Digital Medical Weight Scale Design

Microchip’s innovative connected Bluetooth® medical weight scale reference design

Microchip Technology offers smart connected weight scale reference designs for medical applications. 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 caregivers. 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 provides a complete family of eXtreme Low Power (XLP) technology PIC microcontrollers with sleep currents as low as 9 nA and the flexibility of integrated 8-bit, 10-bit, and 12-bit ADCs. Experience lower development costs with Microchip’s MPLAB® code configurator. This is a free graphical programming environment that generates seamless, easy to understand C code that is inserted into a user’s project. Using an intuitive interface, it enables and configures a rich set of peripherals and functions. It is integrated into MPLAB X IDE to provide a powerful and easy to use development platform. Lower BOM costs and less design complexity are enabled by the integration of coherent peripherals, like built-in LCD drive, touch-sensing capability, and other associated features, in most of the popular MCU families. 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 XLP, cost-effective 8-bit microcontroller with an integrated capacitive touch sensing module, 12-bit ADC, operational amplifiers, and Bluetooth connectivity solutions making it ideal for weight scale medical applications.

Design Files

• Schematics
• Example Source Code

Connected Weight Scale Reference Design 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

Operational Amplifiers

DC/DC Switching Regulator

Linear Voltage Regulator