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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

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

  2. 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