Design and construction of a heat sensor

Abstract

. Simple heat sensor circuit designed to give alert sound when the temperature rises due to any heat, here we can adjust the temperature threshold level using Variable resistor RV1. This simple circuit is easy to construct and test. This circuit utilize NTC (Negative Temperature Coefficient) thermistor since the Resistance value of this device decrease when the temperature rises. The thermistor is of low cost compared to other heat sensing devices, it is constructed of a semiconducting material rendering it the most sensitive