/atxpi

Raspberry Pi ATX Power Controller

Primary LanguageEagleGNU General Public License v3.0GPL-3.0

atxpi

Raspberry Pi ATX power controller using the teensy microcontroller. The atxpi emulates ACPI behavior, handling ATX power supply states, power / reset buttons, and LEDs.

Parts List

Power / Reset Buttons

  • Power state 0:

    • Power button pressed: power on
    • Reset button pressed: do nothing

  • Power state 1:

    • Power button pressed for 1 second: Tell RPI to shutdown by setting GPIO pin 23 HIGH
    • Power button pressed for 5 seconds: Force power off
    • Reset button pressed for 1 second: Force power cycle

GPIO Pins

The RPI will monitor GPIO 23 and shutdown if it is set to HIGH. After the RPI boots it will set GPIO 24 HIGH, telling the teensy that the RPI is up. When GPIO 24 goes from HIGH to LOW the teensy will wait 5 seconds then cut power, unless GPIO 25 is HIGH. GPIO 25 is set to HIGH when the RPI is rebooting, preventing the teensy from cutting power when GPIO 24 changes from HIGH to LOW.

RPI Power Scripts Installation

Arch

Log into the RPI and become root. You will need to install git and WiringPi:

[root@alarmpi ~]$ pacman -Sy git wiringpi

Next, clone the repo and copy required files.

[root@alarmpi ~]$ git clone https://github.com/steelcaverobotics/atxpi.git
[root@alarmpi ~]$ mkdir /opt/atxpi
[root@alarmpi ~]$ cp atxpi/rpi_power_scripts/*.sh /opt/atxpi/
[root@alarmpi ~]$ chmod 755 /opt/atxpi/*.sh
[root@alarmpi ~]$ cp atxpi/service_files/arch/*.service /usr/lib/systemd/system/

Then enable the services, skipping atxpi-gpio-shutdown.service if you don't want the RPI to shutdown when the power button is pressed.

[root@alarmpi ~]$ systemctl enable atxpi-gpio-boot.service
[root@alarmpi ~]$ systemctl enable atxpi-gpio-reboot.service
[root@alarmpi ~]$ systemctl enable atxpi-gpio-shutdown.service

Finally, start the services. Do not start atxpi-gpio-reboot.service, as this will be started when the RPI is rebooting.

[root@alarmpi ~]$ systemctl start atxpi-gpio-boot.service
[root@alarmpi ~]$ systemctl start atxpi-gpio-shutdown.service

Raspbian

Log into the RPI and become root. You will need to install git and WiringPi:

root@raspberrypi:~# apt-get install git-core
root@raspberrypi:~# git clone git://git.drogon.net/wiringPi
root@raspberrypi:~# cd wiringPi/
root@raspberrypi:~# ./build

Next, clone the repo and copy required files.

root@raspberrypi:~# git clone https://github.com/steelcaverobotics/atxpi.git
root@raspberrypi:~# mkdir /opt/atxpi
root@raspberrypi:~# cp atxpi/rpi_power_scripts/*.sh /opt/atxpi/
root@raspberrypi:~# chmod 755 /opt/atxpi/*.sh
root@raspberrypi:~# cp atxpi/service_files/raspbian/* /etc/init.d/
root@raspberrypi:~# chmod 755 /etc/init.d/atxpi-gpio-*

Then enable the services, skipping atxpi-gpio-shutdown if you don't want the RPI to shutdown when the power button is pressed.

root@raspberrypi:~# update-rc.d atxpi-gpio-boot defaults
root@raspberrypi:~# update-rc.d atxpi-gpio-reboot defaults
root@raspberrypi:~# update-rc.d atxpi-gpio-shutdown defaults

Finally, start the services.

root@raspberrypi:~# /etc/init.d/atxpi-gpio-boot start
root@raspberrypi:~# /etc/init.d/atxpi-gpio-shutdown start

Schematic

atxpi schematic