Arduino metal detector?

[kosacid]

lol it go`s to sign wave when metal is near the coil im using a lm358 opamp

[homefire]

Ok, See if the Cap stretches that out.

[bernte_one]

some News on this Project?

[jlsilicon]

What is the VD3 in the Schematic ?
- The spec calls it a 3pin VRef .
- But the schematic shows its config as a Diode.

How do I connect this ?

[Altra]

Look here

http://www.ti.com/lit/ds/symlink/lm385-1.2-n.pdf

[jlsilicon]

ok, thanks !

[FoxyLab]

Hex-file FoxyPi (version 2.11) for Arduino Nano 3.0 - https://acdc.foxylab.com/sites/defau...aloginputs.hex
How to flash (in russian) - https://acdc.foxylab.com/avrdude

[Joo]

> I want to make VLF MD with Arduino Atmega328, what is the scheme of the front (Coil and Buffer) so that it can be connected to the Atmega analog pin?

[ivconic]

> I want to make VLF MD with Arduino Atmega328, what is the scheme of the front (Coil and Buffer) so that it can be connected to the Atmega analog pin?

https://github.com/dc42/arduino/tree.../MetalDetector

[FoxyLab]

FoxyPI v3

The third version of pulse metaldetector on Arduino Nano (FoxyPI v3) (transition to the use of the Arduino ADC and dynamic mode) is ready.
Firmware (hex-file) and description (on russian, edited under the third version) - https://acdc.foxylab.com/node/47
Test video -

[6666]

Hi Foxylab thanks for the updates

[6666]

PULSE RATE - pulse repetition rate (10/20/30/40 pps)

Foxylab I am curious for your reason why you choose a very low pulse rate ?

[FoxyLab]

PULSE RATE - pulse repetition rate (10/20/30/40 pps)

Foxylab I am curious for your reason why you choose a very low pulse rate ?

I compare the differences in the curves for two adjacent pulses. If you take the frequency higher, the difference will be less noticeable (worsening, if I may say so, the signal-to-noise ratio). For coil speeds up to a meter per second, sensitivity at such a low frequency is quite acceptable.

[FoxyLab]

Version 4 underway. Static mode (and 30 pps) will be back , but with ADC use and integration (unlike comparator use in version 2) and better stability.

[waltr]

Version 4 underway. Static mode (and 30 pps) will be back , but with ADC use and integration (unlike comparator use in version 2) and better stability.

I read your web site (used Chrome translator) and very nice project and write up.
Also read your explanation of discrimination with Neural nets. Very interesting.
Have you been able to add this neural net into your detector?