int photocellPin = 0; int photocellReading; int led1 = 13; int led2 = 12; int led3 = 11; int led4 = 10; int led5 = 9; int led6 = 8; int led7 = 7; int led8 = 6; int led9 = 5; int led10 = 4; int led11 = 3; int led12 = 2; int led13 = 1; void setup(void) { pinMode(led1, OUTPUT); pinMode(led2, OUTPUT); pinMode(led3, OUTPUT); pinMode(led4, OUTPUT); pinMode(led5, OUTPUT); pinMode(led6, OUTPUT); pinMode(led7, OUTPUT); pinMode(led8, OUTPUT); pinMode(led9, OUTPUT); pinMode(led10, OUTPUT); pinMode(led11, OUTPUT); pinMode(led12, OUTPUT); pinMode(led13, OUTPUT); } void loop(void) { photocellReading = analogRead(photocellPin); if (photocellReading > 800 ) { digitalWrite(led1, HIGH); digitalWrite(led2, HIGH); digitalWrite(led3, HIGH); digitalWrite(led4, HIGH); digitalWrite(led5, HIGH); digitalWrite(led6, HIGH); digitalWrite(led7, HIGH); digitalWrite(led8, HIGH); digitalWrite(led9, HIGH); digitalWrite(led10, HIGH); digitalWrite(led11, HIGH); digitalWrite(led12, HIGH); digitalWrite(led13, HIGH); } else { digitalWrite(led1, LOW); digitalWrite(led2, LOW); digitalWrite(led3, LOW); digitalWrite(led4, LOW); digitalWrite(led5, LOW); digitalWrite(led6, LOW); digitalWrite(led7, LOW); digitalWrite(led8, LOW); digitalWrite(led9, LOW); digitalWrite(led10, LOW); digitalWrite(led11, LOW); digitalWrite(led12, LOW); digitalWrite(led13, LOW);; } }