In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Beau Schwabe wrote:

There are several ways to do this.  Below is basically a digital low pass filter...

This method allows you to dynamically set the number of samples without using the variable space to hold each sample.

[code]
New = {Sensor reading}
DataBuffer = DataBuffer - Avg + New
Avg = DataBuffer / Samples
[/code]

If 'Avg' is a BYTE variable, and 'DataBuffer' defined as a WORD, you can effectively hold an Average consisting of a maximum of 255 samples.  If 'Avg' is a NIB, then 4096 samples can be achieved.
The variable called 'Samples' can be a constant therefore not impacting the available variable space.

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