local pin = 7  -- GPIO13
local status = gpio.LOW
local delaay = 1000  --1 segundo

gpio.mode(pin, gpio.OUTPUT)
gpio.write(pin, status)

tmr.alarm(0, delaay, 1, function()
     if status == gpio.LOW then
      status = gpio.HIGH
     else
      status = gpio.LOW
     end
     gpio.write (pin, status)
    end)