Installing Library package in Raspberry Pi-Chapter 2

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Normally in every platform like windows, IOS or Linux based systems, we used to install applications or libraries based on our requirement. Since Raspberry Pi is a Linux based system, we need some application for example: Python for programming and libraries for example: urllib for the URL based programming functions.

To install such type of applications or Library packages, Click Terminal icon in the top of the Raspberry Pi window, the icon looks like below

Terminal icon on Raspberry Pi
Terminal icon

For installing Package, the APT command can be used, the apt-get command is available in every Linux based OS. If some package is not available in APT command, those Packages and libraries can be installed using PIP command (Python Package Index)

Now let’s see, how to give commands to install Application and libraries.

Every command should be typed in the Terminal, In every below command sudo resembles that “super user do”. If command is given by without “sudo” it shows “Permission denied” error

Normally pip is available in Raspbian, if there is no PIP in any other O version, open the terminal and type the following command in Terminal to install pip.

Terminal window
Terminal

To install PIP:

PIP for python2 - sudo apt-get install python-pip
PIP for python3 - sudo apt-get install python3-pip

To Update packages:

The below commands are for updating every applications or package which already installed.

sudo apt-get update 
sudo apt-get upgrade

To install  python3:

Python2 is available with Raspbian OS.

To install python3 in Raspberry Pi

sudo apt-get install python3

To install OpenCV in Raspberry Pi for python2 in single command:

sudo apt-get install libopencv-dev python-opencv

To install OpenCV in Raspberry Pi for python3 in single command:

sudo apt install libqtgui4
sudo apt install libqt4-test
sudo pip3 install opencv-python

To use Camera in Raspberry Pi:

fswebcam is needed to handle camera related applications

sudo apt-get install fswebcam

To use MQTT Protocol in Raspberry Pi:

Message Queuing telemetry Transport library to use mqtt protocol based applications

sudo pip install paho-mqtt

Pyautogui:

Pyautogui Library is for mouse and keyboard related function without accessing physically, we can able to access through python code using pyautogui library. Visit pyautogui cheat sheet for more mouse and keyboard related functions.

Pyautogui for python 2 - sudo pip2 install pyautogui
Pyautogui for python 3 - sudo pip3 install pyautogui

Tkinter:

For GUI based application, ex: creating a graphical view like virtual keyboard using push-buttons, text box etc.

sudo apt-get install python3-tk

if it ask for Xlib library enter the below command

Xlib:

sudo pip3 install Xlib

Voice output in Raspberry Pi:

There are two voice output that we can use in Raspberry Pi

espeak voice output:

sudo at-get install espeak

Festival voice output:

sudo apt-get install festival

Python code to use espeak and festival

import espeak
import festival
import subprocess
data="Hai Pantech"
subprocess.call(["espeak",data]) #for espeak
subprocess.call('echo '+data+'|festival --tts', shell=True)

pyQT4:

It is also GUI based designing for Raspberry Pi

pyQt4 for python2 -  sudo apt-get install python-qt4
pyQt4for python3  -  sudo apt-get install python3-qt4

if it shows import error in qwt5, then enter below command

sudo aptitudeinstall python-qwt5-qt4

To use Raspberry Pi on Laptop using Remote desktop in Windows:

sudo apt-get install xrdp

After Installing xrdp, we have to enable SSH. For that Click Raspberry Pi logo presented in top left corner, then choose preferences, select Rpi configurations, then enable SSH which presented in Interfaces tab by clicking at radio button and then click OK to reboot the system.In short term(Rpi logo-Preferences-Rpi configurations-Interfaces(tab)-enable SSH)

After rebooted, connect the Raspberry Pi to the network, as a result you will get local IP address of the Raspberry Pi when you place the cursor on wi-fi icon as shown in the figure below.

Local IP in wi-fi icon

Now open Remote desktop icon in Raspberry Pi, then enter the IP address of the Raspberry Pi, here for example : 192.168.1.17 as shown below

Remote desktop in windows

Now click Connect, It will ask for confirmation, Click Yes. Then It will prompt for username and password, Enter the username and password (Default username: pi) and password: raspberry. click OK to open the Raspberry pi virtually in windows.

To Preview Camera:

sudo apt-get install luvcview

After installing luvcview, open Terminal and type luvcview.  Highly used to adjust the camera focus

To configure Serial communication in Raspberry Pi:

Normally Serial communication is enabled to use GPS/GSM/RFID like serial based hardware interfaces and also serially actuated applications . First type the below commands in terminal

sudo nano /boot/cmdline.txt

After the above command executed, It opens the window as shown below. Delete the whole commands and replace with below commands

dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwaitdtoverlay=pi3-disable-bt

Press ctrl+X , then press Y to choose Yes, and click Enter to return to Terminal. Then type below command in Terminal

sudo nano /boot/config.txt

Add below commands to the current window 

dtoverlay=pi3-disable-bt
enable_uart=1

Press ctrl+X, then press Y to choose Yes, and Click Enter to return to Terminal, then type below command to reboot the Raspberry Pi

sudo reboot

After reboot, Serial will be enabled which is identified by Bluetooth is disabled. Generally either Serial or Bluetooth can be enabled at a time.

To open browser in Raspberry Pi from python code:

sudo apt-get install midori

Python code to open midori 

import subprocess
choice="http://192.168.1.17/GPIO.php"
subprocess.Popen(["midori","-a",choice])

Change the URL, to open in browser in the choice variable. for example: choice=”http://www.pantechsolutions.net”

Webpage using Raspberry Pi:

Type the below commands in order to install webpage application with PHP

sudo apt-get install apache2
sudo apt-get install php libapache2-mod-php
sudo apt-get install git-core
git clone git://git.drogon.net/wiringPi
cd wiringPi
./build

Now open terminal and enter the below command to create php  application file in root folder to control appliances or to display sensor values through webpage

cd /var/www/html

Below enter name in the form of php extension as shown

sudo leafpad gpio.php

It will open leafpad to enter the PHP code. Type your PHP code in that leafpad and close it after saving it.

To open, this PHP page through your Webpage . Note down the local IP address as shown above. then open browser in PC/Mobile and connect the device with same network which raspberry pi is connected. then in browser URL tab, Type below URL in webpage. Below here IP and PHP file name may vary

192.168.2.26/gpio.php

To use Google smart sheet in Raspberry pi :

Gspread: 

Gspread library is used for accessing google smart sheet from Raspberry pi python to update sensor values, which can be further used for machine learning process from the cloud

sudo pip install gspread

oauth2client:

oauthclient library is used to access the cloud resources which having oauth client such as Google API

sudo pip install --upgrade oauth2client

PyOpenSSL:

sudo pip install PyOpenSSL

To install Matplotlib for plotting 2D graphs in Raspberry Pi using python script:

sudo pip install matplotlib

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