// relay on off

const int relayPin= 8;
const int pulsante=10;
int stato=LOW;
int count,flag=0;
void setup() {
  Serial.begin(9600);
  pinMode(relayPin,OUTPUT);  
  pinMode(pulsante, INPUT_PULLUP);           
             }



void loop() {
  
stato = digitalRead(pulsante);
flag=count++%2;
if(stato == LOW && flag == 0)
{
digitalWrite(relayPin,HIGH);
}
else 

if(stato == LOW && flag == 1)
{

digitalWrite(relayPin,LOW);
  }
  }