8-EPROM based temperature detection using R.T.D. as sensor

Abstract

Climate is an active factor in the physical environment of all living things. It influences on human welfare ranges from the immediate effects of weather events to complex responses associated with climatic changes. Several observable elements aid the description of weather and climate. These elements are, intensity and duration of solar radiation, temperature, humidity, evaporation, cloudiness and fog, pre- cipitation, visibility, barometric pressure and winds etc. Among all those elements temperature is an important phenomenon for clima- tological studies. In case of environmental hydrology, temperature plays a key role in various chemical and biological activities. To measure temperature various instruments are used for example thermometer, thermocouples, thermistors, thermograph R.T.D. etc. In the thermometer group mercury-in-glass or alcohol-in-glass thermom- eters are used. Thermocouple and thermistors indicate temperature electrically. Thermograph is used when permanent records are desired. In this paper an attempt has been made to describe EPROM (Erasable Programmable Read Only Memory) based temperature detection using R. T.D. (Resistance Temperature Detector) as sensor. R.T.D. is selected for sensing temperature. The change of resistance of R.T.D. with temperature can be measured as the change in voltage in mV. For handling the signal, the digital form has been used because any kind of interfacing with a microprocessor or computer is only possible with the digital signal. The use of microprocessor reduces the hardware considerably and we can also store the information in any desired form. The response time of the system also gets reduced by the use of microprocessors.