Python in raspberry pi

Aug 31, 2013Download as pptx, pdf

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The document discusses using Python on the Raspberry Pi to control the general purpose input/output (GPIO) pins. It provides examples of blinking an LED, changing an LED's brightness, reading the status of a button pin, and controlling an LED based on a button press. Additional topics that could be explored using Python on the Raspberry Pi include using I2C, SPI and serial protocols, interfacing with a webcam, distributed computing across multiple Pis, and combining the Pi with Arduino. Limitations of using the Pi's GPIO include a lack of analog inputs and inability to directly power motors.

Python in Raspberry Pi
Sudar Muthu (@sudarmuthu)
http://github.com/sudar
http://hardwarefun.com

Basic Electronics
http://en.wikipedia.org/wiki/File:OhmsLaw.svg

GPIO Pins
http://learn.adafruit.com/assets/3052

Setup Python
sudo apt-get install python-dev
sudo apt-get install python-rpi.gpio

Set the status of GPIO Pins
https://github.com/sudar/raspberry-pi-sketches/blob/master/led-blink/led-blink.py

Set the status of GPIO Pins
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BOARD)
GPIO.setup(12, GPIO.OUT)
try:
while True:
GPIO.output(12, GPIO.HIGH)
time.sleep(1)
GPIO.output(12, GPIO.LOW)
time.sleep(1)
finally:
GPIO.cleanup()
https://github.com/sudar/raspberry-pi-sketches/blob/master/led-blink/led-blink.py

Demo
Let there be Light
https://github.com/sudar/raspberry-pi-sketches/blob/master/led-blink/led-blink.py

Changing the brightness of the LED
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BOARD)
GPIO.setup(12, GPIO.OUT)
p = GPIO.PWM(12, 50) # channel=12 frequency=50Hz
p.start(0)
try:
while True:
for dc in range(0, 101, 5):
p.ChangeDutyCycle(dc)
time.sleep(0.1)
for dc in range(100, -1, -5):
p.ChangeDutyCycle(dc)
time.sleep(0.1)
finally:
p.stop()
GPIO.cleanup()
https://github.com/sudar/raspberry-pi-sketches/blob/master/led-blink/pwm.py

Demo
Can you see the brightness changing?
https://github.com/sudar/raspberry-pi-sketches/blob/master/led-blink/pwm.py

Reading the status of the Pin
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BOARD)
GPIO.setup(11, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
try:
while True:
if GPIO.input(11):
print "Button is on"
else:
print "Button is off"
time.sleep(0.1)
finally:
GPIO.cleanup()
https://github.com/sudar/raspberry-pi-sketches/blob/master/button-input/button-input.py

Reading the status of the Pin
https://github.com/sudar/raspberry-pi-sketches/blob/master/button-input/button-input.py

Demo
What happens when the button is pressed?
https://github.com/sudar/raspberry-pi-sketches/blob/master/button-input/button-input.py

Combining Input and Output
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BOARD)
GPIO.setup(11, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
GPIO.setup(12, GPIO.OUT)
try:
while True:
if GPIO.input(11):
print "Button is on"
GPIO.output(12, 1)
else:
GPIO.output(12, 0)
time.sleep(0.1)
finally:
GPIO.cleanup()
https://github.com/sudar/raspberry-pi-sketches/blob/master/button-and-led/button-and-led.py

Combining Input and Output
https://github.com/sudar/raspberry-pi-sketches/blob/master/button-and-led/button-and-led.py

Demo
Let’s control the LED by pressing the button
https://github.com/sudar/raspberry-pi-sketches/blob/master/button-and-led/button-and-led.py

Interacting with webcam
• “PyGame” provides easy interface
• Can get fancy using “opencv”
• Both USB and GPIO interface are supported

Distributed Computing
• Each Pi can be used as cheap node
• Form grids using a cluster of Pi’s
• Can share CPU, memory and disk space
http://www.cl.cam.ac.uk/projects/raspberrypi/t
utorials/distributed-computing/

Limitations
• No built-in Analog to Digital support
• Can’t run Inductive load (motors)
• Is not real-time (CPU might be busy)
• No “safe circuits” present
• Operates at 3.3V and is not directly
compatible with Arduino voltage

Best of two worlds
http://learn.adafruit.com/assets/3199 http://learn.adafruit.com/assets/2123

Links
• Source code -
https://github.com/sudar/raspberry-pi-sketches/
• My blog - http://hardwarefun.com
• Python GPIO -
https://code.google.com/p/raspberry-gpio-
python/
• Distributed computing using Pi -
http://www.cl.cam.ac.uk/projects/raspberrypi/tu
torials/distributed-computing/

Thank you
Sudar Muthu
http://hardwarefun.com

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Raspberry Pi ppt.pptxushabharathisb1

Raspberry Pi is a small, low-cost single-board computer that supports embedded Linux operating systems. It is about 9x6cm in size and costs $35 or more. The recommended operating system is Raspberry Pi OS, which is Linux-based. Raspberry Pi can be used for prototyping, data logging, electronics projects, and learning programming skills. It has GPIO pins for connecting sensors and components like LEDs. Python is often used with Raspberry Pi for programming and interacting with the GPIO pins.

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