over range Compare

nicofer · Joined: 01 May 2013 Posts: 90 Location: GRJ

Hi

I need to check if a value changed , but only if more than say 2 or 3 , to eliminate sensor noise etc , any faster / better ideas .

at the moment i use :

Deltad = value - Lastvalue
Delta = Abs(deltad)
If Delta > 3 Or Opt3last <> Limitprox Then

Enchange = 1

else
Enchange = 0

End If

Lastvalue = value

Cheers

(BASCOM-AVR version : 2.0.7.8 )

i.dobson · Posted: Fri Feb 24, 2017 6:13 pm Post subject:

Hi

Why not just drop the lowest 2 bits before comparing

nicofer · Joined: 01 May 2013 Posts: 90 Location: GRJ

Hi
Now that is a cool plan , never thought of it . thanks .

Cheers

i.dobson · Posted: Fri Feb 24, 2017 8:47 pm Post subject:

Hi,

My method won't be super accurate. For example if you have the value 8 and it changes to 7 the compare will be true (1000 -> 0111).

Depending on how fast you Signal changes/what you want to do with the value, it might be better to just smooth (average) the value.

Regards
Ian Dobson

nicofer · Joined: 01 May 2013 Posts: 90 Location: GRJ

Hi ,
The plan is just to print a value if it changed but only if it changed by more than a dela value .

The values are between 0 and 4095

Cheers

i.dobson · Posted: Sat Feb 25, 2017 7:45 am Post subject:

Hi,

And what data types are your variables (word, integer, single, double)?

If you only want to print something when the value changes more than a fixed Delta ny idea wont work, But let me think about it.

Regards
Ian Dobson

MWS · Joined: 22 Aug 2009 Posts: 2262

i.dobson · Posted: Sat Feb 25, 2017 4:24 pm Post subject:

Hi,

Just because it's a 12bit value doesn't mean the OP is using a word, that's why I'm asking what type it is.

Regards
Ian Dobson

nicofer · Joined: 01 May 2013 Posts: 90 Location: GRJ

Hi
Yes , value is a word .

will have a look at your sugestion .

Thanks
Cheers