LED Photoresistor Arduino Read

chemecar.ino

/* CHEMICAL CAR: ARDUINO SKETCH
 *  You shouldn't have to change anything below the define lines.
 *  Contact Jordan (jm@jhu.edu) with questions.
 */

#define MOTOR     7
#define SENSOR   A0
#define LED13    13
#define DELAY  5000

// Don't change code below this line!

int BASELINE = 0;


void setup() {
  delay(5000);
  pinMode(MOTOR, OUTPUT);
  pinMode(LED13, OUTPUT);
  digitalWrite(MOTOR, HIGH);
  BASELINE = analogRead(SENSOR);
  Serial.begin(9600);
}


void loop() {
  int r = analogRead(SENSOR);
  if (r > (BASELINE + 50)) {
    digitalWrite(MOTOR, LOW);
    Serial.println(r);
    digitalWrite(LED13, HIGH);
  } else {
    digitalWrite(LED13, LOW);
    digitalWrite(MOTOR, HIGH);
    Serial.println(r);
  }
}