Raspberry pi projects

make it simple..

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Wednesday 2 November 2016

contolling LED bulb using raspberry pi 3

  03:29    


First experiment using led:

Hardware Requirements

             LED bulb
         1k ohm resistor
         2x female to male jumper wire
         breadboard
    anode(big leg) of the LED is connected  through resistor 
    in gpio pin 17 and cathode(small leg) of the led is connected 
    to ground(GND) of the gpio pin

    python program for control the led: 

     python has new gpiozero library to control the gpio pins according to the speific python programming paradigm. The following python program can be control the led bulb.                                                                                                                        
    from gpiozero import LED
    from time import sleep
    led=LED(17)
    while 1:
         led.on()
         sleep(1)
         led.off()
         sleep()


    in the above program LED module is imported from gpiozero library then sleep module is imported from time library for the purpose of led blink. led=LED(17) this specifies the led bulb connected to the gpio 17,  while 1: this line tells the condition is always true and running the program until the user terminate it.
       led.on() in this line on() function send the output signal to the          gpio 17 pin as on and then sleep(1) this fucntion tells wait for            one second and then off() fucntion send the output signal to the        gpio 17 pin as off, So that the led is blinking.

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Tuesday 1 November 2016

Introduction to GPIO in raspberry pi 3

  22:44    


GPIO pins:

GPIO stands for general purpose input output pin, there are 40 pins available in 
the raspberry pi 3 model b. 
which are used to control the external devices such as light,fan,motor 
and any electrical and electronic devices using the solid state relay module 
for the high voltage devices. 
It can be used to read the data from the sensor node such as temporature,
humidity,distance,ph value, moisture content and store to the database server, 
then process these data for the further analysis.


Gpio pins of the raspberry pi 3 is show in the  pic.

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mysql server and phpmyadmin installation in raspberry pi 3

  22:39    


INSTALL MYSQL DATABASE:

mysql is a open source database server to store the sructured data 
in the form of rows and columns. Issue the following command to 
install the mysql server and client.

sudo apt-get install mysql-server





set the password for mysql database.



If you want to be able to interact with MYSQL in Python you 

will need to install the Python bindings as well. 

You can do this by entering the following command.



sudo apt-get install python-mysqldbNow installed the phpmyadmin 


to access mysql databases in the user interface .






sudo apt-get install phpmyadmin
















select yes to configure phpmyadmim







we will also need to setup Apache to include our phpmyadmin installation. 



To do this enter










sudo nano /etc/apache2/apache2.conf



NOw at the bottom of this file enter the following line:








include /etc/phpmyadmin/apache.conf

 once done save & exit by pressing CTRL +x and then y







now restart the apache server using following command







sudo service apache2 restart







Now you can be able to access the phpmyadmin from a browser.







http://localhost/phpmyadmin or domainname/phpmyadmin.

























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web Server installation in raspberry pi 3



  22:19    





Server
installation: 





                              Apache
is a popular web server application you can install on the Raspberry
Pi to allow it to serve web pages.



On
its own, Apache can serve HTML files over HTTP, and with additional
modules can serve dynamic web pages using scripting languages such as
PHP.



INSTALL
APACHE WEB SERVER:









First
install the apache2
package
by typing the following command into the terminal:


sudo apt-get install apache2 -y










then
test the webserver using browser,put the following url in address bar



http://localhost
or 127.0.0.1 or your ip address. Following page will be displayed







f
you see this page, this means apache server is installed succesfully
on your raspberry pi 3.



/var/www/html/ is the defualt root directory of the webpages.






INSTALL PHP:


php is the server side scripting language, which is used to create a website dynamically.issue the following command on the terminal to install the php.



 
 
 








 
 
 








sudo apt-get install php5 libapache2-mod-php5 -y


now the php interpreter is installed successfully.


Now You can create a php file named index.php as 


a first dynamic page of your website. 


Copy the following php code and save as index.php 


inside the server directory that means /var/www/html/index.php

<?php 
echo "<center><h2>welcome to the raspberry pi world</h2></center>"; 
?>

then start the apahe2 webserver using the following command

service apache2 start

the open any web browser put the ip address or 


domain name of your raspberry pi.







 
 
 





Your first php page is displayed in the above pic.













 
 
 
























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DynamicDns and PortForwarding



  22:02    





DynamicDns
and PortForwarding:







The
ISP provides dynamic public ip address for every customer,  dynamic
means change the public ip address of our gateway or wifi router. So
that we can't access the remote Desktop of the raspberry pi from 
outsite the local network.







The
first way has the problem that a IP address is hard to remember. And,
if you reboot your router, the IP address will change and you will
have to give the new IP address to your friends, again. Very
unpractical. Having a domain is more user friendly, easy to remember
and does not change over time. The idea is that the domain in always
pointing to your public
IP.







To
resolve this problem, we should use dynamic dns,  there are several
sites provides these service called dynamic dns, Let us set Dynamic
Dns for our raspberry pi device.









First
goto this website http://ip.raspctl.com/
and register here with your email id

















in
tha above pic. Abutech is the subdomain of the raspctl.com







so
that after register, your domain name is yoursite.raspctl.com







in
my case my domain name is abutech.raspctl.com











now
install raspctl software for raspberry pi. So you put the following
commands on the terminal






wget debrepo.krenel.org/raspctl.asc

then

cat raspctl.asc | sudo apt-key add -

then






echo "deb http://debrepo.krenel.org/ raspctl main" | sudo tee /etc/apt/sources.list.d/raspctl.list







and
then update your pi usig following commands







sudo
apt-get update







then
install the software called raspctl-dynamicdns
using following commands










sudo apt-get install raspctl-dynamicdns

after all is done.

Now you shoud login to your dashboard http://ip.raspctl.com/

you can now see the following pic.












Copy
the UUID from dashboard. Then edit the configuration file







using
the following command











leafpad
/etc/raspctl/dynamic-dns.conf







now
paste the uuid to this configuration file.







Then
save it and exit. Put the following command to update your public ip
to the raspctl.com







sudo
raspctl-dynamicdns











Now
the dynamic dns is successfully installed on your raspberry pi 3.







portforwarding:







now
we should know about port forwarding, your public ip address is
nothing but your router ip address, so that any requests are coming
to your router only, not for your device. So that  we should
configure the router for forwarding any requests from the client to
your device.











Open
the router settings in browser using router's private ip, in my case
my router's private  ip addess is 192.168.1.1























configure
the router using your raspberry pi ip address then save it.



now the portforwarding is successfully configured.


























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update and upgrade raspberry pi 3



  21:51    





Update
and upgrade:









update
the repository of the raspberry pi for newly updated software
versions by the following command on the terminal 










sudo
apt-get update









then
upgrade the raspbian distribution  using the following command into
the terminal









sudo
apt-get dist-upgrade






















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Vnc viewer for pc



  21:47    









Download
the vnc viewer for windows from the following link










after
download the vnc viewer, open it











enter
the ip address of raspberry pi with default port 9500 of the vnc
server,then click connect.



















Now
enter the username as pi
password
as raspberry,
then
click ok















now
you can see the desktop of the raspberry pi.











You
can Operate the raspberry pi without external keyboard,monitor and
mouse.










































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remote desktop access of raspberry pi using android



  21:13    





Find
IP address of raspberry pi:







find
the ip address of your raspberry pi using the terminal command









open
terminal and put the command ifconfig press enter



















from
the above pic. The ip address of the raspberry pi is 192.168.1.69






 
 
 









now
you  download vnc viewer for android mobile from playstore or
download for pc to the remote desktop access.







VNC
viewer:











 
 
 






click
plus button sorrounded by green color







 
 
 






enter
the ip address of raspberry pi with default port 5900 of the VNC
server. Enter name any press create button.







 
 
 






Click
connect.







 
 
 






Click
continue 








 
 
 






enter
the username as pi and the password as raspberry click continue.







Now
you can see the desktop of the raspberry pi 3



 
 
 











 
 
 






now
you can operate and interact with your raspberry pi device with android phone and
without monitor, keynboard and mouse.







in next post i will do the same thing on my personal computer.






















































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Initial configurations of raspberry pi 3



  21:12    





Initial
configurations of raspberry pi 3:










After
installation of the operating system, your device is ready to use









first
time you want to connect raspberry pi  to monitor or smart tv using
HDMI cable for the pupose of first time configuration









first
connect keyboard and mouse to the usb board.











then
pluging HDMI cable and 5V power using your android  mobile charger to
the device, 


















 
 
 







then
it is automatically booting into the raspbian os, the following
screen appreared on the tv screen or monitor



















 
 
 








now
connect our raspberry pi device to network using wifi by entering the
password

















enter
the password of your wifi router, then click the button ok. Now
raspberry pi is connected to internet or local area network.









After
connected to the internet, now you should be configure VNC server for
remote desktop access to the raspberry pi









click
the menu botton, then select preferences and select raspberry pi
configuration



 
 
 
















 
 
 






you
can see the following screen







 
 
 






then
select interfaces tab on the menu of the current window







 
 
 






then
enable VNC interface and click ok,now you can able to control
your raspberry pi using your android mobile phone or pc by remote
Desktop.







in next tutorial i will show you how to use remote desktop using vnc.
















































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Install operating systems on raspberry pi SD card



  20:46    





operating
systems:




                               The
available operating systems for raspberry pi 3 are mentioned below









official
distribututions for raspberry pi 3 are NOOBS and RASPBIAN and the
third party operating systems are ubuntu mate,windows10 IoT
core,osmc,libreelec,pinet,risc os,wheather stations, the
recommended operating system is Raspbian for raspberry pi 3.the
raspbian os is based on debian linux operating system. If you like
to know about linux, see the following website
http://www.ee.surrey.ac.uk/Teaching/Unix/









Installation
of Raspian OS on SD card:









first
download the raspian os from  the following site
https://www.raspberrypi.org/downloads/raspbian/



then
extract the zip file to img file to be  write on  sd card and then
download the Win32Disk
imager utility from the below mentioned site
http://sourceforge.net/projects/win32diskimager/



then
open the win32disk imager utility, you can see the following screen











now
you need to insert the SD card to your pc using SD card reader, then
select the correct drive letter in the utility and then browse for
the img file of the raspbian os and finally you can click the write
button. You can goto relax and comeback after finishing the
installation.









 
 
 








After
finishing the writing process of the utility, reomve the sd card from
pc and put it on the raspberry pi 3 device, 8GB SD card is
recommended.











The
installation of the operating system is successfully completed.



 
 
 




































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introduction to raspberry pi



  20:37    





introduction
to raspberry pi:















Raspberry
pi is a pancard size single board micro computer, it is capable of
controlling the external electical and electronic devices such as
fan,LED bulb,tube light etc. It is also called as learning toy.it can
be used to perform wordprocessing and used as a personal computer.
Using this device we can create wireless sensor networks with zigbee
modules, and also create internet of things projects.















specification
of raspberry pi 3:



The
latest version of raspberry pi is raspberry pi 3 model b released on
29 February 2016. it consist of following components










    

  • 
A
 1.2GHz 64-bit quad-core ARMv8 CPU
    

    • 

  • 802.11n
 Wireless LAN 
    

    

    • 

  • Bluetooth
 4.1
    

 
    • 

  • Bluetooth
 Low Energy (BLE)
    

 the
 above mentioned components are  in raspberry pi 3 only
    • 




the
following components are in second versions of raspberry pi and also
raspberry pi 3


    

  • 1GB
 RAM
    

 
    • 

  • 4
 USB ports for connecting external keyboard,mouse and storage devices
 
 
    

 
    • 

  • 40
 GPIO(General purpose input output ) pins for connecting external
 devices such as LED bulb,sensors and home appliances
    

 
    • 

  • Full
 HDMI port for connecting to display or monitor
    • 





    

  • Ethernet
 port for connecting to internet or intranet
    

 
    • 

  • Combined
 3.5mm audio jack and composite video for connecting head phones and
 external speaker
    

 
    • 

  • Camera
 interface (CSI) for connecting to camera module 
 
    

 
    • 

  • Display
 interface (DSI) to mini display  for connecting raspberry pi mini
 display
    

 
    • 

  • Micro
 SD card slot (now push-pull rather than push-push) for secondary
 storage
    

 
    • 

  • VideoCore
 IV 3D graphics core for playing games and watching videos in good
 quality
    


    • 














in next post i will show you how to install operating system on raspberry pi 3
























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