GPIO Zero - Speaker Deck

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GPIO Zero Ben Nuttall Raspberry Pi Foundation UK Charity 1129409

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Ben Nuttall ● Raspberry Pi Community Manager ● Based in Cambridge ● Creator of gpiozero python library ● Columnist on opensource.com ● github.com/bennuttall ● twitter.com/ben_nuttall ● [email protected]

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GPIO Pins – General Purpose Input/Output

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GPIO Zero: a friendly API for GPIO devices from gpiozero import LED led = LED(17) led.on()

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Multi-paradigm: procedural from gpiozero import LED, Button led = LED(17) button = Button(4) while True: if button.is_pressed: led.on() else: led.off()

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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

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Multi-paradigm: declarative from gpiozero import LED, Button led = LED(17) button = Button(4) led.source = button.values

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GPIO Zero supports...

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GPIO Zero Device Hierarchy!

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.value >>> led = PWMLED(17) >>> led.value 0.0 >>> led.on() >>> led.value 1.0 >>> led.value = 0

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.value >>> led = PWMLED(17) >>> pot = MCP3008() >>> led.value = pot.value

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.value >>> led = PWMLED(17) >>> pot = MCP3008() >>> led.value = pot.value >>> while True: ... led.value = pot.value

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Source / Values Output Device .value .values .source Input Device .value .values

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Source / Values Output Device .value .values .source Input Device .value .values

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Source/Values from gpiozero import LED, Button led = LED(17) button = Button(2) led.source = button.values

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Processing values Output Device .value .values .source Input Device .value .values function

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Source tools from gpiozero import Button, LED from gpiozero.tools import negated led = LED(4) btn = Button(17) led.source = negated(btn.values)

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Combining values Output Device .value .values .source Input Device .value .values Source tool Input Device .value .values

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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)

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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

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MockPin $ GPIOZERO_PIN_FACTORY=MockPin python3 >>> from gpiozero import LED >>> led = LED(22) >>> led.blink() >>> led.value True >>> led.value False

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MockPin >>> from gpiozero import LED >>> from gpiozero.pins.mock import MockPin >>> led = LED(22) >>> button = Button(23) >>> led.source = button.values >>> pin = MockPin(23) >>> led.value False >>> pin.drive_low() >>> led.value True

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pigpio - remote GPIO from Pi or PC

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pigpio - remote GPIO from Pi or PC from gpiozero import LED from gpiozero.pins.pigpiod import PiGPIOPin led = LED(PiGPIOPin(22, host='192.168.0.2')) led.blink()

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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()

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Internal devices ● TimeOfDay ● PingServer ● CPUTemperature ● More coming soon ● Make your own!

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Energenie tortoise lamp from gpiozero import Energenie, TimeOfDay from datetime import time lamp = Energenie(1) daytime = TimeOfDay(time(8), time(20)) lamp.source = daytime.values

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Is the internet working? from gpiozero import LED, PingServer from gpiozero.tools import negated green = LED(17) red = LED(18) google = PingServer('google.com') google.source_delay = 60 green.source = google.values red.source = negated(green.values)

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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

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guizero

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PIXEL x86

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PIXEL x86 – Remote GPIO

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GitHub

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What's coming?

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What's coming? ● More GPIO devices, more internal devices ● More protocols (I2C, one wire, etc.) ● Improved documentation ● Improved Remote GPIO support including Pi Zero OTG ● Improved advanced features ● GUI representation for real and mock pins ● pinout command line tool

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pinout command line tool

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Read the docs!

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Contributors ● Core team: – Ben Nuttall – Dave Jones – Andrew Scheller ● Contributors: – Martin O'Hanlon – Steve Amor – David Glaude – Edward Betts – Alex Chan – Thijs Triemstra – Schelto vanDoorn – Alex Eames – Barry Byford – Clare Macrae – Tim Golden – Phil Howard