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Using an Arduino UNO, a Waveshare 128x128 1.5" OLED and an Adafruit BN055 gyroscope we create a simple artificial horizon and directional indicator that works upright and inverted. Not for use in flight... for educational purposes only.
Bare-metal STM32L031K6 firmware: an MPU-6050 rendered on a 128×64 SSD1306 OLED as an aircraft-style artificial horizon. No HAL, no CubeMX — direct register access, two independent I²C buses (hardware + bit-banged), and a boot diagnostic ladder that pinpoints wiring faults.