Python Picamera featuring GPIO Zero Introducing the camera board and Python module 

Who's this guy? Ben Nuttall Education Developer Advocate Raspberry Pi Foundation @ben_nuttall [email protected] github.com/bennuttall 

USA Tour 2014 

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

What you will learn ● How to connect the camera module ● How to use the Python picamera module to control the camera ● How to use the GPIO Zero Button interface to control the camera ● How to use loops to repeat commands ● How simple changes to code make different projects ● Ideas for camera projects 

Connect the camera 

Add a GPIO Button 

Boot the Pi and open Python 3 

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 

GPIO Zero Button button.is_pressed button.wait_for_press() button.wait_for_release() button.when_pressed = some_function button.when_released = some_function 

GPIO Zero Button while True: if button.is_pressed: print("Pressed") while True: if not button.is_pressed: print("Not pressed") 

GPIO Zero Button while True: button.wait_for_press() print("Pressed") button.wait_for_release() print("Released") 

GPIO Zero Button led = LED(4) button = Button(17) button.when_pressed = led.on button.when_released = led.off 

GPIO Zero Button def hello(): print("Pressed") button.when_pressed = hello 

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

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

Add GPIO Button code from picamera import PiCamera from gpiozero import Button from time import sleep button = Button(17) with PiCamera() as camera: camera.start_preview() button.wait_for_press() sleep(3) camera.capture("/home/pi/image2.jpg") camera.stop_preview() Save and run: Ctrl + S F5 

Add a loop with PiCamera() as camera: camera.start_preview() for i in range(5): button.wait_for_press() sleep(3) camera.capture("/home/pi/image%s.jpg" % i) camera.stop_preview() Save and run: Ctrl + S F5 

What's the difference? for i in range(5): button.wait_for_press() sleep(3) camera.capture("/home/pi/image%s.jpg" % i) button.wait_for_press() for i in range(5): sleep(3) camera.capture("/home/pi/image%s.jpg" % i) 

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

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

Two Buttons? left = Button(4) right = Button(14) left.when_pressed = camera.start_preview left.when_released = camera.stop_preview right.when_pressed = camera.capture ← Why wouldn't this work? 

Custom capture function def capture(): camera.capture("/home/pi/image.jpg") right.when_pressed = capture 

Custom capture function i = 0 def capture(): global i camera.capture("/home/pi/image%s.jpg" % i) i += 1 right.when_pressed = capture Alternatively, use the datetime module 

GPIO Zero Motion Sensor sensor = MotionSensor(14) sensor.is_motion sensor.wait_for_motion() sensor.wait_for_no_motion() sensor.when_motion = some_function sensor.when_no_motion = some_function 

picamera camera.start_preview() camera.stop_preview() camera.capture(output) camera.start_recording(output) camera.stop_recording() camera.add_overlay(source) 

picamera camera.resolution = (1280, 720) camera.rotation = 180 camera.annotate_text = "Hello world" 

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

Python Picamera featuring GPIO Zero Introducing the camera board and Python module