Nunn, J (2016) DIY soundcard based temperature logging system. Part I: design. Phys. Educ., 51 (6). 065002

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Abstract

This paper aims to enable schools to make their own low-cost temperature logging instrument and to learn a something about its calibration in the process. This paper describes how a thermistor can be integrated into a simple potential divider circuit which is powered with the sound output of a computer and monitored by the microphone input. The voltage across a fixed resistor is recorded and scaled to convert it into a temperature reading in the range 0–100 °C. The calibration process is described with reference to fixed points and the effects of non-linearity are highlighted. An optimised calibration procedure is described which enables sub degree resolution and a software program was written which makes it possible to log, display and save temperature changes over a user determined period of time.

Item Type:	Article
Keywords:	Thermistor, Datalogger, Temperature, Soundcard, Calibration
Subjects:	Advanced Materials Advanced Materials > Microstructural Characterisation
Identification number/DOI:	10.1088/0031-9120/51/6/065002
Last Modified:	02 Feb 2018 13:13
URI:	http://eprintspublications.npl.co.uk/id/eprint/7256

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