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Hi there Vivian.The ACAngle.h file is included in multiple libraries. I can recommend you to include the "Adafruit Unified Sensor" library in your project. And, if you are using the same hardware, then also add the "Adafruit LIS3DH".For the LEDs I'm using the NeoPixel RBGW so I included he "Adafruit NeoPixel".These libraries are dedicated for the hardware I used at the lamp. Depends on what hardware you are using, you may need different libraries and perhaps change a bit the code.Good luck.
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