Subject:
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RE: LM35 Temp Sensor
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 29 Jun 1999 16:44:22 GMT
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Original-From:
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Dito, Paul <PCD@ihatespamDOLBY.COM>
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Viewed:
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937 times
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The output pin of the LM35 gives you the ambient temperature in 10mV/degree
C directly. The 47k pullup resistor will form a voltage divider with the
output. You either have to do some conversion (complicated) or eliminate the
pullup (easy)....
Paul
-----Original Message-----
From: Jonathan Swaby [mailto:jonathan.swaby@vpss.gatech.edu]
Sent: Monday, June 28, 1999 3:53 AM
To: Jose Luis De Filpo
Cc: handyboard@media.mit.edu
Subject: Re: LM35 Temp Sensor
I have a couple of LM335 that I have tried to use with the miniboard. The
numbers I get when converted to Fahrenheit, do not accurately represent the
room temperature. The docs mention using a 10K pot to calibrate the sensor.
I have not yet tried this, but it is my next step. The Robot Bonanza book
has a couple of circuits that use this sensor. I have not tried either
circuit from the book. I do have a handyboard, but I have not tried the
sensor with it, but the results should be that same with either board. They
both use the 47K pull up resistor.
At 12:50 PM 6/26/99 -0300, Jose Luis De Filpo wrote:
> Hi,
>
> Has someone tried to connect a LM35 temperature sensor to an analog input
in
> the HB, I have had no luck with it, I have plugged it directly to the input
> and think that maybe is the 47K pull-up resistor the cause of the problem.
>
>
> Thank You
>
>
> Jose Luis
>
>
>
Jonathan Swaby
Computer Services Specialist IV
Student Affairs
404-894-5889
GeorgiaInstitute
ofTechnology
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