A low cost digital voltmeter with temperature-measuring and data logging

This paper presents the development of a low-cost system capable of measuring data of both voltage and temperature. The data collected is stored in a SD card in tabular form which allows their processing in a typical computer software like Microsoft Excel or Matlab. A real-time clock module was used to include a time stand for the measurements. System was validated by comparing system proposed results with previous studies developed by authors. Results demonstrate a maximum error of 3%.