void setup() {
  // put your setup code here, to run once:
  pinMode(7, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(4, OUTPUT);
 Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
int ssr;
ssr=analogRead(A0);
Serial.println(ssr);
if(200>=ssr){
  digitalWrite(7, HIGH);
  digitalWrite(6, LOW);
  digitalWrite(4, LOW);
}else if(ssr>200 && ssr<=500)
{
  digitalWrite(7, LOW);
  digitalWrite(6, HIGH);
  digitalWrite(4, LOW);
}else if(ssr>500 && ssr<=1000)
{
  digitalWrite(7, LOW);
  digitalWrite(6, LOW);
  digitalWrite(4, HIGH);
}
}