Raspberry Pi 3 と DSUN-PIR を使って人感センサーを作る + 人感センサー検知状況を表示する簡易Webアプリケーションを作る ref: http://qiita.com/na0AaooQ/items/a73e1fc944f818fd104d

example-pir-api.rb

require 'sinatra'
require 'sinatra/reloader'
require 'json'

PIR_STATUS_FILE = "/tmp/example-pir-status.log"
PIR_STATUS_FILE.freeze

get '/' do

  if File.exist?(PIR_STATUS_FILE)

    status = File.read(PIR_STATUS_FILE, :encoding => Encoding::UTF_8)
    status = status.chomp

    if status == "1" then
      room_status = "[リビングに人がいます] " + status + ""
    else
      room_status = "[リビングに人はいません] " + status + ""
    end

  else

    room_status = "[リビングの人感センサー検知状況を表示できません]"

  end

  room_status

end

post '/put' do
  body = request.body.read

  File.open(PIR_STATUS_FILE, "w") do |f| 
    f.puts(body);
  end

  if body == ''
    status 400
  else
    body.to_json
  end
end

file0.txt

root@raspberrypi:~# wpa_passphrase 無線LANのSSID SSIDのパスフレーズ >> /etc/wpa_supplicant/wpa_supplicant.conf

file1.txt

root@raspberrypi:~# cat /etc/wpa_supplicant/wpa_supplicant.conf
country=GB
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
network={
    ssid="SSID"
    psk=パスフレーズが暗号化されて設定される
}
root@raspberrypi:~# 

file10.txt

root@raspberrypi:~# cat /sys/class/gpio/gpio18/value 
0
root@raspberrypi:~# 

file11.txt

MacBookProPC001:~ user$ ssh -i EC2インスタンスログイン用のSSH秘密鍵 ec2-user@198.51.100.20
Last login: Sun Apr  2 23:29:03 2017 from i121-115-95-232.s42.a013.ap.plala.or.jp

       __|  __|_  )
       _|  (     /   Amazon Linux AMI
      ___|\___|___|

https://aws.amazon.com/amazon-linux-ami/2016.09-release-notes/
[ec2-user@example-ruby-sinatra-server ~]$ 

file12.txt

[ec2-user@example-ruby-sinatra-server ~]$ sudo su - 
最終ログイン: 2017/04/02 (日) 23:30:13 JST日時 pts/0
[root@example-ruby-sinatra-server ~]# groupadd sinatra
[root@example-ruby-sinatra-server ~]# useradd sinatra -g sinatra -d /home/sinatra -s /bin/bash
[root@example-ruby-sinatra-server ~]# 
[root@example-ruby-sinatra-server ~]# su - sinatra
[sinatra@example-ruby-sinatra-server ~]$ 
[sinatra@example-ruby-sinatra-server ~]$ id
uid=501(sinatra) gid=501(sinatra) groups=501(sinatra)
[sinatra@example-ruby-sinatra-server ~]$ 

file13.txt

[sinatra@example-ruby-sinatra-server ~]$ /sbin/ifconfig eth0 | grep inet
          inet addr:198.51.100.20  Bcast:198.51.100.255  Mask:255.255.255.0
          inet6 addr: XXXX::XXX:XXXX:XXXX:XXXX/64 Scope:Link
[sinatra@example-ruby-sinatra-server ~]$ 

file14.txt

[root@example-ruby-sinatra-server ~]# echo "sinatra ALL=(ALL) NOPASSWD:ALL" > /etc/sudoers.d/sinatra
[root@example-ruby-sinatra-server ~]# chown root:root /etc/sudoers.d/sinatra 
[root@example-ruby-sinatra-server ~]# chmod 644 /etc/sudoers.d/sinatra 
[root@example-ruby-sinatra-server ~]# 

file15.txt

[sinatra@example-ruby-sinatra-server ~]$ ruby -v
ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-linux]
[sinatra@example-ruby-sinatra-server ~]$ 

file16.txt

[sinatra@example-ruby-sinatra-server ~]$ ls -lrta /home/sinatra/
total 24
-rw-r--r-- 1 sinatra sinatra  124 Aug 16  2016 .bashrc
-rw-r--r-- 1 sinatra sinatra  193 Aug 16  2016 .bash_profile
-rw-r--r-- 1 sinatra sinatra   18 Aug 16  2016 .bash_logout
drwxr-xr-x 4 root    root    4096 Apr  2 23:31 ..
-rw------- 1 sinatra sinatra    8 Apr  2 23:31 .bash_history
drwx------ 2 sinatra sinatra 4096 Apr  2 23:31 .
[sinatra@example-ruby-sinatra-server ~]$ 

[sinatra@example-ruby-sinatra-server ~]$ mkdir /home/sinatra/example-pir-api
[sinatra@example-ruby-sinatra-server ~]$ 
[sinatra@example-ruby-sinatra-server ~]$ cd /home/sinatra/example-pir-api/
[sinatra@example-ruby-sinatra-server example-pir-api]$ pwd
/home/sinatra/example-pir-api
[sinatra@example-ruby-sinatra-server example-pir-api]$ 

file17.txt

[sinatra@example-ruby-sinatra-server example-pir-api]$ ls -lrta /home/sinatra/example-pir-api/
total 8
drwx------ 3 sinatra sinatra 4096 Apr  2 23:37 ..
drwxrwxr-x 2 sinatra sinatra 4096 Apr  2 23:37 .
[sinatra@example-ruby-sinatra-server example-pir-api]$ 
[sinatra@example-ruby-sinatra-server example-pir-api]$ bundle init
Writing new Gemfile to /home/sinatra/example-pir-api/Gemfile
[sinatra@example-ruby-sinatra-server example-pir-api]$ 
[sinatra@example-ruby-sinatra-server example-pir-api]$ ls -lrta /home/sinatra/example-pir-api/Gemfile 
-rw-r--r-- 1 sinatra sinatra 75 Apr  2 23:37 /home/sinatra/example-pir-api/Gemfile
[sinatra@example-ruby-sinatra-server example-pir-api]$ 
[sinatra@example-ruby-sinatra-server example-pir-api]$ echo "gem 'sinatra'" >> /home/sinatra/example-pir-api/Gemfile
[sinatra@example-ruby-sinatra-server example-pir-api]$ echo "gem 'sinatra-contrib'" >> /home/sinatra/example-pir-api/Gemfile
[sinatra@example-ruby-sinatra-server example-pir-api]$ echo "gem 'json'"    >> /home/sinatra/example-pir-api/Gemfile
[sinatra@example-ruby-sinatra-server example-pir-api]$ 

file18.txt

[sinatra@example-ruby-sinatra-server example-pir-api]$ cat /home/sinatra/example-pir-api/Gemfile
# frozen_string_literal: true
source "https://rubygems.org"

# gem "rails"
gem 'sinatra'
gem 'sinatra-contrib'
gem 'json'
[sinatra@example-ruby-sinatra-server example-pir-api]$ 

file19.txt

[sinatra@example-ruby-sinatra-server example-pir-api]$ pwd
/home/sinatra/example-pir-api
[sinatra@example-ruby-sinatra-server example-pir-api]$ ls -lrta /home/sinatra/example-pir-api/
total 12
drwx------ 3 sinatra sinatra 4096 Apr  2 23:37 ..
drwxrwxr-x 2 sinatra sinatra 4096 Apr  2 23:37 .
-rw-r--r-- 1 sinatra sinatra  122 Apr  2 23:39 Gemfile
[sinatra@example-ruby-sinatra-server example-pir-api]$ 
[sinatra@example-ruby-sinatra-server example-pir-api]$ bundle install --path vendor/bundle
Fetching gem metadata from https://rubygems.org/..........
Fetching version metadata from https://rubygems.org/.
Resolving dependencies...
Installing backports 3.7.0
Installing json 2.0.3 with native extensions
Installing multi_json 1.12.1
Installing rack 1.6.5
Installing tilt 2.0.7
Using bundler 1.13.2
Installing rack-protection 1.5.3
Installing rack-test 0.6.3
Installing sinatra 1.4.8
Installing sinatra-contrib 1.4.7
Bundle complete! 3 Gemfile dependencies, 10 gems now installed.
Bundled gems are installed into ./vendor/bundle.
[sinatra@example-ruby-sinatra-server example-pir-api]$ 

file2.txt

MacBookProPC001:~ user$ ssh pi@198.51.100.10
pi@198.51.100.10's password: -> piユーザの初期パスワード raspberry を入力します。

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Tue Mar 28 18:05:14 2017
pi@raspberrypi:~ $ 

file20.txt

[sinatra@example-ruby-sinatra-server example-pir-api]$ ls -lrta /home/sinatra/example-pir-api/
total 24
-rw-r--r-- 1 sinatra sinatra  122 Apr  2 23:39 Gemfile
drwxrwxr-x 2 sinatra sinatra 4096 Apr  2 23:39 .bundle
drwxrwxr-x 3 sinatra sinatra 4096 Apr  2 23:39 vendor
drwx------ 4 sinatra sinatra 4096 Apr  2 23:39 ..
-rw-rw-r-- 1 sinatra sinatra  568 Apr  2 23:39 Gemfile.lock
drwxrwxr-x 4 sinatra sinatra 4096 Apr  2 23:39 .
[sinatra@example-ruby-sinatra-server example-pir-api]$ 
[sinatra@example-ruby-sinatra-server example-pir-api]$ 

file21.txt

[sinatra@example-ruby-sinatra-server ~]$ vi /home/sinatra/example-pir-api/example-pir-api.rb 

file23.txt

[sinatra@example-ruby-sinatra-server example-pir-api]$ sudo /usr/local/rbenv/shims/bundle exec ruby /home/sinatra/example-pir-api/example-pir-api.rb -o 0.0.0.0 -p 80 &
[1] 4965
[sinatra@example-ruby-sinatra-server example-pir-api]$ [2017-04-03 00:28:03] INFO  WEBrick 1.3.1
[2017-04-03 00:28:03] INFO  ruby 2.3.1 (2016-04-26) [x86_64-linux]
== Sinatra (v1.4.8) has taken the stage on 80 for development with backup from WEBrick
[2017-04-03 00:28:03] INFO  WEBrick::HTTPServer#start: pid=4966 port=80

　-> Enterキーを押します。

file24.txt

[sinatra@example-ruby-sinatra-server example-pir-api]$ ps awux | grep -v grep | grep ruby
root      4965  0.0  0.4 186148  4452 pts/2    S    00:28   0:00 sudo /usr/local/rbenv/shims/bundle exec ruby /home/sinatra/example-pir-api/example-pir-api.rb -o 0.0.0.0 -p 80
root      4966  1.7  2.7 360380 28236 pts/2    Sl   00:28   0:00 ruby /home/sinatra/example-pir-api/example-pir-api.rb -o 0.0.0.0 -p 80
[sinatra@example-ruby-sinatra-server example-pir-api]$ 

file25.txt

root@raspberrypi:~# vi /root/scripts/put_gpio_status.sh 

file27.txt

root@raspberrypi:~# chmod 755 /root/scripts/put_gpio_status.sh
root@raspberrypi:~# 

file28.txt

root@raspberrypi:~# /root/scripts/put_gpio_status.sh &
[1] 1833
root@raspberrypi:~# 

file3.txt

pi@raspberrypi:~ $ sudo su - 
root@raspberrypi:~# 

file4.txt

root@raspberrypi:~# mkdir /root/scripts

file6.txt

root@raspberrypi:~# chmod 755 /root/scripts/start_gpio.sh 
root@raspberrypi:~# 

file7.txt

root@raspberrypi:~# /root/scripts/start_gpio.sh 
total 0
drwxr-xr-x 50 root root    0 Jan  1  1970 ..
-rwxrwx---  1 root gpio 4096 Mar 28 18:05 unexport
lrwxrwxrwx  1 root gpio    0 Mar 28 18:05 gpiochip100 -> ../../devices/platform/soc/soc:virtgpio/gpio/gpiochip100
lrwxrwxrwx  1 root gpio    0 Mar 28 18:05 gpiochip0 -> ../../devices/platform/soc/3f200000.gpio/gpio/gpiochip0
-rwxrwx---  1 root gpio 4096 Apr  2 13:56 export
drwxrwx---  2 root gpio    0 Apr  2 13:56 .
lrwxrwxrwx  1 root root    0 Apr  2 13:56 gpio18 -> ../../devices/platform/soc/3f200000.gpio/gpio/gpio18
root@raspberrypi:~# 

file8.txt

root@raspberrypi:~# cat /sys/class/gpio/gpio18/value 
0
root@raspberrypi:~# 

file9.txt

root@raspberrypi:~# cat /sys/class/gpio/gpio18/value 
1
root@raspberrypi:~# 

put_gpio_status.sh

#!/bin/sh

GPIO="18"
GPIO_VALUE="/sys/class/gpio/gpio$GPIO/value"
API="https://198.51.100.20/put"

SLEEP="2"

if [ ! -f $GPIO_VALUE ] ; then
  echo "$GPIO_VALUE not found."
  exit
fi

while :
do
  curl -H "Accept: text/plain" -X POST -d `cat $GPIO_VALUE` $API

  sleep $SLEEP
done

start_gpio.sh

root@raspberrypi:~# vi /root/scripts/start_gpio.sh 
#!/bin/sh

GPIO="18"

echo $GPIO > /sys/class/gpio/export

ls -lrta /sys/class/gpio/