BLE Pedometer for use with CNN step counting

Description

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.

Self-assembly, PCB fabricated by ALLPCB. 4-layer PCB, lead-free HASL finish. C program for PIC18LF2420 compiled with xc8. PICkit 3 used for programming and debugging.

Files

main.c

C source file for PIC18LF2420

C Source File - 19.86 kB - 09/27/2024 at 01:50

Download

stepcounter_schematic.pdf

PCB electrical schematic for final design

Adobe Portable Document Format - 261.54 kB - 09/18/2024 at 01:01

Preview

gerbers-83023.zip

PCB Gerber files for final design

Zip Archive - 100.42 kB - 09/18/2024 at 00:47

Download

Murtishi_ELE 547 Final Presentation Version 7.pptx

Presentation given on prototype system for a graduate school embedded systems course

presentation - 11.48 MB - 09/18/2024 at 00:44

Download

ELE 547 Final Project Report 12_9_2022 Final Draft Version 4.pdf

Technical paper written about the prototype system implemented with a Raspberry Pi for a graduate school embedded systems course

Adobe Portable Document Format - 19.72 MB - 09/18/2024 at 00:42

Preview

Components

1 × PIC18F2420-I/SP Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers

1 × MIC5504-3.3YM5-TR

1 × BK-18650-PC2 Electronic Components / Misc. Electronic Components

1 × MCP73811T-420I/OT Power Management ICs / Power Supply Support

1 × PPPC061LGBN-RC Electronic Components / Misc. Electronic Components

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BLE Pedometer for use with CNN step counting

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Description

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Files

main.c

stepcounter_schematic.pdf

gerbers-83023.zip

Murtishi_ELE 547 Final Presentation Version 7.pptx

ELE 547 Final Project Report 12_9_2022 Final Draft Version 4.pdf

Components

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