Can em frequencies be filtered with arduino?

[aozdemir58]

For example, a similar issue is mentioned here, but it is not explained whether there is a solution or not.

What does IIR and FIR filter are used for in embedded

I dont know if this is the right place to ask this question, but I am asking anyways. I am working on a metal detector basically I am writing its firmware. What I need to do is that data coming from metal detector,I need to analyze and according to that signal if there is metal in front of detector I need to sound the buzzer. Now what problem I am facing is that there is no reference signal, there is only one signal which is coming from metal detector and that signal range is from 0 to 8v(obv i …