The overall system was tested andfound perfectly functional. The general operation of the system and performance is dependent on the temperature difference between the preset temperature value and external temperature intended to be monitored. The results of the tests showed that the power output of the circuit is switched OFF hence switching OFF the heating device or an alarm is triggered ON when the device exceeded a preset temperature level. The system is powered using a 12V power supply. Pin 7 (discharge) is not connected to ground at that time, and thus it is not discharging the capacitor yet. Less than 1/3 supply voltage to pin 2 results in a high output and a charging capacitor through the resistance from the positive supply voltage (Vcc). ![]() Basically the system is constructed using temperature sensors and comparators. Pins 2 (trigger) and 6 (threshold) monitor capacitor voltage. ![]() The methodology involves the application of linear precision temperature sensors i.e., they generate a voltage that is directly proportional to the temperature. The power output of the circuit is cut off or switched OFF or an alarm is triggered ON if the temperature of the external input is equal to or, greater than the preset temperature value. The circuit works by monitoring temperature from an external input and comparing the temperature level with that of a preset temperature value. This research focuses on the design and construction of a Dual Sensor heat-monitoring system. Convenience and safeguarding our home appliances have become an important issue when dealing with an advancement and growth of an economy.
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