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Connected Weight Scale Demonstration Board

PIC16F178X MCU Family with Intelligent Analog and the RN42 Bluetooth® Module

Connected Weight Scale Demo


Weight scales have been used for quite a while in homes, businesses and medical facilities. With the increase in demand for health-related information, connected weight scales can now send data to smartphones, tablets and the Cloud where it can be utilized by medical providers and other care givers. Connected weight scales are being used with other home-based consumer and medical devices to improve the health and general well-being of many people.

Microchip’s Connected Weight Scale Demonstration Board shows the implementation of a Bluetooth®-connected weight scale using Microchip’s PIC16F1783 MCU and the RN42 Bluetooth module. The PIC16F1783 MCU is an eXtreme Low Power (XLP), cost-effective 8-bit microcontroller with an integrated capacitive touch sensing module, 12-bit ADC and operational amplifiers.

Connectivity is demonstrated on this board by the use of Microchip’s fully qualified RN42 Bluetooth 2.1 + EDR module. This demo design can also be easily implemented using any of Microchip’s Bluetooth Low Energy or Wi-Fi® connectivity modules.

PIC16F1783 MCU Features

  • eXtreme Low Power (XLP) technology
  • mTouch® integrated capacitive touch sensing module
  • 11-channel 12-bit ADC
  • Integrated operational amplifiers
  • Several packages available including a small Ultra-Thin QFN (UQFN) package

RN42 Bluetooth Module Features

  • Fully certified Bluetooth 2.1 + EDR module offers rapid time to market for connected designs
  • On-board embedded Bluetooth stack (no host processor required)
  • Supports Bluetooth data link to iPhone/iPad/iPod Touch
  • UART local and over-the-air RF configuration
  • Secure communications, 128 bit encryption
  • Small form factor
  • Programmable low-power modes
  • Bluetooth SIG qualified

This reference design helps to develop low-cost, connected digital weight scale functionality.*

Connected Weight Scale Demonstration Board Highlights

  • Displays instructions to user and measures weight in pounds and kilograms
  • Bluetooth module is used to demonstrate smartphone/tablet connected design capability
  • Low overall BOM cost due to function integration
  • Low-power operation utilizing Microchip’s eXtreme Low Power PIC16F1783 MCU
  • Powered by two AAA batteries

System Diagram

PIC16F783 Block Diagram

Development Made Easy

Start with the free download of the schematics and 'C' source code that can easily be modified to your specific application needs.

*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.

Connected Weight Scale Channel