local GPIO = require('periphery').GPIO
local clock = os.clock
local gpio_4 = GPIO(4, "out")

function sleep(n)
	local t0 = clock()
	while clock() - t0 <= n do end
end

--function wait(seconds)  -- This function doesnt give real seconds
--    local start = os.time()
--    repeat until os.time() > start + seconds
--end

while 1
	do
		gpio_4:write(0)
		sleep(2)
--		wait(2)

		gpio_4:write(1)
		sleep(0.2)
--		wait(0.2)
	end