Arduino.ino

int EI, cont=0, media=512;
const byte led = 3;
const byte botao = 4;
bool state = false;

void setup(){
  pinMode( led, OUTPUT );
  pinMode( botao, INPUT );
  digitalWrite( led, LOW );
}

void loop()
{
  if( !state ) EI = analogRead(A1);

  if( EI < media && !state )
    cont+=25;
  else
    cont = 0;

  if( cont >= 5000 && !state ){
    digitalWrite( led, HIGH );
    state = true;
  }

  if( state ){
    if( digitalRead( botao ) == HIGH ){
      state = false;
      digitalWrite( led, LOW );
      cont = 0;
    }
  }

   delay (25);
}