The Art of Directly Interfacing Sensors to Microcontrollers

Journal of Low Power Electronics and Applications

关键词: capacitive sensor;    microcontroller;    power consumption;    resistive sensor;    sensor electronic interface;   

DOI  :  10.3390/jlpea2040265

来源: mdpi

【 摘 要 】

This paper reviews the direct connection of sensors to microcontrollers without using any analogue circuit (such as an amplifier or analogue-to-digital converter) in the signal path, thus resulting in a low-cost, lower-power sensor electronic interface. It first discusses the operating principle and explains how resistive and capacitive sensors with different topologies (i.e., single, differential and bridge type) can be directly connected to a microcontroller to build the so-called direct interface circuit. It then shows some applications of the proposed circuits using commercial devices and discusses their performance. Finally, it deals with the power consumption and proposes some design guidelines to reduce the current consumption of such circuits in active mode.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.