Retired instrumentation engineer Don Welch built a DIY heading indicator using a Teensy 4.0 microcontroller and a BNO085 IMU. To make it immune to magnetic disturbances, the magnetometer data is ignored entirely, relying only on the gyroscope and accelerometer. The device displays a compass rose on a small round TFT screen, updates at 200 Hz for smooth motion tracking, and can be manually calibrated via an encoder or by pointing north at startup. It is not aircraft-certified but serves as an interesting hobbyist recreation of aviation instrumentation.
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