int botton=8,foco=7
void setup() 
{pinMode(botton,INPUT);
serial.begin(9600);
pinMode(foco,OUTPUT);

}
int estado;
void loop()
 {estado=digitalRead(botton);}
digitalWrite();
if(estado==HIGH)
{digitalWrite(foco,HIGH);
delay(200);}
if(estado==(LOW)
{digitalWrite(foco,LOW);
delay(200);}