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LM34DZ Issue?  


KK4EJ
(@kk4ej)
New Member
Joined: 10 months ago
Posts: 4
Topic starter  

Trying to use a LM34DZ temperature sensor. I went by the directions from the data sheet and no output.

I am lost on why it has no output, tried 6 different modules. Simple to add 5 volts, ground, should give me 10mv/deg F. 

Anything special from a LM34 to a DZ? Data sheet just shows it as a TO92 package and temperature range. 

Flat face facing, VCC, data and gnd from L to R.

Anyone have any suggestions? Any chance of a different pinout?

Frustrated.....

As for my project: I want to use six of these, feeding analog pins, sample it to get temperature. These will monitor the water temperatures going in and out of a geothermal heat pump I installed last year.

Randy


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DroneBot Workshop
(@dronebot-workshop)
Workshop Guru Admin
Joined: 2 years ago
Posts: 908
 

@kk4ej

I saw this when you posted it yesterday and have been trying to figure out what could be wrong. It certainly sounds like you have them hooked up correctly. 

They are generally very straightforward to work with, I used an LM35 in my Measure Temperature with an Arduino article and video, and it was pretty simple to use.  The only difference between the LM35 and LM34 is the units they use, the LM35 outputs in Celsius.

As far as I can determine the "DZ" designation just refers to the package and maximum temperature rating, and shouldn't affect you unless you plan to measure some very hot temperatures.

I'm assuming you bought these from a reliable source, as I did see a post on an Arduino forum about some nasty sellers on eBay rebranding common transistors and selling them as LM34's.  Those "5 pieces for 4 dollars" listings on eBay look somewhat suspicious, as that's the cost for just one of them on DigiKey.

Otherwise, I am at a loss as to what to suggest.  I really responded to your post just to bump it back to the top, as perhaps some other folks have a suggestion. 

Sorry I couldn't have been of more assistance.

😎

Bill

 

 

"Never trust a computer you can’t throw out a window." — Steve Wozniak


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KK4EJ
(@kk4ej)
New Member
Joined: 10 months ago
Posts: 4
Topic starter  

Thanks Bill.

These were bought from a futurlec. 

Not sure what else to try. I used a LM34 years ago setting up a temp monitor at a broadcast transmit site, worked flawless. 

Little thing like that bugs me lol.

Randy

Randy


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