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Python in raspberry pi
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.
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Python in raspberry pi
- 1. Python in RaspberryPi Sudar Muthu (@sudarmuthu) http://github.com/sudar http://hardwarefun.com
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- 6. Setup Python sudo apt-getinstall python-dev sudo apt-get install python-rpi.gpio
- 7. Set the statusof GPIO Pins https://github.com/sudar/raspberry-pi-sketches/blob/master/led-blink/led-blink.py
- 8. Set the statusof 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
- 9. Demo Let there beLight https://github.com/sudar/raspberry-pi-sketches/blob/master/led-blink/led-blink.py
- 10. Changing the brightnessof 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
- 11. Demo Can you seethe brightness changing? https://github.com/sudar/raspberry-pi-sketches/blob/master/led-blink/pwm.py
- 12. Reading the statusof 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
- 13. Reading the statusof the Pin https://github.com/sudar/raspberry-pi-sketches/blob/master/button-input/button-input.py
- 14. Demo What happens whenthe button is pressed? https://github.com/sudar/raspberry-pi-sketches/blob/master/button-input/button-input.py
- 15. Combining Input andOutput 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
- 16. Combining Input andOutput https://github.com/sudar/raspberry-pi-sketches/blob/master/button-and-led/button-and-led.py
- 17. Demo Let’s control theLED by pressing the button https://github.com/sudar/raspberry-pi-sketches/blob/master/button-and-led/button-and-led.py
- 18. What more canbe done?
- 19. More protocols • I2C •SPI • Serial
- 20. Interacting with webcam •“PyGame” provides easy interface • Can get fancy using “opencv” • Both USB and GPIO interface are supported
- 21. Distributed Computing • EachPi 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/
- 22. Limitations • No built-inAnalog 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
- 23. Best of twoworlds http://learn.adafruit.com/assets/3199 http://learn.adafruit.com/assets/2123
- 24. 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/
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