Python Picamera with GPIO Zero

Picamera workshop given at Pi Towers Raspberry Jam, October 2016

Transcript

1. Python Picamera
   with GPIO Zero
   Introducing the camera board
   and Python module
   

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2. Raspberry Pi camera module
   - 5Mpx / 8Mpx
   - Full HD
   - Photo & video
   - Command line
   - Python module
   - Infra-red camera
   

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3. Connect the camera
   

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4. Add a GPIO Button
   

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5. Boot the Pi and open Python 3
   

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6. IDLE Python Shell
   >>> from picamera import PiCamera
   >>> from gpiozero import Button
   >>> camera = PiCamera()
   >>> button = Button(17)
   >>> button.when_pressed = camera.start_preview
   >>> button.when_released = camera.stop_preview
   

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

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8. Take a selfie
   from picamera import PiCamera
   from time import sleep
   camera = PiCamera()
   camera.start_preview()
   sleep(3)
   camera.capture("/home/pi/image.jpg")
   camera.stop_preview()
   Save and run:
   Ctrl + S
   F5
   

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9. Add GPIO Button code
   from picamera import PiCamera
   from gpiozero import Button
   from time import sleep
   camera = PiCamera()
   button = Button(17)
   camera.start_preview()
   button.wait_for_press()
   sleep(3)
   camera.capture("/home/pi/button.jpg")
   camera.stop_preview()
   

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10. Add a loop
    camera.start_preview()
    for i in range(5):
    button.wait_for_press()
    sleep(3)
    camera.capture("/home/pi/button%s.jpg" % i)
    camera.stop_preview()
    

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11. Picamera effects
    

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12. Picamera effects
    camera.start_preview()
    button.wait_for_press()
    camera.image_effect = 'negative'
    sleep(5)
    camera.capture("/home/pi/negative.jpg")
    camera.stop_preview() Try more effects:
    - negative
    - colorswap
    - sketch
    - emboss
    

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13. Picamera effects
    import random
    camera.start_preview()
    for i in range(5):
    button.wait_for_press()
    effect = random.choice(list(camera.IMAGE_EFFECTS))
    camera.image_effect = effect
    camera.annotate_text = effect
    sleep(5)
    camera.capture("/home/pi/%s.jpg" % effect)
    camera.stop_preview()
    Try more effects:
    - negative
    - colorswap
    - sketch
    - emboss
    

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14. Documentation and help guides
    ●
    picamera.readthedocs.io
    ●
    gpiozero.readthedocs.io
    ●
    raspberrypi.org/resources
    ●
    raspberrypi.org/education/downloads
    

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15. What next?
    ●
    Time-lapse
    ●
    Stop motion animation
    ●
    Wildlife camera
    

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16. What next?
    ●
    Sensor trigger
    ●
    Send to social media
    ●
    Robotics
    

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