Kevin <kben <at> dca.net> writes:

> 
> I have a pic16f88, I am using the 10 bit ADC to read an
> LM34DZ. The LM34DZ puts out 10mV per degree F from 0 F to
> 100 F. I have the F88 ADC set to use VSS-VDD for reference,
> 0 to 5V.
> A couple weeks ago I was asking about a digital filter
> to improve the accuracy of the ADC reading. Can anybody
> provide me one or point to a web page that explains one.
> This is strictly a hobby type project, and the LM34DZ will
> be used in my house, so no extreme temps will be monitored.
> If someone could provide an example with numbers plugged in
> I would appreciate it.

I use a simple averaging for this.  I have a thermometer where 18F2542 reads 
LM34 and displays temp on LCD.  The ADC reads 5 samples with 10 ms delay, then 
average is used to calculate temp  and display it in C or F.  
Very simple filter, but god enough to prevent large accidental spikes due to 
noise.

Sergey
http://beaglerobotics.com



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