Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Programming paradigms for physical computing and IoT
Search
Ben Nuttall
April 24, 2018
Programming
0
130
Programming paradigms for physical computing and IoT
Talk given at London Raspberry Pint April 2018 meetup
Ben Nuttall
April 24, 2018
Tweet
Share
More Decks by Ben Nuttall
See All by Ben Nuttall
Numeronyms are obnoxious
bennuttall
0
81
Live Highlights in BBC iPlayer
bennuttall
0
24
Rapid prototyping in BBC News with Python and AWS
bennuttall
0
98
Rapid prototyping in BBC News with Python and AWS
bennuttall
0
55
Running a Python Package Index for Raspberry Pi
bennuttall
0
66
From Acorns to Raspberries
bennuttall
0
45
Innovation in the newsroom
bennuttall
0
57
Innovation in the newsroom - MOS Running Order Manager
bennuttall
0
110
How to market your open source project
bennuttall
0
170
Other Decks in Programming
See All in Programming
TiDB Serverless ~理想のServerless DBを考える~
soso_15315
1
160
AWSでゲームサーバーを運用! Amazon GameLiftのお話
iriikeita
0
200
APIのない大学ログインWebサービスをWKWebViewとJavaScriptでアプリ化した話
akidon0000
1
330
最近追加した型の紹介とその振り返り
aki19035vc
0
170
Microservices rules (July 2024) : what good looks like
cer
PRO
0
1.6k
Google's Recipe for Scaling (Web) Security – LocoMocoSec 2024
lweichselbaum
0
170
20240706_CDKConf
takuyay0ne
0
1.2k
Activities at Cairo Library
cairolibrary720
0
1.2k
Rustのweb開発を助ける 便利なツール紹介
yuki0418
1
190
Play Billing Library 7.0.0 変更点まとめ@potatotips#88
kako351
0
160
Harnessing Large Language Models for Training-free Video Anomaly Detection
tereka114
1
1.3k
CSC307 Lecture 12
javiergs
PRO
0
220
Featured
See All Featured
Web development in the modern age
philhawksworth
203
10k
The Illustrated Children's Guide to Kubernetes
chrisshort
39
47k
The Language of Interfaces
destraynor
151
23k
Build your cross-platform service in a week with App Engine
jlugia
227
17k
How to train your dragon (web standard)
notwaldorf
79
5.5k
A better future with KSS
kneath
231
17k
How to name files
jennybc
67
96k
We Have a Design System, Now What?
morganepeng
46
7k
For a Future-Friendly Web
brad_frost
173
9.2k
Fashionably flexible responsive web design (full day workshop)
malarkey
399
65k
Exploring the Power of Turbo Streams & Action Cable | RailsConf2023
kevinliebholz
12
3.8k
Designing for Performance
lara
604
67k
Transcript
Programming paradigms for physical computing and IoT Ben Nuttall Raspberry
Pi Foundation UK Charity 1129409
Ben Nuttall • Raspberry Pi Community Manager • Based in
Cambridge • Creator of gpiozero python library and piwheels project • Columnist on opensource.com • github.com/bennuttall • twitter.com/ben_nuttall •
[email protected]
GPIO Pins – General Purpose Input/Output
GPIO Zero: a friendly API for GPIO devices from gpiozero
import LED led = LED(17) led.on()
Multi-paradigm: procedural (polling) from gpiozero import LED, Button led =
LED(17) button = Button(4) while True: if button.is_pressed: led.on() else: led.off()
Multi-paradigm: procedural (blocking) from gpiozero import LED, Button led =
LED(17) button = Button(4) while True: button.wait_for_press() led.on() button.wait_for_release() led.off()
Multi-paradigm: event-driven from gpiozero import LED, Button led = LED(17)
button = Button(4) button.when_pressed = led.on button.when_released = led.off
Multi-paradigm: declarative from gpiozero import LED, Button led = LED(17)
button = Button(4) led.source = button.values
GPIO Zero supports...
GPIO Zero Device Hierarchy!
.value >>> led = PWMLED(17) >>> led.value 0.0 >>> led.on()
>>> led.value 1.0 >>> led.value = 0
.value >>> led = PWMLED(17) >>> pot = MCP3008() >>>
led.value 0.0 >>> pot.value 0.510145879738202 >>> led.value = pot.value
.value >>> while True: ... led.value = pot.value
Source / Values Output Device .value .values .source Input Device
.value .values
Source / Values Output Device .value .values .source Input Device
.value .values
Source / Values from gpiozero import LED, Button led =
LED(17) button = Button(2) led.source = button.values
Processing values Output Device .value .values .source Input Device .value
.values function
Source tools from gpiozero import Button, LED from gpiozero.tools import
negated led = LED(4) btn = Button(17) led.source = negated(btn.values)
Combining values Output Device .value .values .source Input Device .value
.values Source tool Input Device .value .values
Source tools from gpiozero import Button, LED from gpiozero.tools import
all_values button_a = Button(2) button_b = Button(3) led = LED(17) led.source = all_values(button_a.values, button_b.values)
Cross-platform • Raspbian (Raspberry Pi) • Raspberry Pi Desktop x86
(PC) • Linux (PC) • Windows (PC) • Mac OS (Mac)
Supporting multiple back-ends • RPi.GPIO • Implemented in C, current
default • RPIO • Implemented in C • pigpio • Python wrapper for C library, runs as daemon, remote pins • Native • Pure Python, limited functionality, experimental • MockPin & MockPWMPin • Pure Python, used in test suite
MockPin $ GPIOZERO_PIN_FACTORY=mock python3 >>> from gpiozero import LED >>>
led = LED(22) >>> led.blink() >>> led.value True >>> led.value False
MockPin >>> from gpiozero import LED, Button >>> led =
LED(22) >>> button = Button(23) >>> led.source = button.values >>> led.value False >>> button.pin.drive_low() >>> led.value True
pigpio - remote GPIO from Pi or PC
pigpio - remote GPIO from Pi or PC from gpiozero
import LED from gpiozero.pins.pigpio import PiGPIOFactory factory = PiGPIOFactory('192.168.0.2') led = LED(22, pin_factory=factory) led.blink()
pigpio - remote GPIO from Pi or PC $ PIGPIO_ADDR=192.168.0.2
python3 led.py from gpiozero import LED led = LED(22) led.blink()
Raspberry Pi Desktop x86
Raspberry Pi Desktop x86 – Remote GPIO
Raspberry Pi Desktop x86 – GPIO expander
Internal devices • TimeOfDay • PingServer • CPUTemperature • More
coming soon • Make your own!
Energenie tortoise lamp from gpiozero import Energenie, TimeOfDay from datetime
import time lamp = Energenie(1) daytime = TimeOfDay(time(9), time(18)) lamp.source = daytime.values
Is the internet working? from gpiozero import LED, PingServer from
gpiozero.tools import negated green = LED(17) red = LED(18) google = PingServer('google.com') green.source = google.values green.source_delay = 60 red.source = negated(green.values)
CPU Temperature from gpiozero import LEDBarGraph, CPUTemperature cpu = CPUTemperature(min_temp=50,
max_temp=90) leds = LEDBarGraph(2, 3, 4, 5, 6, 7, 8, pwm=True) leds.source = cpu.values
Custom internal devices from gpiozero import InternalDevice class FileReader(InternalDevice): @property
def value(self): with open('value.txt') as f: return int(f.read().strip())
Blue Dot
Multi-paradigm: procedural (polling) from gpiozero import LED from bluedot import
BlueDot led = LED(17) bd = BlueDot() while True: if bd.is_pressed: led.on() else: led.off()
Multi-paradigm: procedural (blocking) from gpiozero import LED from bluedot import
BlueDot led = LED(17) bd = BlueDot() while True: bd.wait_for_press() led.on() bd.wait_for_release() led.off()
Multi-paradigm: event-driven from gpiozero import LED from bluedot import BlueDot
led = LED(17) bd = BlueDot() bd.when_pressed = led.on bd.when_released = led.off
Multi-paradigm: declarative from gpiozero import LED from bluedot import BlueDot
led = LED(17) bd = BlueDot() led.source = bd.values
IoT devices? from somelib import GardenLight, LightSensor, MotionSensor from gpiozero.tools
import all_values, negated garden = GardenLight() light = LightSensor() motion = MotionSensor() garden.source = all_values(negated(light.values), motion.values)
guizero
GitHub
pinout command line tool
Read the docs!
The MagPi
Programming paradigms for physical computing and IoT Ben Nuttall Raspberry
Pi Foundation UK Charity 1129409