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.

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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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. was first posted on July 14, 2019 at 10:11 am.
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