After building two of the telegraphs, calibrate the analog servos by running the CircuitPython calibration code. Make note of each servo's minimum and maximum offset values. Then, update the code.py file with the values as noted on the Code the Two Way Telegraph page of this guide.

Power up the telegraphs and you're ready to start sending messages!

On one of the telegraphs, pull the servo's lever to an emoji while touching the copper tape capacitive touch point.

After releasing, the other telegraph will move its servo lever to point at the same emoji.

This can be a fun way to communicate quietly within the same household or long distance to let someone know you're thinking of them. You can also update the graphics to better suit your needs.

This guide was first published on Aug 10, 2022. It was last updated on Apr 17, 2024.

This page (Usage) was last updated on Mar 08, 2024.

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