divider_bottom,LOW);

  pinMode(divider_top,INPUT);
  pinMode(divider_bottom,INPUT);

  return reading;

}


void setup() {
  Serial.begin(115200);
  pinMode(4,OUTPUT);
  Serial.println("Booted");

}

void loop() {
  int light = analogRead(1);
  //Serial.println(SoilMoisture(), DEC);
  Serial.println(light, DEC);
  if (light > 300)
  {
    digitalWrite(4,HIGH);
  }
  else
  {
    digitalWrite(4,LOW);
  }
  delay(500);  
}