In this video, you'll learn how a lowpass filter works and how to implement it on an Arduino to process signals in realtime.

You don't have to be a mathematician to design your lowpass filter. You can use libraries to do the work for you. The python scripts linked below can help you to get started.

https://github.com/curiores/ArduinoTu...
https://github.com/curiores/ArduinoTu...

The Arduino examples are also available:
https://github.com/curiores/ArduinoTu...

There's also a highpass version now:
https://github.com/curiores/ArduinoTu...
with a few details about the derivation here:
https://github.com/curiores/ArduinoTu...

To use the Jupyter Notebook, start by following the instructions to download Python:
https://wiki.python.org/moin/Beginner...
and then follow the instructions to install Jupyter:
https://jupyter.org/install.html

Correction(s):
@ 9:28, the Butterworth filter sum should be from 0 to n.