// relay on off

const int relayPin= 8;
const int pulsante=10;
int stato=LOW;

void setup() {
  Serial.begin(9600);
  pinMode(relayPin,OUTPUT);  
  pinMode(pulsante, INPUT_PULLUP);           
             }



void loop() {
stato = digitalRead(pulsante);
if(stato == LOW)
digitalWrite(relayPin,HIGH);

if(stato == HIGH)
digitalWrite(relayPin,LOW);
    delay(100);
  Serial.println(stato,DEC);
  }