Physical computing with Python and Raspberry Pi Ben Nuttall - - PowerPoint PPT Presentation

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physical computing with python and raspberry pi ben
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Physical computing with Python and Raspberry Pi Ben Nuttall - - PowerPoint PPT Presentation

May 26, 2023 274 likes •722 views

Physical computing with Python and Raspberry Pi Ben Nuttall Raspberry Pi Foundation Ben Nuttall Education Developer Advocate at Raspberry Pi Foundation Software & project development Learning resources & teacher training

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Physical computing with Python and Raspberry Pi Ben Nuttall Raspberry Pi Foundation

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Ben Nuttall

  • Education Developer Advocate at Raspberry Pi Foundation

– Software & project development – Learning resources & teacher training – Outreach

  • Based in Cambridge, UK
  • @ben_nuttall on Twitter
  • Speaker at EuroPython, PyConUK, PySS, PyCon Ireland & EuroSciPy

in 2014

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Raspberry Pi 2

  • 900MHz quad core ARM7
  • 1GB RAM
  • Backwards-compatible with Pi 1
  • Same form factor as B+
  • Still $35 (B+ now $25, A+ $20)
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All about Education

  • 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 Croston – beer brewing

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Dave Jones - microscopy

picamera.readthedocs.org

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Raspbian

  • Foundation-issued Debian-based distribution

– Currently based on Wheezy – Jessie image coming soon

  • Image supports Pi 1 and Pi 2
  • Software pre-installed

– Python 3 (also Python 2), Ruby, Java, Mathematica, etc. – GPIO, Picamera, (soon pip too)

  • Alternative distributions are available, but not supported, e.g:

– Ubuntu MATE (Pi 2) – Ubuntu Snappy Core (Pi 2) – Arch Linux

www.raspberrypi.org/downloads

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GPIO Pins – General Purpose Input/Output

rasp.io

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Analogue?

  • No native analogue on Raspberry Pi
  • Options:

– Analogue inputs can be read via ADC – Various Arduino-compatible add-on boards available – Use PySerial to read Arduino inputs over USB

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Python library - RPi.GPIO

  • Included in Raspbian
  • Implemented in C
  • Features:

– Confjgure pins as input/output – Read inputs (high/low) – Set outputs (high low) – Wait for edge (wait for input to go high/low) – Pin event detection (callback on input pin change)

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3V3 = always on

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GPIO = user controllable

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Flash LED with RPi.GPIO

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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Push button stop motion

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Push button stop motion

from picamera import PiCamera from RPi import GPIO from time import sleep button = 17 GPIO.setmode(GPIO.BCM) GPIO.setup(button, GPIO.IN, GPIO.PUD_UP)

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Push button stop motion

with PiCamera() as camera: camera.start_preview() frame = 1 while True: GPIO.wait_for_edge(button, GPIO.FALLING) camera.capture('/home/pi/animation/frame%03d.jpg' % frame) frame += 1 camera.stop_preview()

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GPIO Music Box

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GPIO Music Box – GPIO events

GPIO.add_event_detect( button, GPIO.FALLING, callback=play, bouncetime=1000 )

www.raspberrypi.org/learning/gpio-music-box/

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GPIO Music Box – GPIO events

sound_pins = { 2: drum, 3: cymbal, } def play(pin): sound = sound_pins[pin] sound.play()

www.raspberrypi.org/learning/gpio-music-box/

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CamJam EduKit

camjam.me/edukit

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The Gertboard

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Ryanteck RPi Motor Controller Board

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Pimoroni - Pibrella

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Pibrella – traffjc lights

import pibrella from time import sleep pibrella.light.green.on() sleep(1) pibrella.light.amber.on() sleep(1) pibrella.light.red.on()

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Pibrella – button press event

def flash(pin): pibrella.light.on() sleep(1) pibrella.light.off() pibrella.button.pressed(flash)

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Energenie – remote controlled power sockets

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Energenie – remote controlled power sockets

import energenie from time import sleep energenie.switch_on() sleep(5) energenie.switch_off() pythonhosted.org/energenie

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Energenie – web app

pythonhosted.org/energenie /examples/web/

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26->40 pin header

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Raspberry Pi HATs – Hardware Attached on Top

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Sous Vide cooking

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Chef HAT

WIP – github.com/bennuttall/chef-hat pypi.python.org/pypi/chef-hat

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Chef HAT – temperature moderation

if self.temperature < self.target_temperature: self.turn_cooker_on() else: self.turn_cooker_off()

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DOTS board

www.raspberrypi.org/dots

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DOTS board software

def get_selected_colors(): return [COLOR_PINS[pin] for pin in COLOR_PINS if pin_is_active(pin)] def enough_dots_connected(): active_pins = sum(pin_is_active(pin) for pin in DOT_PINS) return active_pins > MINIMUM_DOTS_REQUIRED def pin_is_active(pin): GPIO.setup(pin, GPIO.IN, GPIO.PUD_UP) state = GPIO.input(pin) GPIO.setup(pin, GPIO.IN, GPIO.PUD_OFF) return state == 0

pypi.python.org/pypi/rpi-dots

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Plantpot Greenhouse

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Capacitive Touch HAT

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Pimoroni - HATs

http://shop.pimoroni.com/collections/hats

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Weather Station kit

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Astro Pi

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Astro Pi / Sense HAT

  • 8x8 RGB LED matrix
  • Temperature
  • Humidity
  • Pressure
  • Accelerometer
  • Gyroscope
  • Magnetometer
  • Mini joystick

pypi.python.org/pypi/astro-pi

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Thank you - any questions?