erlang

start() ->
    % Flash both LEDs red for 5 seconds
    [grisp_led:flash(L, red, 500) || L <- [1, 2]],
    timer:sleep(5000),
    % Randomly blink the first LED forever
    grisp_led:off(2),
    Random = fun() -> {bit(), bit(), bit()} end,
    grisp_led:pattern(1, [{100, Random}]).

bit() -> rand:uniform(2) - 1.

elixir

def start do
    :grisp_led.color(1, :blue)
end