void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
pinMode(2, INPUT);
pinMode(4, OUTPUT);
pinMode(7, OUTPUT);
}

void loop() {
int sensorValue = digitalRead(2);
Serial.println(sensorValue);
if (sensorValue==0){
  digitalWrite(7, HIGH);
  digitalWrite(4, LOW);
}else if(sensorValue==1){
  digitalWrite(4, HIGH);
  digitalWrite(7, LOW);
}

}