DELTA value

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

Hi
I need to know if a sensor value has changed more than a specified DELTA value from a previous reading .

One way is to subtract the 2 , get the ABS and compare with a DELTA value .

Is there a faster , less code , way to do this compare ? - for now I only need to know if delta is more than 2 .

A BASCOM function to perform this will be very useful. ( res = DELTA(var1, var 2 , range) )

Cheers

(BASCOM-AVR version : 2.0.7.8 )

Plons · Posted: Mon Jun 29, 2015 4:53 pm Post subject:

If you use integers, the procedure you describe will be processed very fast. Bascom is a compiler !
If you're using Singles or Doubles, it will take more time .... of course.
If you have an oscilloscope, hook it up to a free pin, set pin @ entry of calculation, clear on exit, and witness the speed of this compiler Smile

I doubt if a specific statement as you describe will be faster. And personally I prefer plain and simple code over smart statements. But that's personal ...

Enjoy!

Nard

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

Hi
Yes , at the end of the day I subtract the 2 , get the abs and do the compare and it is very fast , all on word values .
Thanks for the
reply.

Groetnis .

AdrianJ · Joined: 16 Jan 2006 Posts: 2483 Location: Queensland

I hope you mean integer, not word. word is not signed, so the result of w1 - w2 may not be what you expect. And taking the ABS of a word may not do much either.