how to differentiate waveform from metal detector in arduino

[haseeb zaib]

Hi guys

I need some help regarding programming. I have made a metal detector, when metal is detected I am getting pretty clear waveform from detector

attachment ( PXL_20210702_060158139.jpg) shows waveform when no metal is near the coil

attachment ( PXL_20210702_060159594.jpg) shows waveform when metal is detected

now I am giving this waveform to arduino analog pin A0. What I need to do is when metal is detected I need buzzer to simply give a tune and other thing is to show when ferrious material is detected and when non ferrious is detected.

The only thing I am stuck at I have single signal how can I make a reference signal from it to differentiate through it, I hope u guys get what I am trying to say.

[Qiaozhi]

Hi guys

I need some help regarding programming. I have made a metal detector, when metal is detected I am getting pretty clear waveform from detector

attachment ( PXL_20210702_060158139.jpg) shows waveform when no metal is near the coil

attachment ( PXL_20210702_060159594.jpg) shows waveform when metal is detected

now I am giving this waveform to arduino analog pin A0. What I need to do is when metal is detected I need buzzer to simply give a tune and other thing is to show when ferrious material is detected and when non ferrious is detected.

The only thing I am stuck at I have single signal how can I make a reference signal from it to differentiate through it, I hope u guys get what I am trying to say.

This looks like a standard PI detector, so you won't be able to reliably differentiate ferrous from non-ferrous in the same way as a VLF.
Have a look at the Voodoo project which provides true ferrous rejection in a PI detector.

[haseeb zaib]

even if I cant differentiate ferrious and non-ferrious it does not matter right now. Right now I need to know how can I put a some kind of checker or whatever on this waveform to see when metal come near the buzzer goes high.

[green]

even if I cant differentiate ferrious and non-ferrious it does not matter right now. Right now I need to know how can I put a some kind of checker or whatever on this waveform to see when metal come near the buzzer goes high.

[Inside The Metal Detector] chapter 11

[haseeb zaib]

Thanks. I will study it hope I will find solution there