# LED

This example shows how to use BaremetalPi.jl to blink a LED. First, connect a LED to the GPIO #4 of the Raspberry Pi as shown in the following figure.

Warning

We are using the Raspberry Pi Zero W as an example. You must modify it according to your model.

After that, the following code turn on the LED during 0.5s and then turn it off during another 0.5s indefinitely:

using BaremetalPi

# Initialize the GPIOs.
init_gpio()

# Make sure that the GPIO #4 is set as output.
gpio_set_mode(4, :out)

end