#define pinled 3
#define pinbt 2
boolean status = false;


void setup() {
  pinMode (pinled, OUTPUT);
  pinMode(pinbt, INPUT_PULLUP);
  Serial.begin(9600);
}

void loop() {
  if (digitalRead(pinbt)==0){
    delay(100);
    status = ! status;
    digitalWrite(pinled, status);
  }
}