Introduction

A simple CircuitPython resistive touchscreen calibrator for Adafruit built-in and TFT FeatherWing displays.

On-screen touchscreen calibrator for built-in and TFT FeatherWing displays. To use, run as a standalone module, include the following line in the calling module, or type into the REPL:

import touchcalibrator.built_in

for built-in displays or

import touchcalibrator.featherwing

for TFT FeatherWing displays.

Operational parameters such as screen rotation and REPL-only measurement display can be set in the operational parameters portion of the module.

When the test screen appears, use a stylus to swipe to the four edges of the visible display area. As the screen is calibrated, the small red square tracks the stylus tip (when REPL_ONLY=False). Minimum and maximum calibration values will display on the screen and in the REPL. The REPL values can be copied and pasted into the calling code's touchscreen instantiation statement.

Touchscreen Instantiation example code for built-in displays. The order of the calibration tuples is determined by the display rotation value:

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 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 cedargrove_touchcalibrator

Or the following command to update an existing version:

circup update

Documentation

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.