int lightPen=A0;
int lightVal;
int dv=250;
int redPin=9;
int greenPin=8;
void setup() {
  // put your setup code here, to run once:
  pinMode(lightPen,INPUT);
  pinMode(redPin,OUTPUT);
  pinMode(greenPin,OUTPUT);
  Serial.begin(9600);
}
 
void loop() {
lightVal=analogRead(lightPen);
Serial.println(lightVal);
delay(dv);
if (lightVal>350){
  digitalWrite(greenPin,HIGH);
  digitalWrite(redPin,LOW);
}
if (lightVal<350){
    digitalWrite(greenPin,LOW);
  digitalWrite(redPin,HIGH);
}
}