pi.thermostat

Python and PHP code for Raspberri PI based web-enabled thermostat.

• Can run in standalone mode using bottle python web framework.
• Standalone server-only mode to provide API for third-party clients (web, app, IoTs, etc)
• Can be deployed on more robust web server such as Apache, Lighttpd or other web servers which supports WSGI. Can be deployed with UI or in sevrer-only mode.

1. Hardware

• Raspberri PI 3B with power adapter
• DHT22 Themperature sensor - https://www.amazon.com/gp/product/B073F472JL
• DC 5V Relay Module - https://www.amazon.com/gp/product/B07YRYBLSZ
• Breadboard jumper wires (Female-Female) - https://www.amazon.com/gp/product/B07GD2BWPY

2. Software Prerequisite

• Raspbian OS
• Apache2
• Python 2.7 (tested on 2.7.16, but should work with Python3)
• RPi.GPIO Python module (https://pypi.org/project/RPi.GPIO/)
• Adafruit_DHT Python module (https://github.com/adafruit/Adafruit_Python_DHT)
• (optional) WiringPi (http://wiringpi.com/) - comes PRE-INSTALLED with standard Raspbian desktop system. For "Raspbery OS Lite" install using "sudo apt install wiringpi"

3. Installation instructions

Gernerate pin code hash

python auth.py genhash "pin code"

example:

python auth.py genhash 1111

Create cron job

sudo crontab -e 

add following command. Replace "app directory" with your working directory

* * * * * python "app directory"/proc.py >> "app directory"/proc.log 2>&1

Standalone:

This installation allows you to run thermostat using included "bottle" web server and doesn't require Apache, Lighttpd or other web servers installed. It is single-threaded and slow, but a good choice for a simple and quick setup if light use is excpected.

1. Initialize GPIO on startup and start bottle web server

sudo nano /etc/rc.local

with UI

add following command before exit(0)

python "app directroy"/client.py >> <app directory>/web.log 2>&1

standalone SERVER-ONLY

python "app directroy"/server.py >> <app directory>/web.log 2>&1

restart RPI

sudo reboot 

Advanced (with Apache2 server):

This installation allows you to run thermostat with Apache, Lighttpd or other web servers which supports WSGI.

1. Initialize GPIO on startup

sudo nano /etc/rc.local

add following command before exit(0)

python <APP DIRECTORY>/thermostat.py init >> <APP DIRECTORY>/thermostat.log 2>&1

Also, make sure user that user account Apache server is running as (usualy www-data) is added to gpio group

sudo usermod -aG gpio www-data 

2. Configure WSGI on Apache2 sevrer

Install WSGI module for Apcahe2

 sudo apt install libapache2-mod-wsgi

Make sure WSGI mode is enabled

sudo a2enmod wsgi

3. Configure Apache2

Create thermostat.conf file at /etc/apache2/sites-available and add following configuration (repalce application path and port to the one you use)

<VirtualHost *:81>
    ServerName pi.thermostat.rpi3b.local
    ServerAdmin admin@localhost

    DocumentRoot /home/pi/apps/pi.thermostat
    ErrorLog /home/pi/apps/apache_error_81.log
    CustomLog /home/pi/apps/apache_access_81.log combined

    WSGIDaemonProcess pi.thermostat user=www-data group=www-data processes=1 threads=5
    WSGIScriptAlias / /home/pi/apps/pi.thermostat/app.wsgi

	<Directory /home/pi/apps/pi.thermostat>
		WSGIProcessGroup pi.thermostat
		WSGIApplicationGroup %{GLOBAL}
		Order deny,allow
		Allow from all
		Options Indexes FollowSymLinks
		AllowOverride All
		Require all granted
	</Directory>
</VirtualHost>

Enable thermostat web site

sudo a2ensite thermostat