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Smoothening ADC data results : )


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Freddy

Tue Oct 07 2008, 08:06AM

Registered Member #9399

Joined: Mon Jul 28 2008, 10:01PM

Posts: 37
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Hi there,

the other day I built a temperature sensor using AT89S51 and ADC0844, but then the temperature display fluctuating result (about a certain value). Because, I took each reading (from ADC) and then displays it. I thought this is the hardware problem i.e. lack of signal conditioning circuitry or etc.

Then, I got this idea from my lecturer to do averaging.

So, what I did was took 255 readings, sum them up and divide by 255. The result then is displayed. Now, the result is steady and not fluctuating.

Note that to sum up 255 8-bits data would produce 16-bit result. So, this require 16-bit addition operation for the 8051.

I also used 16-bit division to divide the sum by 255d (FFh) to get the average.

Just my 2 cents

Build target 'Target 1''
linking...
Program Size: data=8.0 xdata=0 code=709
creating hex file from "Final Year Project"...
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shyam

Tue Oct 07 2008, 08:18AM

Registered Member #2984

Joined: Mon Aug 06 2007, 11:33AM

Posts: 723
Thanked 107 times in 103 posts

hi freddy!!!

gr8 thinking...
also refer

http://www.8051projects.net/forum-t7667-post.html
http://www.8051projects.net/lofiversion/t5070/c8051-adc-in-c--programming.html

lProgress is not made by early risers or hard workers, but by LAZY people, trying to find easier ways to do the same........


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