Pedometer Demonstration/Wearable Activity Tracker Development BoardPIC16LF171X MCU Family/RN4020 Bluetooth® Low Energy Module

SummaryWearable 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 offl oad

the MCU core) such as:• Confi gurable 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 amplifi ers ■ High-speed comparators ■ Internal voltage reference module

RN4020 BTLE Module Features ■ Fully qualifi ed 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 ■ Certifi cations: FCC, IC, CE, QDID ■ Small form factor ■ Low-power modes ■ GAP, GATT, SM, L2CAP and Bluetooth SIG profi les

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 fi rmware library

developed by Bosch Sensortec ■ Additional biometric measurement capability can be

added using other Microchip reference designs*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

Information subject to change. The Microchip name and logo and the Microchip logo are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. All other trademarks mentioned herein are property of their respective companies. © 2015, Microchip Technology Incorporated. All Rights Reserved. Printed in the U.S.A. 5/15 DS00001892A

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www.microchip.com/medical

Development Made EasyStart 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, go to www.microchip.com/medical, and click on the Wearable Activity Monitors link.

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

System Diagram

PIC16LF1718

AccelerometerBosch BMA250E

Three Digits 7-segment LED

Display

Push Button

VDD

RN4020 Bluetooth® 4.1 Low Energy

Module

I2C™

IOC

UART

I/Os

CR2032LithiumBattery