It doesn't look like it should be sensitive to vibration, when I look at the data sheet.
It does have a line regulation spec. If you are running the device off 12V from the vehicle, the typical 10mV/V spec would look like about a degree C variation per volt.
There could easily be interference concerns too.
If you are not completely certain that vibration is the cause, I would suggest regulating the LM35 power supply, shielding the sense voltage backto the A/D conversion point, and if you are using a metal body version of the device, that the electrical connection from the metal body to chassis ground that you are using to measure temperature is a solid connection. Perhaps this should be the single point ground for your PCB.
thanks i examined all connection ,tacking , and...
i think LM35 is weak...
is there powerful sensor that has not this problem.
but LM35 is not accurate in strong vibration ,my means it had not same data in same conditions.it is randomly increased or decreased....
thanks for reply can you introduce some sensor that is suitable for these works?I agree with the comments saying that the vibration sensitivity is unlikely caused by LM35 sensor. But whatever causes the problem in your circuit, it seems obvious that this type of sensor isn't suited for engine measurements. I would consider industry standard resistance thermometers and thermo elements in a first place. Special types with mounting options are available,
hi, i want to buy a good sensor, i want to know your opinion,
is this sensor PT100 good for vibration case like engine car?
thanks for reply,my means when sensor is worked now ,the temperature result is for example:I also do not understand clearly the title: why sensor LM35 temperature sensor doesn't return same data in fixed conditions...
yes,your words is completely true.I do not expect the sensor to find out whether the engine is running or not!!
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