int Ledyellow = 21; 
int Ledgreen = 18;
int LDR = 12; 
int nilaiLDR = 0;


void setup(){
 pinMode(Ledyellow, OUTPUT); 
 pinMode(Ledgreen, OUTPUT);  
 Serial.begin(9600);    
 
}
 void loop(){
 nilaiLDR=analogRead(LDR);
 Serial.print("Nilai LDR =");
 Serial.println(nilaiLDR);

 if (nilaiLDR > 500){
 digitalWrite(Ledyellow,HIGH);
 digitalWrite(Ledgreen,LOW); 
 
 }

 else if (nilaiLDR < 500 ){
 digitalWrite(Ledgreen, HIGH); 
 digitalWrite(Ledyellow,LOW);
 }
 }