This is a wearable device that is the user-wearable component of a smart step counting system I developed. I designed this wearable device for a graduate school project as a rough proof-of-concept pedometer that replaces the Raspberry Pi in an earlier prototype with a purpose-built battery-powered, PIC18LF2420-based circuit designed to capture step data and send it over a wireless interface. The board is equipped with both a Pi Sense Hat that the PIC interfaces with through I2C and an HM-10 Bluetooth Low Energy module for communication with a host PC running a Keras model to perform motion classification and step counting. The board has some other cool features, like an on-board 18650 battery charge circuit and a low-power battery voltage read circuit. Aside from its intended purpose, this board can be used as a fun bare-metal interface to the Pi Sense Hat for access to other cool sensors.

I acknowledge lots of improvements can be made to this PCB but it's fun to look at.