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• Installing the script on your Raspberry Pi

  kd8ssf • 07/19/2014 at 17:15 • 0 comments

  There are many flavors of Linux available for the Raspberry Pi, so I will focus on the generic Raspbian build as well as one for Arch Linux. Why Arch? I am using MinePeon in my Bitcoin mining rig!

  Raspian:

  First, install git if you haven't already:

  sudo apt-get update

  sudo apt-get upgrade

  sudo apt-get install git-core

  Download wiringPi and install it:

  git clone git://git.drogon.net/wiringPi

  cd wiringPi

  ./build

  Create the shutdowncheck script:

  cd ~

  sudo nano shutdowncheck

  Type the following into the nano text editor:

  #!/bin/bash

  PATH=/usr/bin:/home/pi/wiringPi/gpio
  
  echo "Shutdown script starting..."
  echo "Asserting pins (7=in, low(pull-down); 8=out,high)"
  
  gpio -g mode 7 in
  gpio -g mode 7 down
  gpio -g write 7 0
  gpio -g mode 8 out
  gpio -g write 8 1
  
  COUNTER=0
  
  while [ 1 ]; do
  if [ "$(/home/pi/wiringPi/gpio/gpio -g read 7)" = "1" ]; then
  echo "PIN7 requested a SYSTEM HALT!"
  sudo halt -p
  break
  fi
  sudo sleep 0.5
  done
  exit 0

  After you have typed this in and double checked your work, press ctrl-o (to save) and ctrl-x (to exit).

  Next, make the script executable:

  sudo chmod 755 shutdowncheck

  Why type? Why can't I just pull it from your github? Because you can learn a bit about how gpio works on your pi by typing it manually. Also, some distros interpret new lines differently and you may end up with a non functioning script.

  Edit your /etc/rc.local file and add the following line before the last line (exit 0):

  sudo nano /etc/rc.local

  Add this line before exit 0:

  (cd /home/pi && exec ./shutdowncheck) &

  Save (ctrl-o) and exit nano (ctrl-x). Now your script will run automatically when your Pi starts up!

  Arch Linux (MinePeon specific instructions)

  Special thanks to synapseattack from bitcointalk.org for the MinePeon instructions!

  Download wiringPi and install it:

  git clone git://git.drogon.net/wiringPi

  cd wiringPi

  ./build

  sudo cp /home/minepeon/wiringPi/gpio/gpio /usr/bin/

  Create the shutdowncheck script:

  sudo nano /usr/bin/shutdowncheck

  Type the following into nano and then hit ctrl-o (save) and then ctrl-x (exit):

  #!/bin/bash
  PATH=/usr/bin
  
  echo "Shutdown script starting..."
  echo "Asserting pins (7=in, low(pull-down); 8=out,high)"
  
  gpio -g mode 7 in
  gpio -g mode 7 down
  gpio -g write 7 0
  gpio -g mode 8 out
  gpio -g write 8 1
  
  COUNTER=0
  
  while [ 1 ]; do
  if [ "$(/usr/bin/gpio -g read 7)" = "1" ]; then
  echo "PIN7 requested a SYSTEM HALT!"
  sudo halt -p
  break
  fi
  sudo sleep 0.5
  done
  exit 0

  Make the new file executable:

  sudo chmod +x /usr/bin/shutdowncheck

  Now make it a service:

  sudo nano /usr/lib/systemd/system/shutdowncheck.service

  Type this into nano (ctrl-o and ctrl-x to save and exit):

  [Unit]
  Description=ShutdownCheck
  ConditionFileIsExecutable=/usr/bin/shutdowncheck
  
  [Service]
  Type=forking
  ExecStart=/usr/bin/shutdowncheck
  TimeoutSec=0
  StandardOutput=tty
  RemainAfterExit=yes
  SysVStartPriority=99
  
  [Install]
  WantedBy=multi-user.target

  Now enable your new service:

  sudo systemctl enable shutdowncheck.service

  Now your script will run during boot (you will need to reboot after enabling the service).

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