» Electronics » Metal detectors »The easiest metal detector with discrimination of metals" Kid FM "

The simplest metal detector with discrimination of metals "Kid FM"


I present to you a very simple scheme metal detector called "Baby FM".

This device has a very important function, it has the selectivity of metals.

The kid FM determines the type of metal, Color or black, which is reported by a characteristic sound.

That is, on black metal, it beeps with one sound, and in color with another.

Here is the circuit itself

The MD contains a minimum of details, because the microcontroller is used in its circuit, it is very easy to assemble, but its detection depth is not very good, from 3 cm to 10-12 cm, which is basically normal for such a simple device. The device has a button for detuning from the ground.

To build, we need:
1) PIC12F675 or 629 (microcontroller)
2) Quartz 20MHz
Capacitors
3) 15pF-2pcs (ceramic)
4) 100nF-1pcs (ceramic)
5) 10uF (electrolyte)
6) 100nF-2pcs (film) and not any other
7) Speaker
8) Button

470 ohm and 10 kΩ resistors

AMS1117- 3.3 volt voltage regulator

The device is very simple and I decided to assemble it without any printed circuit boards. We take a piece of textolite or thick cardboard

We drill holes for parts. As indicated in the diagram

Once again, 100nF capacitors must necessarily be film, as in the photo. With others, it’s not a fact that it will work.
The simplest metal detector with discrimination of metals

We put all the details as shown in the diagram, solder them together.


This is how the voltage regulator looks and how it should be connected.

Next, you can proceed to the manufacture of a search coil.

For winding the coil, we take any pan or pot, but anything of a suitable diameter. I shook the pan. The wire is preferably 0.3 mm, but I had 0.4 wound it.

That's what it should be

The coil must be stiff and tight. To do this, wrap it with tape, very tightly.


In order for our device to not respond to interference and not give false positives, the coil must be shielded. We take a simple food foil and wrap it with a coil.

The main thing is that the ends of the foil do not close. We wind the wire at one end of the foil and tightly wrap the entire coil again with tape.

We connect the coil, and connect the wire from the foil to the negative on the board.

Now it remains just to flash the microcontroller and that's it, the firmware is below.

For this metal detector you need to connect the headphones from the player, but I only had a small speaker, so that the sound is heard poorly, it will be heard well with the headphones.

You do not need to configure anything, the circuit is simple and basically always works the first time (I always have it the first time)

Whoever doesn’t have a programmer for firmware microcontroller, please contact help with already flashed or in the comments

HERE VIDEO WORKS


FIRMWARE Metfmv4.rar [1.66 Kb] (downloads: 3387)
10
9.3
8.8

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16 comments
Not particularly important, as power comes from a 9 volt battery, take it to a minimum
pah watt ????
what exactly do capacitors
3) 15pF-2pcs (ceramic)
4) 100nF-1pcs (ceramic)
5) 10uF (electrolyte)
6) 100nF-2pcs (film) how many volts?
Take off the signet)
A pinpoint is usually made on a ferrite core. For example, like "Gnome"
The controller cost me 27 UAH. and flash 35 UAH. take the firmware immediately with you
[b] [/ b] mezencev1946. I would like to know: how much and how much will the stitched controller cost?
no, of course, firmware is required
And if you do not flash the controller will not work ???
Gregory
(The main question is, how did you find out the required inductance for the circuit?) What is needed for 1250 μN, I thought on a program that I would need to get such an inductance 76 turns 0.3 (4 layers), otherwise I did it for whatever I caught for a short distance. ..
Author
just need a regular copper wire, the main thing is that it is covered with varnish (varnished copper wire)
It is possible that the coil was an ordinary copper wire not inscribed
Author
I don’t have the source, because I didn’t write the program. The firmware was found on the Internet
Vladlog
Hello!
I really liked the idea of ​​using a microcontroller, but I only have pic16f1829. Is it possible to get the source to port it for my controller?
Thanks and good designs!

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