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A level and a compass: your phone has both, so naturally I built my own. One case printed on a Creality Ender-3 V3 KE, four brass inserts, three boards (a TTGO T-Display with an ESP32, an MPU-6500 accelerometer and gyro, a BMM150 magnetometer) and one 18650 cell charged over USB-C. Within half a degree of level it turns green and beeps once. The lesson: a magnetometer notices everything, from the buzzer’s magnet to the charging cable and a phone nearby. So: buy one, or build one?
An ESP32 board with a 1.14-inch colour screen already wired to it. What is connected where, which GPIOs are safe to use, how long it lasts on a battery — and where the classic T-Display ends and the S3 begins.
