Physical computing with Scratch and Python

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Physical Computing with Scratch and Python

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Boot the Pi and open Scratch

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GPIO Server ● GPIO Server On

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Broadcast ● configXout ● gpioXon ● gpioXoff ● wait X secs ● forever Component GPIO pin Red LED 25 Amber LED 8 Green LED 7 Buzzer 15

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Close Scratch and open Python 3

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Open a new file ● File > New File ● File > Save ● Save as camjam.py

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GPIO Zero LED from gpiozero import LED led = LED(25) while True: led.on() sleep(1) led.off() sleep(1) Save and run: Ctrl + S F5

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GPIO Zero LED from gpiozero import LED led = LED(25) led.blink()

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GPIO Zero Button + LED from gpiozero import Button, LED button = Button(21) led = LED(25) while True: button.wait_for_press() led.on() button.wait_for_release() led.off()

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GPIO Zero Button + LED from gpiozero import Button, LED button = Button(21) led = LED(25) while True: led.on() button.wait_for_press() led.off() button.wait_for_release()

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GPIO Zero Button + LED from gpiozero import Button, LED button = Button(21) led = LED(25) while True: led.blink() button.wait_for_press() led.off() button.wait_for_release()

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Traffic Lights from gpiozero import Button, TrafficLights button = Button(21) lights = TrafficLights(25, 8, 7) while True: button.wait_for_press() lights.on() button.wait_for_release() lights.off()

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Traffic Lights from gpiozero import Button, TrafficLights button = Button(21) lights = TrafficLights(25, 8, 7) while True: lights.blink() button.wait_for_press() lights.on() button.wait_for_release()

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Traffic Lights from gpiozero import Button, TrafficLights, Buzzer from time import sleep button = Button(21) lights = TrafficLights(25, 8, 7) buzzer = Buzzer(15) while True: lights.on() buzzer.off() button.wait_for_press() lights.off() buzzer.on() button.wait_for_release()

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Traffic Lights while True: lights.green.on() sleep(1) lights.amber.on() sleep(1) lights.red.on() sleep(1) lights.off()

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Traffic Lights while True: button.wait_for_press() lights.green.on() sleep(1) lights.amber.on() sleep(1) lights.red.on() sleep(1) lights.off()

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Traffic Lights Sequence ● Can you make a full traffic lights sequence? ● Use the button for a pedestrian crossing ● Use buzzer.beep() to indicate safe crossing

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Documentation and help guides ● raspberrypi.org/documentation/usage/scratch/gpio ● gpiozero.readthedocs.org ● raspberrypi.org/resources ● raspberrypi.org/education/downloads

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Physical Computing with Scratch and Python