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Image: reddit.com · I put a spinning informational globe on my ESP32 e-reader

Worked Proof shown

A spinning globe app for the Xteink X4 e-reader

A spinning Earth app for CrossInk firmware on the Xteink X4 that shows day and night and opens World Factbook entries, built with Claude.

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Credits

  • Reddit poster CommunityFan89 Source ↗

Earliest dated source: 13 Jul 2026

The full story

An informational globe for CrossInk, a fork of the CrossPoint custom firmware for the Xteink X4 e-reader. The planet turns under a fixed crosshair as you press the buttons, shading the night side in real time from the sun's position, naming the country under the crosshair and opening its CIA World Factbook entry. It also has country search, three zoom levels, a home button and toggles for borders and shading, with map data from Natural Earth.

The maker says the ideas and hardware testing were theirs, a lot of the code was Claude's, and everything was checked against real-world references before it went on the device.

How it was done

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Sources

From a short post by the maker, so the details are as they tell them.

  • Reddit: I put a spinning informational globe on my ESP32 e-readerForum threadreddit.com
    Reddit poster: CommunityFan89Posted 13 Jul 2026

    The maker's post on r/esp32.

    If it disappears: archived copy of Reddit: I put a spinning informational globe on my ESP32 e-reader (opens in a new tab)

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