FoxyPI - Arduino Nano metal detector

FoxyPI with firmware 3.6 - golden ring test:

Finds in our garden with FoxyPI (after electrolytic cleaning):

The double-pole switch with locking in the neutral position and the digital LED voltmeter allow you to determine the voltage of the uC/power battery in any mode of MD operation:

I decided to numerically evaluate the stability of my metal detector - it turned out to be quite satisfactory: after 15 minutes of operation, the detection range of targets decreases by less than 4%.

Service menu structure in version 3.5:

The FoxyPI firmware version 3.5 is ready - FoxyPIv3_5.ino.eightanaloginputs.hex

What's new:

added the ability to adjust the display contrast using the CONTRAST item in the service menu

An example is small/normal/excessive contrast:

Interference from a nearby induction energy meter:

The final firmware version 3.4 is ready - FoxyPIv3_4.ino.eightanaloginputs.hex

What's new:

• MOSFET overheating is excluded
• increased stability
• added auto-tuning interval between ADC samples
• added display of the signal curve after auto-balancing

And here is how the interference from a nearby LCD TV appears: