#define PIN_SWITCH 2
#define PIN_RELAY 3
void setup() {
// put your setup code here, to run once:
pinMode(PIN_SWITCH, INPUT_PULLUP);
pinMode(PIN_RELAY, OUTPUT);
}
void loop() {
// put your main code here, to run repeatedly:
if ( digitalRead(PIN_SWITCH) == 0 ) {
digitalWrite(PIN_RELAY, HIGH);
} else {
digitalWrite(PIN_RELAY, LOW);
}
}