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
   

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2. Sense HAT
   

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3. Open Python 3
   

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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
   

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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
   

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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
   

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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
   

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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
   

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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
   

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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
    ]
    

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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
    ]
    

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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
    

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13. Joystick
    def foo(ev):
    if ev.action == 'pressed':
    sense.show_message(str(sense.temperature))
    sense.stick.direction_up = foo
    

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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?
    

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