In this work, we describe the project and operation of a simple direct reading temperature electronic system which uses a thermistor as sensing element. The system is composed of a stabilized power supply, a resistor-thermistor series circuit, and a signal conditioning circuit based only on one integrated circuit, and it may be operated using a battery. The system provides accuracy of about 0.1 ºC for a range of temperature varying between 0 ºC to 32 ºC, being indicated for experiments which involve measurements of small temperature changes. The system also provides some additional features, such as robustness, ease to building, low cost, and rapid response to temperature changes.
thermometer; thermistor; temperature measurement
