// Photoresistor and Photodiode
// if light on green led on , if ight off red led //
int lightpen=A0;
int lightval;
int redpin = 6;
int greenpin = 9;
int dv = 250;
void setup() {
  // put your setup code here, to run once:
pinMode(lightpen,INPUT);
Serial.begin(9600);
pinMode(redpin , OUTPUT);
pinMode(greenpin , OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
lightval=analogRead(lightpen);
Serial.println(lightval);
delay(dv)
if(lightval<350){
  digitalWrite(greenpin, HIGH);
  digitalWrite(redpin , LOW);
}
if(lightval>350){
  digitalWrite(redpin , HIGH);
  digitalWrite(greenpin , LOW);
}
}