Hello Dennis,
Yep...I changed the wiring and changed a uEnv.txt file in the /boot
directory. I have the P9_40/AIN1 pin connect now instead of the P9_39/AIN0.
When I stated that I changed a file, I changed the file to enable
BB-ADC1,BB-ADC2 instead of having it enabled at BB-AIN0, BB-AIN1.
The software is completely different too. I used this set of software to
check the TMP36 just like the older software I used in a post not too long
ago.
Seth
P.S. I will work backwards like you are discussing and I will keep trying.
I know I should have some pins enabled with my Cape Universal disabled. I
am probably way off base but this is what I have done so far. Sorry for not
giving every detail. I will wait to hear from you again while attempt to
work some magic.
On Monday, July 10, 2017 at 9:27:41 PM UTC-5, Dennis Lee Bieber wrote:
>
> On Mon, 10 Jul 2017 16:10:50 -0700 (PDT), Mala Dies
> <fun...@gmail.com <javascript:>> declaimed the following:
>
> >
> >I have another set of software that I picked up along the way, i.e.
> >probably from that book, "Evil Genuis," series from Mr. Rush. Anyway,
> here
> >goes it. Oh but first, I know people are getting tired of seeing the same
> >ole, same ole. This does not discourage me from posting.
> >
>
> What is discouraging is the lack of any attempts to analyze/debug
> the
> problem... Posting code samples from books, stating an invalid result, and
> that is where the effort seems to end.
>
> >*var b = require('bonescript');*
> >
> >*var inputPin = "P9_40";*
> >
> >*getBeagleTemp();*
> >
> >*function getBeagleTemp() {*
> >* var value = b.analogRead("P9_40");*
> >
> >* var millivolts = value * 1800;*
> >* var x = (millivolts - 500)/10;*
> >* var z = (x * 9/5) - 32;*
> >* setTimeout(getBeagleTemp, 10000);*
> >
> >* console.log("x=" + x + "\tz=" + z);*
> >*}*
> >
>
> >I am getting temperatures in the Fahrenheit of 201 and in Celsius of 129.
> >This is not my temp. in the house.
> >
>
> Again, work the results backwards to figure out the numbers
> (again,
> ignore Fahrenheit).
>
> x = 129
>
> 129 = (mV - 500) / 10
> 1290 = mV - 500
> 1790 = mV
>
> {Not important, since it just converts the voltage back to the analogRead
> 0..1 range
> mV = val * 1800
> 1790 = val * 1800
> 1790/1800 = val
> 0.9944 = val
> }
>
> Before, the reported temperature was near -50, now it is near
> +130.
>
> -50 is GND (0.0V), +130 is maximum (safe) for BB (1.8V). The minor
> differences could be capacitive coupling and cross-talk on the wiring.
>
> My only logical conclusion is that you have changed the wiring
> some,
> and are not properly connected to the TMP36, instead somehow being
> connected to either the GND or the ADC-Voltage source.
> --
> Wulfraed Dennis Lee Bieber AF6VN
> wlf...@ix.netcom.com <javascript:> HTTP://wlfraed.home.netcom.com/
>
>
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