void setup() {
 Serial.begin(9600);
 pinMode(3, OUTPUT);
 pinMode(9, OUTPUT);
 pinMode(10, OUTPUT);
 }
void loop() {
 int ldr=analogRead(A0);
  Serial.println(ldr);
 if(ldr<200 && ldr>70){
  analogWrite(3, ldr);
  analogWrite(9, 0);
  analogWrite(10, 0);
  delay(200);
 }
 else if(ldr>200 && ldr<700){
   analogWrite(3, 0);
  analogWrite(9, ldr);
  analogWrite(10, 0);
  delay(200);
 }
 else if(ldr>700 ){
   analogWrite(3, 0);
  analogWrite(9, 0);
  analogWrite(10, ldr);
  delay(200);
 }
 else {
  analogWrite(3,0);
  analogWrite(9, 0);
  analogWrite(10, 0);
   delay(200);
 }
 
}