It's a very simple class that filters a value over time, to minimize aleas. It gives about the same result as a running average, but without the problem of using huge amount of memory to store previous values.
It simply adds the current value to the previous one, by applying a coefficient to both.
It has been written to filter analog inputs readings.
It uses fixed point math to get lighter and faster computing.
begin() only affect an initial value to the filter. Pass a uint16_t (or unsigned int on 8 bit atmega).
setCoef() give the filtering coefficient. Pass a uint8_t. 255 is no filtering, 0, is no evolution !
filter() apply pass the given value (uint16_t) through the filter, and returns the filtered value.
getValue() returns the last value returned by the filter. May be usefull if needed several times.
This has been written fast, and bare minimum, to suit a project where heavy filtering of analog inputs was needed. It could benefit from a template, so it can handle several object types. One day maybe !