Read Data LM35 using NI MyRio

[tiarahardiy]

hi, i'm using lm35 for temperature sensor and my data acquistion using NI MyRio 1900. i got problem , normal temperature is correct showing 25 but when given a hot temperature, the temperature should rise but the temperature actually drops below 25. Here is my program.

[Bob_Schor]

No, that's a picture of the Block Diagram of your LabVIEW Program.  Attach the Program (hint -- it is a file with the extension .vi, unless you are using NXG).

Bob Schor

[JB]

How is the sensor supplied and connected to NI's interface ?

If you measure its output with a voltmeter, is it correct (250mV for 25°C) ?

How is the Express VI configured ? Why do you divide its output value by 2 ?

[tiarahardiy]

based on tutorial youtube, the sensor is supplied and connected to the NI interface as shown in the picture I inserted.

actually the output measurement is 500 mv for 50 °C,  because I read the datasheet the normal temperature is 250 mv then I divide it by two.

[tiarahardiy]

here is my vi

[JB]

As you know (you wrote it in the documentation of your VI) the scale factor of the sensor is 10mV/°C.

Therefore you only need to multiply its output voltage in [V] by 100 (or to divide it by 0.01) to get the corresponding temperature in [°C].

500mV for 50°C --> 10mV/°C --> correct. At what temperature is the output voltage no longer right ?

[JB]

The Express VI can't be opened without a NI MyRio.