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Raspberry pi home automation idea

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shashi gautam

This document describes how to set up a Raspberry Pi-based home automation system that allows devices to be controlled remotely over the internet. It uses a Raspberry Pi with a relay circuit to control appliances connected to it. A PHP-based web interface runs on a server and stores state in text files. A Python script on the Pi reads the text files over HTTP to control the relay and devices accordingly. Setting up the system involves preparing HTML, PHP and text files on the server, building the relay circuit, and configuring the Raspberry Pi to run the Python script to interface with the server files and control the relay.

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Raspberry pi home automation idea
It is a concept where devices in our home or wherever they are , have the capability to communicate with each other via the internet web based using normal HTTP protocols , you will be able to control any appliance in your home from anywhere.
1.Raspberry Pi model B with memory card preloaded with an OS. 2.WiFi dongle . 3.USB keyboard. 4.HDMI monitor. 5.Device Controller module
1.PHP. 2.HTML/CSS. 3.Python. 4.Linux/Rasbian.
of two parts: 1.Server 2.Client.
Here,the server is the web interface consisting of buttons and UI (User Interface) that will allow you to turn ON/OFF a device. It consists of PHP files, Html files and a .txt file (to store data). The server usually stores information regarding the button press on the page (ON/OFF) on a .txt file.
his is a simple Html file called main.html ,consisting of two buttons. The clicking of the buttons will trigger the execution of a PHP file called button.php. This program serves as an API (Application Programming Interface) to store data on to a text file called button Status.txt. The data is a string : ON, if ON button is clicked and OFF, if OFF button is clicked. Thus the current button press state is recorded in the text file : buttonStatus.txt.
The client side consists of a Raspberry Pi with a relay circuit connected to its GPIO pin. The pi runs a python program which is used to Post a url link using urllib2. That is, the pi constantly reads the contents of a url link. Here, the url link is another PHP file called buttonStatus.php This PHP file serves as an API to read the contents of the text file buttonStatus.txt After reading the data, the python program checks if the string obtained is ON / OFF based on which it switches ON/OFF the relay respectively via its GPIO pin.
Step 1: Preparing the html, php files Step 2: Setting up the relay circuit for the Raspberry Pi home automation system Step 3: Setting up the Raspberry Pi
Here, the server side of the system has to be set up. If you are having your own domain, you can use the file manager service to drop these files into your server and can be used to control your IoT systems from anywhere around the world. The files to be put in your server are : main.html , button.php , buttonStatus.php and buttonStatus.txt , download them from here : DIY Hacking Raspberry Pi home automation system and extract it. The program raspbi.py is the python program which is to be copied to your raspberry pi.If you are new to html and php , dont worry. This project will need only a basic understanding of the two languages, spending some time on a few tutorials :HTML for beginners , PHP for beginners and reading the code would be su cient. The html file consists of a basic UI with two buttons. On button press, it triggers a PHP program which writes a string to a .txt files depending on the button pressed.The .txt le stores information of the last button state. However, if you dont have a domain, you can simulate a domain in your local network or wi using a service called xampp. It is very simple, the instructions for using it are here : Xampp Web Server Emulator Windows and Xampp Web Server Emulator Linux. Using xampp you can useyour pc as a local web server. However, the IoT systems gets con ned to a control range limited to your home wi network. Drop the html, php and .txt les into the /htdocs/xampp directory.
Step 2: Setting up the relay circuit for the Raspberry Pi home automation system A small relay circuit is to be made , to switch an appliance ON/OFF
Step 3: Setting up the Raspberry Pi If you have a brand new raspberry pi and are looking for instructions to load the OS into the SD card please follow this tutorial: Installing the OS for raspberry pi.The default OS used with the pi is the raspbian.To use the GUI for pi, use the command startx in the terminal. You can use an Edimax wi dongle for wireless connectivity, use the wi con g application in the desktop of your pi to scan and connect to the wi network.The raspberry pi is used to continually run a python program called raspbi.py , copy this le to your pi. Before executing this le , open the le using nano raspbi.py and edit the line that says : response=urllib2.urlopen(https://diyhacking.com/projects/IOTautomation/buttonStatus.php) by replacing the link within , by your own link generated either through xampp or your own domain.On using the command sudo python raspbi.py, it will initiate the program. You can use the raspberry pi without a monitor by using ssh. SSH (Secure Shell) can be used to control the pi remotely from a pc in the same home network, if you know the ip address of your pi. Use ifcon g command on your pi to nd the ip address. Use sudo /etc/init.d/ssh start to initiate the ssh service.Then, from a remote pc using putty software (for windows) , open the terminal and enter the command sudo ssh ipaddress -l pi , ipaddress is replaced with the actual ip address you obtained for the pi in the range 192.168.1.1 192.168.1.254.
Connect the relay circuit to the raspberry pi. You need to connect GPIO pin no : 5 and 6 (GND) to the circuit as in the schematic. Please note: Raspberry pi uses GPIO pins 5 and 6 to get into safe mode by shorting them together. Hence, please use any other GPIO other than 5 by editing the python program, to prevent booting into the safe mode

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Raspberry pi home automation idea

  • 2. It is a concept where devices in our home or wherever they are , have the capability to communicate with each other via the internet web based using normal HTTP protocols , you will be able to control any appliance in your home from anywhere.
  • 3. 1.Raspberry Pi model B with memory card preloaded with an OS. 2.WiFi dongle . 3.USB keyboard. 4.HDMI monitor. 5.Device Controller module
  • 4. 1.PHP. 2.HTML/CSS. 3.Python. 4.Linux/Rasbian.
  • 6. Here,the server is the web interface consisting of buttons and UI (User Interface) that will allow you to turn ON/OFF a device. It consists of PHP files, Html files and a .txt file (to store data). The server usually stores information regarding the button press on the page (ON/OFF) on a .txt file.
  • 7. his is a simple Html file called main.html ,consisting of two buttons. The clicking of the buttons will trigger the execution of a PHP file called button.php. This program serves as an API (Application Programming Interface) to store data on to a text file called button Status.txt. The data is a string : ON, if ON button is clicked and OFF, if OFF button is clicked. Thus the current button press state is recorded in the text file : buttonStatus.txt.
  • 8. The client side consists of a Raspberry Pi with a relay circuit connected to its GPIO pin. The pi runs a python program which is used to Post a url link using urllib2. That is, the pi constantly reads the contents of a url link. Here, the url link is another PHP file called buttonStatus.php This PHP file serves as an API to read the contents of the text file buttonStatus.txt After reading the data, the python program checks if the string obtained is ON / OFF based on which it switches ON/OFF the relay respectively via its GPIO pin.
  • 9. Step 1: Preparing the html, php files Step 2: Setting up the relay circuit for the Raspberry Pi home automation system Step 3: Setting up the Raspberry Pi
  • 10. Here, the server side of the system has to be set up. If you are having your own domain, you can use the file manager service to drop these files into your server and can be used to control your IoT systems from anywhere around the world. The files to be put in your server are : main.html , button.php , buttonStatus.php and buttonStatus.txt , download them from here : DIY Hacking Raspberry Pi home automation system and extract it. The program raspbi.py is the python program which is to be copied to your raspberry pi.If you are new to html and php , dont worry. This project will need only a basic understanding of the two languages, spending some time on a few tutorials :HTML for beginners , PHP for beginners and reading the code would be su cient. The html file consists of a basic UI with two buttons. On button press, it triggers a PHP program which writes a string to a .txt files depending on the button pressed.The .txt le stores information of the last button state. However, if you dont have a domain, you can simulate a domain in your local network or wi using a service called xampp. It is very simple, the instructions for using it are here : Xampp Web Server Emulator Windows and Xampp Web Server Emulator Linux. Using xampp you can useyour pc as a local web server. However, the IoT systems gets con ned to a control range limited to your home wi network. Drop the html, php and .txt les into the /htdocs/xampp directory.
  • 11. Step 2: Setting up the relay circuit for the Raspberry Pi home automation system A small relay circuit is to be made , to switch an appliance ON/OFF
  • 12. Step 3: Setting up the Raspberry Pi If you have a brand new raspberry pi and are looking for instructions to load the OS into the SD card please follow this tutorial: Installing the OS for raspberry pi.The default OS used with the pi is the raspbian.To use the GUI for pi, use the command startx in the terminal. You can use an Edimax wi dongle for wireless connectivity, use the wi con g application in the desktop of your pi to scan and connect to the wi network.The raspberry pi is used to continually run a python program called raspbi.py , copy this le to your pi. Before executing this le , open the le using nano raspbi.py and edit the line that says : response=urllib2.urlopen(https://diyhacking.com/projects/IOTautomation/buttonStatus.php) by replacing the link within , by your own link generated either through xampp or your own domain.On using the command sudo python raspbi.py, it will initiate the program. You can use the raspberry pi without a monitor by using ssh. SSH (Secure Shell) can be used to control the pi remotely from a pc in the same home network, if you know the ip address of your pi. Use ifcon g command on your pi to nd the ip address. Use sudo /etc/init.d/ssh start to initiate the ssh service.Then, from a remote pc using putty software (for windows) , open the terminal and enter the command sudo ssh ipaddress -l pi , ipaddress is replaced with the actual ip address you obtained for the pi in the range 192.168.1.1 192.168.1.254.
  • 13. Connect the relay circuit to the raspberry pi. You need to connect GPIO pin no : 5 and 6 (GND) to the circuit as in the schematic. Please note: Raspberry pi uses GPIO pins 5 and 6 to get into safe mode by shorting them together. Hence, please use any other GPIO other than 5 by editing the python program, to prevent booting into the safe mode