AN IMPLEMENTATION OF A COMPACT SMART RESISTIVE SENSOR BASED ON A MICROCONTROLLER WITH AN INTERNAL ADC

作者：Czaja Zbigniew^*

来源：Metrology and Measurement Systems, 2016, 23(2): 225-238.

DOI：10.1515/mms-2016-0020

• microcontrollers
• resistance measurement
• ADC
• time-domain measurements

In the paper a new implementation of a compact smart resistive sensor based on a microcontroller with internal ADCs is proposed and analysed. The solution is based only on a (already existing in the system) microcontroller and a simple sensor interface circuit working as a voltage divider consisting of a reference resistor and a resistive sensor connected in parallel with an interference suppression capacitor. The measurement method is based on stimulation of the sensor interface circuit by a single square voltage pulse and on sampling the resulting voltage on the resistive sensor. The proposed solution is illustrated by a complete application of the compact smart resistive sensor used for temperature measurements, based on an 8-bit ATxmega32A4 microcontroller with a 12-bit ADC and a Pt100 resistive sensor. The results of experimental research confirm that the compact smart resistive sensor has 1 degrees C resolution of temperature measurement for the whole range of changes of measured temperatures.

• 出版日期2016-6