Electrical Engineering

Electrical Engineering

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 systemFigure 2Project 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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