Trying to use LM335...a little help please!

[Acetronics2]

Hi,

IF the voltmeter shows changes on Cathode Voltage vs Temp ... It's a SOFTWARE problem !
so, please, think to show us your program !!!

IF Not Verify the LM335 Pinout ... FIRST.

Alain

[spiced]

Hi,

IF the voltmeter shows changes on Cathode Voltage vs Temp ... It's a SOFTWARE problem !
so, please, think to show us your program !!!

IF Not Verify the LM335 Pinout ... FIRST.

Alain

yea buddy checkout the attached image.. i havnt really connected it to the ADC yet. i just want to see if it does change the voltage according to temp..

[Acetronics2]

Hmmmm,

Also remember the LM335 HATES to be reverse connected !!! ... did you ???

Alain

[falingtrea]

Is your meter good enough to measure 10 mV changes? Because that is how much the voltage changes per degree C. Per degree F is more like 5.5 mV.

Also, if your 5V has too much noise on it, you will not see the small voltage changes either. So make sure that the voltage being used to power the sensor is really clean or filtered well.

With the resistor you are using, you are only pulling 600 uA of current. If you measuring device does not have a very high impedance, it will also affect the output voltage. So try lowering the resistor to 2.2k or even 1k. You will still only be drawing a couple of milliamps.