#define  pinswitch 2
#define pinrelay 3


void setup() {
  // put your setup code here, to run once:
  pinMode(pinswitch, INPUT_PULLUP);
  pinMode(pinrelay,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int ss_switch =digitalRead(pinswitch);
  if(ss_switch==0){
    digitalWrite(pinrelay,HIGH);
  }else{
    digitalWrite(pinrelay,LOW);
  }
}