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Averaging adc reading

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bjay

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I am looking for help on averaging a adc reading in assembly language
Just not sure how to do it ,,I had a go at adding 4 values together then rotate right but it didnt work correct
If anyone knows of a good tutorial or code snippets i would be very thankfull :)
cheers
bjay
 

Hi,
you are very close. It is shifting right though, not rotating. Rotating right brings the least significant bits back into the game a most significant bits. Shifting right by 2 just discards of the 2 LSBs

hth, Bob
 
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    kender

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Thanks bob

I will try shifting right ,, When i can get to it again

cheers
Bjay
 

hi,
in C language
unsigned int16 xin[5] ;
{
xin[4]=xin[3];
xin[3]=xin[2];
xin[2]=xin[1];
xin[1]=xin[0];
xin[0]=read_adc();
volt=(xin[0]+xin[1]+xin[2]+xin[3]+xin[4])/5;


}
 

Thanks oh_jani

But i am coding this in assembly
I am not using C at the moment

bjay
 

in C language
Click to expand...

you can greatly simplify and speed up the calculation if you use rolling average (aka exponential smoothing).
 

The adc works well at the moment
I was just trying to make it a little better by taking a few readings then divide
I have read a little about rolling averages but i wanted to keep it simple
I have been looking at c code of late, but you go back to what you are comfortable in
Thanks for the reply millwood

bjay
 

for beter result of adc
very simple u some change in hardware

mcu pin--------||-------GND
+ -
capcitor value 47uf

for avr and pic project vist my site avr2pic

WELCOME TO---> AVR2PIC
 
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Thanks Jani

I did that its pretty good now

Interesting website a few good projects on there

not being picky but a few spelling mistakes on the avr page

Running,Temperature,Digital,Thermometer

bjay
 

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