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
2. Raspberry Pi camera module - 5Mpx / 8Mpx - Full HD - Photo & video - Command line - Python module - Infra-red camera
3. Connect the camera
4. Add a GPIO Button
5. Boot the Pi and open Python 3
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
7. Open a new file • File > New File • File > Save • Save as camera.py
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
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()
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()
11. Picamera effects
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
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
14. Documentation and help guides • picamera.readthedocs.io • gpiozero.readthedocs.io • raspberrypi.org/resources • raspberrypi.org/education/downloads
15. What next? • Time-lapse • Stop motion animation • Wildlife camera
16. What next? • Sensor trigger • Send to social media • Robotics