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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."

The options for the lower and upper limits are as shown below. Each teammate should pick a lower and upper limit, and these should be different than those of anyone else in the group.

Lower limit options: 40, 50, 60, 70 ℉

Upper limit options: 80, 90, 100, 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 (your team will need to find this on the internet and discuss how to properly use it in your design). For the thermistor, you should use the internet to find a thermistor you want to use and use its datasheet. Teammates must use the same thermistor. A possible alarm circuit is shown in Figure 2. Don't forget to use commonly available parts.

I am using the cutoff limits of 70F and 110F.

I have to implement with the TDK B57863S0103G040 thermistor.

The site to get the right values for this thermistor is

I have a prototype but I am not sure how to implement it the thermistor to it.

Thank you so much



Top Answer

Hello, the answer is in the file attached. In this cases I'll recommend to you use... View the full answer


Flow = 21 11 0C
-D RLOW = 11, 94 KM
THIGH = 43,33 " C - RAICH = 4,73 KN
TMID = 32 C
RMID = 7, 4 KM
R = 7,4 kn
The circuit
continues on
next post ( Fill )

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