jeroendoggen / arduino-signal-filtering-library Goto Github PK

Add code (use other lib?) to get a fixed sample rate

How to structure the filters (OOP design)
(partial) Filter implementations?
http://spuc.sourceforge.net/

http://stackoverflow.com/questions/1761212/any-good-c-c-dsp-library

Lots of filters: (BlkDSP.cpp)
http://www.icst.net/research/projects/dsp-library/

Add some documentation, describing practical use and limitations

I download the zip file and put 'Filter' into the arduino library. however, the iirFilter example won't pass the compile, errors including:

In file included from V:\temp\stone\vineyard\Arduino\hardware\arduino\cores\arduino/Printable.h:23,
from V:\temp\stone\vineyard\Arduino\hardware\arduino\cores\arduino/Print.h:27,
from V:\temp\stone\vineyard\Arduino\hardware\arduino\cores\arduino/Stream.h:26,
from V:\temp\stone\vineyard\Arduino\hardware\arduino\cores\arduino/HardwareSerial.h:28,
from V:\temp\stone\vineyard\Arduino\hardware\arduino\cores\arduino/Arduino.h:215,
from V:\temp\stone\vineyard\Arduino\libraries\Filter/firFilter.h:6,
from iirFilter.ino:2:
V:\temp\stone\vineyard\Arduino\hardware\arduino\cores\arduino/new.h:21:40: error: macro "__cxa_pure_virtual" passed 1 arguments, but takes just 0
In file included from V:\temp\stone\vineyard\Arduino\hardware\arduino\cores\arduino/Printable.h:23,
from V:\temp\stone\vineyard\Arduino\hardware\arduino\cores\arduino/Print.h:27,
from V:\temp\stone\vineyard\Arduino\hardware\arduino\cores\arduino/Stream.h:26,
from V:\temp\stone\vineyard\Arduino\hardware\arduino\cores\arduino/HardwareSerial.h:28,
from V:\temp\stone\vineyard\Arduino\hardware\arduino\cores\arduino/Arduino.h:215,
from V:\temp\stone\vineyard\Arduino\libraries\Filter/firFilter.h:6,
from iirFilter.ino:2:
V:\temp\stone\vineyard\Arduino\hardware\arduino\cores\arduino/new.h:21: error: variable or field '__cxa_pure_virtual' declared void
iirFilter:12: error: cannot declare variable 'Filter' to be of abstract type 'iirFilter'
V:\temp\stone\vineyard\Arduino\libraries\Filter/iirFilter.h:10: note: because the following virtual functions are pure within 'iirFilter':
V:\temp\stone\vineyard\Arduino\libraries\Filter/Filter.h:16: note: virtual void Filter::printSamples()

As a beginner, I don't know what cause the error and how to fix them.
Can you please help ? Thanks in advance.

Hi ! Do you support your library still ? I can not setup library.

It would be a great option if the amount of samples taken in the median filter can be more than 3.

I would say give begin(number of samples) a parameter that initiates the array for data. This would make it a lot more usefull.

Some filter are not yet moved from old version to new version (low pass: bessel,...)

Append zero's in front
similar to: http://www.phanderson.com/arduino/arduino_display.html

If you support filters now, medianFilter no compiling, maybe after installing arduino 1.8.19. Thank you

Add "debug defines" to trade off debugging options vs code size (+add some optional debugging functions)

Using: https://github.com/mmurdoch/arduinounit

FIR vs IIR
Lowpass vs highpass
1st vs 2nd vs 3rd order
linear vs non-linear

What is best for:

• readability
• ease of use
• performance

Hi, I tied to use your lib, but for both IIR and FIR, when I touched the analog pin0, and changed the delay to 50, I've got negative values. Median filter was working fine.

like this:

In: 519 - Out: 521
In: 516 - Out: 518
In: 504 - Out: 511
In: 492 - Out: 501
In: 481 - Out: 490
In: 499 - Out: 490
In: 539 - Out: 513
In: 527 - Out: 529
In: 618 - Out: 563
In: 609 - Out: 602
In: 729 - Out: 142
In: 732 - Out: -423
In: 745 - Out: -541
In: 711 - Out: -575
In: 661 - Out: -616
In: 631 - Out: -145
In: 751 - Out: -6
In: 765 - Out: -435
In: 742 - Out: -533
In: 673 - Out: -590
In: 701 - Out: -618
In: 769 - Out: -587
In: 751 - Out: -561
In: 765 - Out: -557
In: 705 - Out: -574
In: 696 - Out: -605
In: 691 - Out: -617
In: 685 - Out: -623
In: 682 - Out: -628
In: 677 - Out: -633
In: 673 - Out: -638
In: 668 - Out: -642
In: 664 - Out: -646
In: 659 - Out: -651
In: 656 - Out: -143
In: 651 - Out: 478
In: 648 - Out: 611
In: 642 - Out: 637
In: 639 - Out: 640
In: 634 - Out: 638
In: 631 - Out: 634
In: 626 - Out: 630
In: 623 - Out: 626
In: 618 - Out: 622
In: 614 - Out: 618
In: 610 - Out: 614
In: 605 - Out: 609
In: 601 - Out: 604
In: 599 - Out: 601
In: 595 - Out: 598
In: 592 - Out: 594
In: 588 - Out: 590
In: 585 - Out: 587
In: 582 - Out: 584
In: 579 - Out: 581
In: 577 - Out: 579
In: 574 - Out: 576
In: 573 - Out: 574
In: 556 - Out: 567
In: 566 - Out: 562
In: 552 - Out: 559
In: 558 - Out: 556
In: 545 - Out: 553
In: 546 - Out: 547
In: 538 - Out: 543
In: 539 - Out: 540
In: 536 - Out: 538
In: 533 - Out: 535