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Teach, Learn and Make with Raspberry Pi Ben Nuttall Raspberry Pi Foundation UK Charity 1129409

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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)

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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

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Raspberry Pi ● Sonic Pi ● Python ● Physical computing ● Minecraft: Pi Edition ● Picamera ● Astro Pi

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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

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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

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Physical computing ● Flashy lights ● Motors & robots ● Photo & video ● Sensors ● Internet of Things ● Engaging and empowering

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3V3 = always on

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GPIO = user controllable

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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)

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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)

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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)

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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)

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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()

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Traffic Lights green.on() yellow.off() red.off() sleep(10)

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Traffic Lights green.off() yellow.on() sleep(1)

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Traffic Lights yellow.off() red.on() sleep(10)

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Traffic Lights yellow.on() sleep(1)

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Traffic Lights green.on() yellow.off() red.off()

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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

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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)

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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)

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Picamera ● Official Raspberry Pi camera module ● Command line interface for basic use ● Python programming interface for projects ● Still pictures, video, time- lapse

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Camera preview ● Open Terminal window ● raspistill -k

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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()

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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

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Astro Pi

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Sense HAT ● 8x8 RGB LED matrix ● Mini joystick ● Gyroscope ● Accelerometer ● Magnetometer ● Temperature sensor ● Barometric pressure sensor ● Humidity sensor

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Sense HAT - Python from sense_hat import SenseHat sense = SenseHat() sense.show_message('Hello world!')

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More examples https://github.com/RPi­Distro/python­sense­ hat/tree/master/examples https://github.com/bennuttall/sense­hat­examples

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Resources https://www.raspberrypi.org/resources/

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Teach, Learn and Make with Raspberry Pi Ben Nuttall Raspberry Pi Foundation UK Charity 1129409