using an LM35 Electronic temperature sensor. we are told that this electronic device produces an output voltage of 10mv per each degree Celsius. here is a pictorial depiction of how to connect this temperature sensor.
In the U.S, The temperature is read in Fahrenheit. we will do the necessary in order to produce the right reading. This reading will be in degrees Fahrenheit. we will utilize an op amp connected to the sensor. this circuit will look like this.
in order to find R1 and R2 this is the calculations that were made. Using the two equations we found a resistance ratio. and then picked two resistance that would give that ratio.
we then proceed to find Vref.
during the connection of our circuit we encounter a problem. the problem was that since our breadboard only allowed for two voltages, we need a third voltage (Vref going in our circuit). we use a resistance in order to obtain the Vref needed using voltage divider rule this is the R obtained.
After all our calculations were done, we then proceed to build our final circuit.
we then obtained the Vf which in this case is the temperature in degrees Fahrenheit. 6.59 mV(65.9 degrees Fahrenheit) and here is the percent error,
we then obtained the Vf which in this case is the temperature in degrees Fahrenheit. 6.59 mV(65.9 degrees Fahrenheit) and here is the percent error,
Overall we found out that our circuit was around 90 percent accurate in transforming degree Celsius to degree Fahrenheit.
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