Sense HAT workshop

Sense HAT workshop given at Pi Towers Raspberry Jam, October 2016

Transcript

1. Sense HAT workshop • Special made for Tim Peake's Astro Pi mission • Sensors, LED display & joystick • Great for science, games and creativity • Works on any Pi model • Emulators also available
2. Sense HAT
3. Open Python 3
4. Type directly into the Python shell >>> from sense_hat import SenseHat >>> sense = SenseHat() >>> sense.show_message(“Hello world”) >>> sense.temperature >>> sense.humidity >>> sense.accelerometer >>> sense.gyroscope >>> sense.orientation
5. Open a new window and type... from sense_hat import SenseHat sense = SenseHat() x = 4 y = 5 r = 19 g = 180 b = 230 sense.set_pixel(x, y, r, g, b) Save and run: Ctrl + S F5
6. Run! Change the numbers! Run again! from sense_hat import SenseHat sense = SenseHat() x = 2 y = 3 r = 222 g = 33 b = 111 sense.set_pixel(x, y, r, g, b) Save and run: Ctrl + S F5
7. Let the computer pick random numbers... from sense_hat import SenseHat from random import randint sense = SenseHat() x = randint(0, 7) y = randint(0, 7) r = randint(0, 255) g = randint(0, 255) b = randint(0, 255) sense.set_pixel(x, y, r, g, b) Save and run: Ctrl + S F5
8. Random sparkles! from sense_hat import SenseHat from random import randint from time import sleep sense = SenseHat() while True: x = randint(0, 7) y = randint(0, 7) r = randint(0, 255) g = randint(0, 255) b = randint(0, 255) sense.set_pixel(x, y, r, g, b) sleep(0.01) Save and run: Ctrl + S F5
9. Pixel pet from sense_hat import SenseHat from time import sleep sense = SenseHat() p = (204, 0, 204) # Pink g = (0, 102, 102) # Dark Green w = (200, 200, 200) # White y = (204, 204, 0) # Yellow e = (0, 0, 0) # Empty
10. Pixel pet! pet1 = [ e, e, e, e, e, e, e, e, p, e, e, e, e, e, e, e, e, p, e, e, p, e, p, e, e, p, g, g, p, y, y, e, e, g, g, g, y, w, y, g, e, g, g, g, g, y, y, e, e, g, e, g, e, g, e, e, e, e, e, e, e, e, e, e ]
11. Pixel pet! pet2 = [ e, e, e, e, e, e, e, e, p, e, e, e, e, e, e, e, e, p, e, e, p, e, p, e, e, p, g, g, p, w, w, e, e, g, g, g, w, y, w, y, e, g, g, g, g, w, w, e, e, e, g, e, g, e, e, e, e, e, e, e, e, e, e, e ]
12. ...and breathe... while True: print(sense.humidity) if sense.humidity < 60: sense.set_pixels(pet1) sleep(0.5) else: sense.set_pixels(pet2) sleep(2) Save and run: Ctrl + S F5
13. Joystick def foo(ev): if ev.action == 'pressed': sense.show_message(str(sense.temperature)) sense.stick.direction_up = foo
14. What else can you do? • You've learned how to: – Read sensor values – Write text to the screen – Write pixels and pixel art to the screen – Use the sensors to display different pictures when shaken • What else can you do?