Wednesday, February 28, 2024

Thermometer Reference Design With Integrated MCU, Capacitive Touch Module And Bluetooth

By Akanksha Sondhi Gaur

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Discover how Microchip’s Connected Thermometer Board utilizes technology to create a Bluetooth-connected digital thermometer, offering efficient power management, capacitive touch interfaces, and global compatibility. 

Thermometers have been around for some time in traditional medical settings, but now digital temperature measurement devices can be found in many new and exciting places. For example, the ability to measure temperature is now being integrated into many consumer products such as connected fitness and medical activity trackers.

Microchip’s Connected Thermometer Board demonstrates the implementation of a Bluetooth-connected digital thermometer using Microchip’s PIC16F1519 MCU and RN42 Bluetooth Module. The MCU is an eXtreme Low Power (XLP), cost-effective 8-bit microcontroller with an integrated capacitive touch sensing module. Connectivity is demonstrated on this board using Microchip’s fully qualified RN42 Bluetooth2.1 + EDR Module. This demo design can also be easily implemented using any of Microchip’s Bluetooth Low Energy or Wi-Fi connectivity modules.

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The microcontroller features eXtreme Low Power (XLP) technology, ensuring efficient power management. It incorporates an mTouch integrated capacitive touch sensing module for responsive touch interfaces. Additionally, it boasts a 28-channel 10-bit Analog-to-Digital Converter (ADC), facilitating precise analog signal conversion. The microcontroller is equipped with a fixed voltage reference offering selectable voltage level outputs, enhancing its versatility. Furthermore, it is available in various packages, including a compact Ultra-Thin QFN (UQFN) option, catering to diverse application requirements.

The RN4871 Bluetooth Low Energy Module is a cutting-edge solution, boasting Bluetooth 5 certification for enhanced connectivity performance. It features a user-friendly ASCII command interface, simplifying communication with the host microcontroller. This module has been certified for use in a wide range of regions, including the USA, Canada, Brazil, Europe, Japan, Korea, Taiwan, and China, ensuring global compatibility. It supports a mobile application through Microchip Bluetooth Data (MBD), providing seamless integration into various systems. Furthermore, it offers remote configuration capabilities, streamlining setup processes. Users have the option to choose between a ceramic chip antenna or an external antenna connection, enhancing flexibility in designing wireless communication systems.

Microchip has conducted extensive testing on this reference design, encompassing design files, system files, and more. For additional information regarding this reference design, please visit the company’s website. 

To delve deeper into the specifics of this design, simply click here.

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