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Arduino Metal Detector[HOW TO]? Answered

Hello. I LOVE treasure hunting, but I don't have enough money to buy a metal detector.. Yesterday I bought an Arduino Duemilanove on ebay, the only thing I know is taht its an Atmega 328. Does anyone have any tutorial on how to build it? Please don't give me schematics because I have a bad time reading them, as I'm a mechanic not an electrician. So, I need a tutorial that explains the circuit and the code too. I know I ask much but I really want this metal detector really bad..


I was wondering if you could send a picture of how you build this?

I already saw this but i don't know how to build it.. I really have NO knowledge in electronics in general.. I can download the code, upload it to the arduino and build the search coil, but the rest is unknown to me.. a schematic won't help me much, as i don't know how to read that either.. using a breadboard is out of sight, but i can connect all the electronics together and solder them if you the owner of the video would tell me how and what electronics..


Check the simplified circuit:




Could you please review your diagram, I think you are missing a couple of connections ( and maybe one of the resistances is wrong).

I'm also trying to build the metal detector with limited success, and I would like to try your design.



4 years ago

Have a look at this web site shows how to make a metal detector.

Like I said before the bigger coil diameter the deeper the the detect ability.

On dual coil the linear separation determines depth.

A very simple circuit below but it does use an IC integrated circuit.


Really you don't need an Ardruino to make a metal detector, I made my metal detector by getting a small, handheld radio and a calculator. First you turn on the radio to AM and find a station with just static and then you turn on the calculator and tape it to the back of the radio. When it detects metal the static should get louder.

Yeah I saw something like that on google, but what depth does it have? Can I actually use it for treasure hunting? I would need around 50cm depth..

I don't know about depth...I just saw this on the show Curious George. LOL!


4 years ago

How does a metal detector work ?

1] Generate a magnetic pulse controlling amplitude and width maybe rise and fall timing in an air coil whose diameter determines distance.

2] Measure the echo on a second coil and time the reaction amplitude, width and possibly shape.

3] Compare the returned pulse to a nothing but ambient environment reference return.

4] Each primary metal alters the magnetic pulse differently

5] A uP can change pulse amplitude and duration. Short pulses are affected more by non-ferric metals with target metal conductivity affecting the reflected amplitude.

6] Water and dissolved salts in the ground affect the return pulses.

7] A low power analog microcontroller can perform this function eloquently.. Even a simple Atmega with an ADC and a DAC can make a working metal detector.

8] Software is developed by trial and error.



As far as I know, metal detectors aren't programmed, they are tuned, like radios.

Do a search for "metal detector" in the box at the top-right, and you'll see what I mean.