Using GPIOs at boot time

How to use GPIO at boot time

e.g. for blinking LEDs or status LED

Usually it takes the Raspberry some 10 seconds to boot up and execute some customisation scripts to run. But there is an easy way to set GPIOs early in the loading process. e.g. to enable GPIO12 in /boot/config.txt add the line

#Set GPIO12 to be an output set to 1
gpio=12=op,dh

This will enable GPIO12 in the first seconds after power on. It will stay that way until Raspbian is ready and an other script changes GPIO settings.

Source: GPIO control in config.txt - Raspberry Pi Documentation

If you like Phoniebox, consider: buy me a coffee or PayPal

Code: https://github.com/MiczFlor/RPi-Jukebox-RFID
Phoniebox home page: English | Deutsch

Phoniebox is a contactless jukebox for the Raspberry Pi, playing audio files, playlists, podcasts, web streams and spotify triggered by RFID cards. All plug and play via USB, no soldering iron needed. Update: if you must, it now also features a howto for adding GPIO buttons controls.

Visit Phoniebox.de