Teach, Learn and Make with Raspberry Pi - Estonia seminar

Exploring teaching computing and informatics through physical computing with the Raspberry Pi

Transcript

1. Teach, Learn and Make with Raspberry Pi Ben Nuttall Raspberry Pi Foundation UK Charity 1129409
2. Raspberry Pi Foundation • Registered UK charity 1129409 • Founded in 2009 to aid computing education • On general sale since 2012, available to all worldwide – Sold to education, industry and hobbyists – Sold 6 million to date • Free learning resources for makers and educators • Free teacher training - Picademy (currently UK, soon USA)
3. Ben Nuttall • Education Developer Advocate at the Raspberry Pi Foundation – Software & project development – Learning resources & teacher training – Outreach • Hobbyist turned employee • Based in Cambridge, UK • @ben_nuttall on Twitter
4. Raspberry Pi • Sonic Pi • Python • Physical computing • Minecraft: Pi Edition • Picamera • Astro Pi
5. Sonic Pi • Sound synthesiser for creating music • Audible computing • Uses simple syntax text-based programming language Ruby • Used for compositions and live coding performances • Introduce computing concepts through music • Created especially for education
6. Python • Powerful extensible programming language • Easy to read and write • Make software, games, GUIs, websites, robots and more • Ideal for physical computing • Extensive library of additional modules for Raspberry Pi hardware • Recommended for education
7. Physical computing • Flashy lights • Motors & robots • Photo & video • Sensors • Internet of Things • Engaging and empowering
8. 3V3 = always on
9. GPIO = user controllable
10. Flash LED with Python from RPi import GPIO from time import sleep GPIO.setmode(GPIO.BCM) led = 2 GPIO.setup(led, GPIO.OUT) while True: GPIO.output(led, True) sleep(1) GPIO.output(led, False) sleep(1)
11. Traffic Lights from RPi import GPIO from time import sleep GPIO.setmode(GPIO.BCM) red = 9 yellow = 10 green = 11 leds = [red, yellow, green] for led in leds: GPIO.setup(led, GPIO.OUT) GPIO.output(green, True) GPIO.output(yellow, False) GPIO.output(red, False)
12. Traffic Lights while True: sleep(10) GPIO.output(green, False) GPIO.output(yellow, True) sleep(1) GPIO.output(yellow, False) GPIO.output(red, True) sleep(10) GPIO.output(yellow, True) sleep(1) GPIO.output(green, True) GPIO.output(yellow, False) GPIO.output(red, False)
13. An alternative approach class LED(object): def __init__(self, pin): self.pin = pin GPIO.setup(pin, GPIO.OUT) def on(self): GPIO.output(self.pin, True) def off(self): GPIO.output(self.pin, False) red = LED(9) yellow = LED(10) green = LED(11)
14. An alternative approach green.on() yellow.off() red.off() while True: sleep(10) green.off() yellow.on() sleep(1) yellow.off() red.on() sleep(10) yellow.on() sleep(1) green.on() yellow.off() red.off()
15. Traffic Lights green.on() yellow.off() red.off() sleep(10)
16. Traffic Lights green.off() yellow.on() sleep(1)
17. Traffic Lights yellow.off() red.on() sleep(10)
18. Traffic Lights yellow.on() sleep(1)
19. Traffic Lights green.on() yellow.off() red.off()
20. Minecraft: Pi Edition • Free version of Minecraft on Raspberry Pi • Python programming interface • Learn Python by building things and making games in Minecraft • Creative computing
21. Flowers from mcpi.minecraft import Minecraft from time import sleep mc = Minecraft.create() flower = 38 while True: x, y, z = mc.player.getPos() mc.setBlock(x, y, z, flower) sleep(0.1)
22. Planting flowers grass = 2 flower = 38 while True: x, y, z = mc.player.getPos() # player position (x, y, z) block_beneath = mc.getBlock(x, y­1, z) # block ID if block_beneath == grass: mc.setBlock(x, y, z, flower) else: mc.setBlock(x, y­1, z, grass) sleep(0.1)
23. Picamera • Official Raspberry Pi camera module • Command line interface for basic use • Python programming interface for projects • Still pictures, video, time- lapse
24. Camera preview • Open Terminal window • raspistill -k
25. Python – take a selfie from picamera import PiCamera from time import sleep with picamera.PiCamera() as camera: camera.start_preview() sleep(5) camera.capture('/home/pi/image.jpg') camera.stop_preview()
26. Python – stop motion with picamera.PiCamera() as camera: camera.start_preview() frame = 1 while True: next = input('Press Enter to continue...') camera.capture('/home/pi/animation/frame%03d.jpg' % frame) frame += 1
27. Astro Pi
28. Sense HAT • 8x8 RGB LED matrix • Mini joystick • Gyroscope • Accelerometer • Magnetometer • Temperature sensor • Barometric pressure sensor • Humidity sensor
29. Sense HAT - Python from sense_hat import SenseHat sense = SenseHat() sense.show_message('Hello world!')
30. More examples https://github.com/RPi­Distro/python­sense­ hat/tree/master/examples https://github.com/bennuttall/sense­hat­examples
31. Resources https://www.raspberrypi.org/resources/
32. Teach, Learn and Make with Raspberry Pi Ben Nuttall Raspberry Pi Foundation UK Charity 1129409