The objective of this project is to design a temperature alarm system which measures air temperature

The objective of this project is to design a temperature alarm system which measures air temperature and provides an alert when the temperature exceeds its defined upper and lower limit. Specifically, a red LED should turn on when the temperature is lower than the lower limit or higher than the upper limit. When the temperature is between these two limits, a green LED should be on, indicating that the temperature is “normal.”
Lower limit: 70 ? Upper limit: 110 ?
The design will consist of multiple stages as shown below in Figure 1. Note that a thermistor is to be used. Also, for the “Amplification Circuit” block, use an operational-amplifier wheatstone bridge (you will need to find this on the internet). For the thermistor, you should use the internet to find a thermistor you want to use and use its datasheet. A possible alarm circuit is shown in Figure 2. Don’t forget to use commonly available parts.
Figure 1: Block diagram of temperature alarm system
Figure 2
Project Simulation: Once you have designed the circuit, build it and simulate in Multisim using tolerances.
Write a test plan and be sure to demonstrate that the specifications are met below the lower limit, in the normal range, and above the upper limit.

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