RaspberryPi initial configuration

1. Configure SSH server

sudo systemctl enable ssh
sudo systemctl start ssh

2. Setup POWER BUTTON

 The GPIO3 and GND is used for POWER button, which is pin5 and pin6. 

Make button:

Create power.py script:

sudo vi power.py

#!/usr/bin/env python

import RPi.GPIO as GPIO
import subprocess


GPIO.setmode(GPIO.BCM)
GPIO.setup(3, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.wait_for_edge(3, GPIO.FALLING)

subprocess.call(['shutdown', '-h', 'now'], shell=False)

Next make this script run on boot

sudo mv power.py /usr/local/bin/
sudo chmod +x /usr/local/bin/power.py

Create another script to start/stop the script power.sh :

sudo vi power.sh

#! /bin/sh

### BEGIN INIT INFO
# Provides:          power.py
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
### END INIT INFO

# If you want a command to always run, put it here

# Carry out specific functions when asked to by the system
case "$1" in
  start)
    echo "Starting power.py"
    /usr/local/bin/power.py &
    ;;
  stop)
    echo "Stopping power.py"
    pkill -f /usr/local/bin/power.py
    ;;
  *)
    echo "Usage: /etc/init.d/power.sh {start|stop}"
    exit 1
    ;;
esac

exit 0

Also make it executable. Place it in /etc/init.d

sudo mv power.sh /etc/init.d/
sudo chmod +x /etc/init.d/power.sh

Now register script to run on boot

sudo update-rc.d power.sh defaults

Start the script

sudo /etc/init.d/power.sh start

# This if information is taken from https://howchoo.com/g/mwnlytk3zmm/how-to-add-a-power-button-to-your-raspberry-pi?utm_source=youtube&utm_medium=referral&utm_campaign=power-button-video&utm_content=description

3. WIFI configuration

As a regulatory Raspberry OS requires to set country for wifi utilization, thus we need to set it up:

sudo raspi-config

follow up and choose "US america" for example. Then create PSK(PreSharedKey) from SSID and PASSWORD by running following command:

    sudo su

    wpa_passphrase "MyWIFI" "MyPASSWord" >> /etc/wpa_supplicant/wpa_supplicant.conf

The output should be like:

network={

        ssid="MyWIFI"

        #psk="MYPASSWord"

        psk=6ffa0771c5e58c89dfceaf58a7370e569579a156f8b411c7e81039cd7249982f

}

Lastly run :

wpa_cli -i wlan0 reconfigure

If you have multiple choice of WIFI, like home and school wifi, then config can be as follows:

network={
    ssid="HomeOneSSID"
    psk="passwordOne"
    priority=1
    id_str="homeOne"
}

network={
    ssid="HomeTwoSSID"
    psk="passwordTwo"
    priority=2
    id_str="homeTwo"
}