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Posted by Ken Fisher [Email] (more from Ken Fisher) on Thu, 6 Aug 2015 10:25:25
In Reply to: Any idea what kind of diode this is?, Bill Homer
[Profile/Gallery]
, Mon, 3 Aug 2015 19:05:24
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One of the first things I learned in an analog design class at Northeastern University was that the forward bias across a PN junction (diode or BJT transistor) changes 25.5 mv/ degree Celsius. So you could use anything, a 1N4003 diode or the emitter/base junction of a 2N3055 transistor (NPN) as your sensor.
I know that the EDU slot ranges the output with a maximum display value of 122 deg F (50 C). I don't know what the bottom end of the range is. I now live near Burbank, CA and only see readings as low as 24 deg F (-4.4 C).
You now have a science fair project to produce a working sensor.
Best regards, Ken
posted by 64.134.222...
Posts in this Thread:
- Outside Air Temperature - Calibration Possible?, Bill Homer
, Mon, 27 Jul 2015 07:57:38- I believe no connection to ACC, David Ingram, Tue, 28 Jul 2015 11:53:12
- Thanks for the correction!, David Ingram, Wed, 5 Aug 2015 13:55:43
- Re: EDU pin 18, outside temperature, goes to ACC. n/m, Street, Tue, 4 Aug 2015 03:02:32
- Re: I believe no connection to ACC, TML
, Fri, 31 Jul 2015 08:10:41
- Re: Outside Air Temperature - Calibration Possible?, LJS, Tue, 28 Jul 2015 09:59:40
- Re: Outside Air Temperature - Calibration Possible?, BobS, Mon, 27 Jul 2015 11:20:40
- Re: Outside Air Temperature - Calibration Possible?, JerseySaab
, Mon, 27 Jul 2015 09:26:12
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