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Pedometer Demonstration/Wearable Activity Tracker Development Board

PIC16LF171X MCU Family/RN4020 Bluetooth® Low Energy Module

Pedometer lg


Wearable activity trackers featuring step counting and Bluetooth Low Energy (BTLE) have become popular as everyday exercise measurement and motivation tools for people wanting to increase their physical activity and improve their health. Microchip's Pedometer Demonstration Board is a basic wearable activity tracker that counts each step a person takes by detecting the motion of the person's body using an accelerometer. It can be worn on the wrist like a bracelet or a watch. Microchip's Pedometer Demonstration board can also be used as a development platform for the design of more advanced activity tracker functions. The on-board RN4020 BTLE module allows the pedometer to communicate with a smartphone or tablet where the user's exercise progress can be tracked. The Pedometer Demonstration Board is powered by a single 3V Lithium coin cell battery.

Microchip's Pedometer Demonstration Board demonstrates the implementation of a Bluetooth Low Energy digital pedometer using Microchip's PIC16LF1718–a cost–effective 8-bit microcontroller with eXtreme Low Power (XLP) technology, Microchip's RN4020 Bluetooth 4.1 Low Energy Module and Bosch Sensortec's BMA250E Digital Triaxial Accelerometer.

PIC16LF1718 MCU Features

eXtreme Low Power (XLP) technology

Capacitive touch channels

Several packages including a small Ultra-Thin QFN (UQFN) package

Core independent peripherals (peripherals that offload the MCU core) such as:

Configurable Logic Cells

Complementary Output Generator (COG)

Numerically Controlled Oscillator (NCO)

Zero-Cross Detector (ZCD)

10-bit Analog-to-Digital Converter (ADC)

8-bit Digital-to-Analog Converter (DAC)

Operational amplifiers

High-speed comparators

Internal voltage reference module

RN4020 BTLE Module Features

Fully qualified Bluetooth 4.1 module offers rapid time to market for connected designs

On-board Bluetooth Low Energy 4.1 stack

Simple ASCII command interface over UART

Certifications: FCC, IC, CE, QDID

Small form factor

Low-power modes

GAP, GATT, SM, L2CAP and Bluetooth SIG profiles

This reference demo helps designers develop a low-cost, low-power, wearable pedometer with both an on-board LED display as well as Bluetooth Low Energy capability to connect to smartphones and tablets.*

Demonstration Highlights

Wearable measurement of user step count

Platform for development of more advanced activity tracker functions

LED display is used to demonstrate stand-alone wearable design capability

BTLE module is used to demonstrate smartphone/tablet connected wearable design capability

Low overall BOM cost due to high level of integration

Low-power operation

Uses an eXtreme Low Power PIC16LF1718 MCU

No user motion causes the MCU to go into Sleep mode, wakes up with motion

No user motion causes the Bosch accelerometer to go into low power mode, wakes up with motion

Powered from a single 3V Lithium coin cell battery

Accelerometer uses a step detection firmware library developed by Bosch Sensortec

Additional biometric measurement capability can be added using other Microchip reference designs



Pedometer Application Note

Pedometer Schematics

Pedometer 'C' Source Code

Related Pages

PIC16LF1718 Product Page

RN4020 BTLE Module Product Page

Medical Design Center

Contact your local sales representative to see a working demonstration of Microchip's Pedometer/Wearable Activity Monitor Development Board.

System Diagram

pedometer blk dgrm lg

Development Made Easy

Start with the free download of the application note, schematics and 'C' source code that can easily be modified to your specific application needs. To download, see the Resources section.

*Microchip medical reference designs and demos are intended for evaluation and development purposes only. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use.

Wearable Bluetooth Video Channel