Raspberry Pi Pico W as HTTP client: Use of Hardware Buttons and Rotary Encoder

Raspberry Pi Pico W CiruitPython code for using the Pico W as a HTTP client in the Photobooth Project. You can connect several Buttons or a Rotary Encoder to trigger different actions.

Requirements:

• Download and install CircuitPython as described here

Preparation

1. Download and run the automated downloader to get needed files and libraries for your device.

The downloader also asks for your WiFi credentials to create the settings.toml file for you, also the Remotebuzzer Server IP and Port must be entered if asked to update the code.py automatically for you.

wget -O download-files.sh https://raw.githubusercontent.com/PhotoboothProject/Pico_W_as_remote_button_and_rotary_encoder/main/download-files.sh
bash download-files.sh

After running the script, the directory will be structured like this:

Photobooth_Pi_Pico_Buzzer/
├── library_info.txt
├── lib/
│   ├── adafruit_hid/
│   │   ├── .mpy files from the HID library
│   ├── adafruit_connection_manager.mpy
│   ├── adafruit_debouncer.mpy
│   ├── adafruit_requests.mpy
│   └── adafruit_ticks.mpy
├── code.py
└── settings.toml

2. Copy the settings.toml, code.py and lib folder to the Pico´s CIRCUITPY folder.

3. Have fun!

Button actions & LED

Up to 5 buttons can be used which trigger up to 6 different web requests for:

• start-picture
• start-collage
• start-custom
• start-print
• start-video
• shutdown-now

as descirbed in the Photobooth documentation.

There is also LED support for arcarde push buttons, meaning if you use a combined LED button, triggering the button will also light up the LED.

Wiring layout

Button Number	GP Number	LED GP Number	Short Press Action	Long Press Action
1	GP10	GP11	Trigger Picture	Trigger Collage
2	GP12	GP13	Trigger Print	Trigger Print
3	GP14	GP15	Trigger Video Capture	Trigger Video Capture
4	GP16	GP17	Trigger Custom Capture	Trigger Custom Capture
5	GP18	GP19	Trigger Shutdown	Trigger Shutdown

Rotary encoder

A rotary encoder is implemented: It triggers web requests for cw (clockwise) and ccw (counter-clockwise). Pressing the encoder´s push button will trigger a web request for rotary-btn-press.

Wiring layout

GP Number	Encoder Connection	Description
GP2	BTN	Trigger Click (Short Press & Long Press)
GP3	CLK	CW Action
GP4	DT	CCW Action