LM35 and PIC16F690
Hello.
I need some help. I want to build a PIC16F690 and LM35 thermometer, but fail to properly setes ADC conversion and relationship. I realized I applied input assembly and a Trimmer 150mV and indication on the display is 501. And not really understand why. Any advice is welcome.
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Hi, Mihai
the problem is here:
you declared " Grade " as a byte, and " grade " is obviously > 500 !!!Code:grade=(5*temp*100)/1024
so, here, you need to use DIV32 ... as somewhere in the operation you will get an overflow over 65535 ... ( > WORD )
declare
grade VAR WORD
dummy VAR WORD
and try, as a calculation
AlainCode:dummy = 500*temp grade = DIV32 1024
Last edited by Acetronics2; - 26th June 2010 at 19:06.
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Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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IF there is the word "Problem" in your question ...
certainly the answer is " RTFM " or " RTFDataSheet " !!!
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