circuitpython-button-handler 3.0.3

This helper library simplifies the usage of buttons with CircuitPython, by detecting and differentiating button inputs, returning a set of the inputs and calling their corresponding functions.

Introduction

This helper library simplifies the usage of buttons with CircuitPython, by detecting and differentiating button inputs, returning a set of the inputs and calling their corresponding functions.

Dependencies

This driver depends on:

• Adafruit CircuitPython

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle or individual libraries can be installed using circup.

Installing from PyPI

On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI. To install for current user:

pip3 install circuitpython-button-handler

To install system-wide (this may be required in some cases):

sudo pip3 install circuitpython-button-handler

To install in a virtual environment in your current project:

mkdir project-name && cd project-name
python3 -m venv .venv
source .env/bin/activate
pip3 install circuitpython-button-handler

Installing to a Connected CircuitPython Device with Circup

Make sure that you have circup installed in your Python environment. Install it with the following command if necessary:

pip3 install circup

With circup installed and your CircuitPython device connected use the following command to install:

circup install button_handler

Or the following command to update an existing version:

circup update

Usage Example

This simple script showcases the usage of this library using a single button.

See the examples directory for more complex examples, including triple presses, configuring button press delays, and supporting multiple buttons.

Button wiring
GND
D9

# SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
# SPDX-FileCopyrightText: Copyright (c) 2024 EGJ Moorington
#
# SPDX-License-Identifier: Unlicense

"""
This example demonstrates simple usage of the library for a single button set-up.
"""

import time

import board
from keypad import Keys

from button_handler import ButtonHandler, ButtonInput


def double_press():
    print("Double press detected!")


def short_press():
    print("Short press detected!")


def long_press():
    print("Long press detected!")


def hold():
    print("The button began being held down!")


actions = {
    ButtonInput(ButtonInput.DOUBLE_PRESS, callback=double_press),
    ButtonInput(ButtonInput.SHORT_PRESS, callback=short_press),
    ButtonInput(ButtonInput.LONG_PRESS, callback=long_press),
    ButtonInput(ButtonInput.HOLD, callback=hold),
}

scanner = Keys([board.D9], value_when_pressed=False)
button_handler = ButtonHandler(scanner.events, actions)


while True:
    button_handler.update()
    time.sleep(0.0025)

Documentation

API documentation for this library can be found on Read the Docs.

For information on building library documentation, please check out this guide.

Contributing

Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.

The easiest way to contribute to the repository is by creating an issue. Add a concise title and then explain the issue or suggestion in more detail in the description. This is helpful even if you do not intend to develop a fix. If you wish to do so, however, the repository must first be forked.

Forking the repository

In order to add commits to this repository, it must be forked first. This creates a copy of the repository you can edit. Make sure to deselect “Copy the main branch only”.

The following steps explain the recommended approach to working on a fork. Git needs to be installed for this.

1. Clone the repository.

   Open a terminal in the directory where you wish to clone the fork, and then run the following:

   git clone https://github.com/<your-github-username>/CircuitPython_Button_Handler.git

   Keep in mind the URL will be different if you changed the fork’s name.

2. Set pre-commit up.

   This repository is set up with tools that assist in development by automatically formatting code, enforcing code standards and fixing issues where possible.

   For these tools to run automatically before committing, pre-commit has to be installed. This can be done in a virtual environment in order to maintain a cleaner development setup. Using a virtual environment isolates dependencies, ensuring they don’t conflict with other projects.

   To install pre-commit in a Python virtual environment:

   1. Ensure Python is installed in your system.

      You can check your version of Python with the following command:

      python --version

   2. Create a Python virtual environment.

      To make a virtual environment of name .venv in the current directory, run:

      python -m venv .venv

   3. Activate the virtual environment.

      • On Windows, run:

        .\.venv\Scripts\activate

      • On Linux or macOS, run:

        source .venv/bin/activate

      To avoid repeating this step every time a terminal is opened in this directory, configure your IDE to use the .venv virtual environment as the default interpreter. In Visual Studio Code, this can be done by opening the command palette, typing Python: Select Interpreter and selecting the .venv virtual environment.

   4. Install pre-commit.

      This can easily be achieved by executing:

      pip install pre-commit
      pre-commit install

      After installing pre-commit, the necessary hooks are installed on the next git commit or the next time pre-commit run is executed.

3. Create a new branch.

   To make a new branch from the dev branch:

   git checkout dev
   git branch -b <branch-name>

   For consistency, please name the branch the same as the issue it addresses with the number of the issue preceding the name. Write the name in kebab-case and with no special characters (underscores are allowed).

   For example, the branch for issue #26 “Update .readthedocs.yaml with Sphinx key” was “26-update-readthedocsyaml-with-sphinx-key”.

4. Commit your changes.

   After adding your changes, commit them to the new branch by executing:

   git add .
   git commit

   When ready, push the changes to GitHub with the following commands:

   git remote add origin https://github.com/<your-github-username>/CircuitPython_Button_Handler.git
   git push --set-upstream origin <branch-name>

5. Open a pull request.

   Upon opening (or refreshing) the fork’s GitHub page, a message should be visible close to the top of the page:

   This branch is 1 commit ahead of EGJ-Moorington/CircuitPython_Button_Handler:main.

   Firstly, ensure the branch is up to date by pressing “Sync fork”. Then, select “Contribute” > “Open pull request”.

   The page will show “Open a pull request”. Make sure to select base: dev and compare: <your-branch-name> in the dropdowns.

   Write a brief title and then explain the changes in the description. Finish by using a closing keyword for your issue.