Flesh out ///delta indication ??? with tone()?
drf5n opened this issue · comments
This bit of code plans for indicating differences in pulse length:
https://github.com/Dreamy16101976/foxyPIv1/blob/master/FoxyPIv1.ino#L212
The full code looks like it induces a pulse, and counts how long it takes the decay to cross a threshold, and alarms if the length of time is longer than the zero+PROTECT count, then beeps a constant tone.
Maybe one could map the delta indication into the pitch of a tone? Instead of:
analogWrite(beepPin, BEEP_ON)
Maybe:
tone(beepPin, map(delta,1,100,1000,2000));
To do material discrimination, it seems like it would be necessary to detect more than the threshold-crossing timing. Maybe timing a couple more thresholds would be possible
Circuit wise, I wonder if you could add a quad comparator like an $0.90 NJM2901 to pick off when the curve first falls below the diode clamp, to 3/4, 1/2, and 1/4 of the diode clamp voltage to give more data on the shape of the the decay curve for discrimination.
(I found this code while looking for pulse induction after seeing the circuit and DSP discussion at https://www.lammertbies.nl/electronics/pi-metal-detector )
Hello!
This is the first (v1), earliest and very outdated version of my metal detector software. It is laid out just as a keepsake. Therefore, it is hardly worth discussing any technical solutions in this particular version.
Best regards, Alexey
This version of your metal detection software looks like one of the more interesting code examples for pulse induction metal detectors for Arduino.
Is the test and training data in https://github.com/Dreamy16101976/nn4md from a later version of your detector software?