https://learn.adafruit.com/adxl345-digital-accelerometer
https://learn.sparkfun.com/tutorials/adxl345-hookup-guide
https://www.analog.com/en/products/adxl345.html
https://www.sparkfun.com/products/9836
https://arduinoshoppen.dk/produkt/3-axis-accelerometer-adxl345-digital-acceleration-sensor-module/