Impulse and unit step responses

I posted yesterday post about IIR filters but totally missed the topic which I should have started with. It's about systems responses. I had finally some time to document filters we use in code.

The Unit Step Response [lpsa.swarthmore.edu]
Link directs to the unit step response. There's tab also with the impulse response. All explained with introduction and equations followed by pictures.
Website's name is Linear Physical System Analysis. Recommended to read !

DSP Filters for touch sensing (bookmark)

I had to correct one IIR filter in touch sensing software because there was potentially one overflow in computing. This pdf from microchip contains few filters with C codes and figures how they affect the signal.
Various filters for touch sensing signals