i2c Extender data sheet: https://www.nxp.com/docs/en/data-sheet/PCA9615.pdf

Adafruit's accelerometer mma8451: https://learn.adafruit.com/adafruit-mma8451-accelerometer-breakout?view=all

oshpark PCB order: https://oshpark.com/shared_projects/XQiq4dmR