controlling bulb using gui in raspberry pi with python code and c code
TRANSCRIPT
8/10/2019 Controlling Bulb Using GUI in Raspberry Pi with python code and c code
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2014
Author: P N KIRAN
Email ID:[email protected]
Controlling Bulb using GUI in Raspberry pi
8/10/2019 Controlling Bulb Using GUI in Raspberry Pi with python code and c code
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Introduction:
This easy step by step guide will help you set up your raspberry pi and get
started with Controlling Bulb using GUI in Raspberry pi.
Hardware requriment:
Raspberry pi board
8GB sd card
blub
relay
12v power supply break out board
Software requriment :
Raspbian.
Raspberry pi:
The raspberry pi is a credit-card size computer that plugs into your TV and a keyboard.it is a
capbable little computer which can be used in electronics projects and for many of the things
that your desktop pc does,like spreadsheets, word-processing, games and it also plays high-
definition video. More info please click here
Relay:
A relay is an electrically operated switch. Many relays use an electromagnet to mechanically
operate a switch, but other operating principles are also used, such as solid-state relays. Relaysare used where it is necessary to control a circuit by a low-power signal (with complete
electrical isolation between control and controlled circuits), or where several circuits must be
controlled by one signal. The first relays were used in long distance telegraph circuits as
amplifiers: they repeated the signal coming in from one circuit and re-transmitted it on another
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circuit. Relays were used extensively in telephone exchanges and early computers to perform
logical operations. more info please click here
Pin out
A microcontroller's GPIO (general purpose input/output) pins cannot handle higher power
requirements. An LED was easy enough, but large power items such as light bulbs, toaster
ovens, and blenders required more sneaky circuitry. Something sneaky called a relay.
This board contains the relay, transistor, diode, resistor and activation LED. The board requires
5V and GND to operate.
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12v power supply break out board:
A power supply is an electronic device that supplies electric energy to an electrical load. The
primary function of a power supply is to convert one form of electrical energy to another and,
as a result, power supplies are sometimes referred to as electric power converters. Here we
provide one breakout board which supply you 3.3V,5V,12V for various applications
Booting with raspbian:
Step 1: Download the desired raspbian image from the downloads section of the raspberry
pi. for downloading this operating system please click here.
Step 2: SD card setup (copying the image to an SD card using on windows)
Extract the image file 2013-05-25-wheezy-raspbian.img from the downloaded .zip file.
Download the Win32DiskImager utility.
Extract the executable from the zip file and run the Win32DiskImager utility. You may
need to run the utility as Administrator
Insert the SD card into your SD card reader and check what drive letter it was assigned.
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You can easily see the drive letter (for example F:) by looking in the left column of
Windows Explorer.
If the card is not new, you should format it; otherwise Win32DiskImager may hang.
Select the 2013-05-25-wheezy-raspbian.img image file you extracted earlier
Select the drive letter of the SD card in the device box.
Be careful to select the correct drive; if you get the wrong one you can destroy your
computer's hard disk! .
Click Write
And wait for the write to complete.
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Exit the imager and eject the SD card.
Insert the card in the Raspberry Pi, power it on, and it should boot up. There is an option
in the configure script that comes up to expand the partitions to use all of the SD card if
you have used one larger than 4GB.
Default login and password
User name: pi
Password: raspberry
For entering GUI window type
pi@raspberrypi ~ $ startx
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Connect ethernet cabel to raspberry pi
Step 3 :
open a text editor by giving command as sudo nano led.py
led =is file name
.py=is python extention
Now we can write a python script that will on/off bulb using relay . Here’s the script to make that
happen:
The default keyboard settings are for a generic keyboard in a UK-style layout. If you want they
keys to do what they’re labeled to do. we can change the key board layout to US-style.
Give command as sudo nano /etc/defult/keybord make change as
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Code :
import RPi.GPIO as GPIO ## Import GPIO library
from time import sleep
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BOARD) ## Use board pin numbering
GPIO.setup(7, GPIO.OUT) ## Setup GPIO Pin 7 to OUT
while 1:
GPIO.output(7,True) #pin 7 is now high
sleep(2)
GPIO.output(7,False)#pin7 is now low
sleep(2)
Save the program press clt+x it will ask to save the changes type y and the press enter.
compile and run the program by giving command sudo python led.py
The code is pretty straight forward. It starts by initializing the GPIO library. Then it sets the
GPIO PIN7 to be an output. Next the code goes into an infinite loop. The loop turns the bulb off,
then sleeps for a second, then turns the bulb on, and finally sleeps for one second
Controlling BULB using GUI
For GUI based applications we have to install Tkinter
Tkinter: (Tk)
Python interface to GUI tool kit
The Tkinter module ("Tk interface") is the standard Python interface to the Tk GUI tool
kit from Scriptics (formerly developed by Sun Labs).
Both Tk and Tkinter are available on most Unix platforms, as well as on Windows and
Macintosh systems.
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The Tk interface is located in a binary module named _tkinter (this was tkinter in earlier
versions).
This module contains the low-level interface to Tk, and should never be used directly by
application programmers.
It is usually a shared library (or DLL), but might in some cases be statically linked withthe Python interpreter.
In addition to the Tk interface module, Tkinter includes a number of Python modules.
The two most important modules are the Tkinter module itself, and a module called
Tkconstants.
The former automatically imports the latter, so to use Tkinter, all you need to do is to
import one module:
Type the following command to activate Tkinter:
sudo apt-get install python python-tkidle python-pmwpython-imaging
open a text editor by giving command as sudo nano tkinter.py
code :
# -*- coding: utf-8 -*-import RPi.GPIO as GPIO
import sys
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BOARD)
GPIO.setup(7, GPIO.OUT)
from Tkinter import *
def ledon():
GPIO.output(7,True)
def ledoff():
GPIO.output(7,False)
root =Tk()
button1 = Button(root,fg= 'BLACK',text="ON",command=ledon)
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button2 = Button(root,fg= 'RED',text="OFF",command=ledoff)
button1.pack (side = LEFT )
button2.pack (side = RIGHT)
root.mainloop()
Save the program press clt+x it will ask to save the changes type y and the press enter.
compile and run the program by giving command sudo python tkinter.py then gui ON AND
OFF button will be pop up on you console pressing ON button on console blub will be glowing
pressing OFF button on console blub will be off state
For c code :
Download and Install
open a text editor and giving command as
WiringPi is now maintained under GIT for ease of change tracking,
If you do not have GIT installed, then under the Raspbian you can install it with:
sudo apt-get install git-core
If you get any errors here, make sure your Pi is up to date with the latest versions of Raspbian:
sudo apt-get update
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To obtain WiringPi using GIT:
git clone git://git.drogon.net/wiringPi
If you have already used the clone operation for the first time, then
cd wiringPi
Will fetch an updated version then you can run the build script below.
To build/install there is a new simplified script:
./build
open a text editor by giving command as sudo nano relay.c type a code
Code
#include <stdio.h>
#include <wiringPi.h>
// LED Pin - wiringPi pin 0 is BCM_GPIO 17.
#define LED 0
int main (void)
{
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printf ("Raspberry Pi blink\n") ;
wiringPiSetup () ;
pinMode (LED, OUTPUT) ;
for (;;)
{
digitalWrite (LED, HIGH) ; // On
delay (2000) ; // mS
digitalWrite (LED, LOW) ; // Off
delay (2000) ;
}
return 0 ;
}
Save the program clt+x it will ask to save the changes type y and the press enter.
compile the program by giving command gcc -Wall blink.c -o blink –lwiringPi
run the program by giving command ./blink
Then it sets the GPIO PIN11 to be an output. Next the code goes into an infinite loop. The loop
turns the bulb off, then sleeps for a second, then turns the bulb on, and finally sleeps for one
second
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