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Sonsivri > Electronics > Pic Basic Languages (Moderator: bbarney) > Picbasic pro source help
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leemarrow
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« on: April 27, 2005, 01:07:17 13:07 »
i have write a code for 16f876 for reading a temperature from a lm35cz.
Now i must subtract a vref of 2,5 volt from ad conversion result:

ADCIN 0,AD_Raw       Place the conversion of channel0 into AD_RAW
AD_Result=(AD_Raw*10) */ Quanta      ' Quantasize the result

where Quanta is 1250 (source from EXPERIMENTING WITH THE PICBASIC PRO COMPILER).

Now i have try to subtract from AD_Raw the number 25000 (2,5 volt) but it not work correctly.
which number I must subtract from AD_Raw???
(2,5 volt is my ref voltage for negative mesure)
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nimdonia
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« Reply #1 on: April 27, 2005, 02:39:02 14:39 »
is
25000 = 2.5 volt? check tht first

proly haf u make it the proper size? WORD? instead of byte
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leemarrow
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« Reply #2 on: April 27, 2005, 06:32:50 18:32 »
Quote from: nimdonia
is
25000 = 2.5 volt? check tht first

yes, 2,5 volt is 25000

i have found my error  Cheesy
the formula to calculate temperature is wrong  :rolleyes:
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