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In this paper, the design and implementation of a temperature sensor with indicator lights for increasing temperature levels was designed and implemented. The circuit will trigger a single LED at 80 ºF, 85 ºF, 90 ºF, and 95 ºF based on the output of a temperature sensor. This paper covers the initial design process of the circuit, computer simulations in order to verify functionality, and laboratory measurements of the finished circuit. An effective circuit was designed and the circuit was successfully implemented. It is often useful to have a sensor to monitor temperatures in a circuit element. The circuit described in this paper indicates four distinct temperature levels (80 ºF, 85ºF, 90 ºF, and 95 ºF) via the use of LED’s. A temperature sensor that output a specific voltage per temperature was used in conjunction with a quad op amp in a voltage comparator configuration in order to act as a switch for each LED. The circuit was powered by a 9 V battery, and a zener diode was employed to prevent unwanted voltage drops in important elements as the 9 V battery drained during use
Additionally, the paper explains information regarding comparator, voltage drop, source, constant, node, sensor circuit, temperature sensor circuit, and zener diode.