LM35DZ/NOPB Texas Instruments Board Mount Temperature Sensors PREC CENTIGRADE TEMP SENSOR datasheet, inventory, & pricing. LM35DZ Datasheet, LM35DZ National Semiconductor Precision Celcius Temperature Sensor Datasheet, buy LM35DZ. q Low self heating (°C typical) q Output impedance Ω at 1mA q Standard T package. Pin connections. Package details. Data Sheet.

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If datasgeet get something around mV, then the problem is related to your Arduino board. Will buy one in local electronics shop and try with it. As a side note, this: D Finally, I would suggest you to isolate the variables: AVR microcontroller pins default to input, as you have said. Post an actual schematic.

LM35 Temperature Sensor

Thanks on your help guys! Email Required, but never shown.

Home Questions Tags Users Unanswered. It’s a long shot because that may already be the default, and also because the analogRead call probably does that for you. Maybe Lm35xz really got miscalibrated ones. In spite of the low quality of your second picture, with a bit of hard work and maybe some faithI can tell that your connections are correct:.

As Ricardo told I’ve tried to remove Arduino out of picture and still got 4.

LM35 Temperature Sensor

I don’t have an answer for your question, but I’ll write down what I could tell from your ratasheet. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


After several attempts I tried to measure voltage with multimeter on 2nd pin Vout and it was 4.

Finally, I would suggest you to isolate the variables: By mistake I ordered 5 pieces instead of one so I tried with all of them and they all give me same result both on Arduino and voltage measured.

Ricardo 4, 14 37 By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Post as a guest Name. Those pictures tell us nothing. Sign up or log in Sign up using Google. Do you have a scope you can look at it with to be sure it’s not noisy? Bought LM35DZ in local electronics shop and everything is working as it should. There’s got to be something in your hardware, but I don’t know what it is.

The LM35DZ datasheet output follows the formula below: If you get the same 4. If so, maybe that means the batch of LM35 you got is miscalibrated. I’ll buy tomorrow one LM35DZ in local electronics shop and try again. There’s some information on how to do it in the related question, How to calibrate a temperature sensor.


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You don’t want to be doing unncessary division at run-time. If that’s the case, you may be able to compensate for that and calibrate them yourself, by adjusting the temperature formula in your code.

LM35DZ Datasheet(PDF) – National Semiconductor (TI)

I did exactly that my English is bad and I know it! So, right there, there seems to be a problem with your setup.

Its funny, they are same, all markings and everything. Sorry on my Bad English, I’ll try to explain even more what I’ve done. Chris Thanks for the edit! Now I’m confused what is going on and why all of them return the same value? Here’s datashest post of somebody with the same problem as you.

temperature – Arduino LM35DZ giving incorrect voltage – Electrical Engineering Stack Exchange

Sign up using Email and Password. Using this code I also got 4. In spite of the low quality of your second picture, with a bit of hard ddatasheet and maybe some faithI can tell that your connections are correct: Of course this application is not a time-sensitive project, but increased efficiency should always be realized where possible.

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