Smart Hunter Metal Detector on a Smartphone

Smart Hunter Metal Detector on a Smartphone”Smart Hunter Metal Detector on a Smartphone” is a project that will help you assemble a simple and powerful metal detector on a smartphone. This metal detector is based on an Arduino micro-controller and a smartphone (Android). Here you will find all the video instructions for assembling this metal detector. Follow the step-by-step instructions. This metal detector  can see the gold ring at a depth of 30 cm, and the lid of a pot with a diameter of 20 cm can be seen at a depth of 90 cm! Start now and build your very own Smart Hunter Metal Detector on a Smartphone.

The premium version differs slightly from the free version in that it already contains an internal generator, so there is no need to use Arduino or MOSFET, which makes it easier to assemble. In this case, the application already has a built-in generator. The operating frequency of the generator can be selected directly from the application menu. The operating frequency of the generator is from 20 Hz to 20 kHz, but in our case we use from 4 kHz to 20 kHz, since the operating frequency of most “VLF” metal detectors is in this range. The assembly is similar to assembling the free version, only instead of the Arduino, we connect an amplifier to amplify the generator signal from the smartphone, which is much cheaper.

The principle of operation of the internal generator is simple: the generator built into the application generates a set frequency in the form of a sine wave and is fed to the transmitting coil, but since the signal is weak and there is not enough energy to start the transmitting coil, we amplify it with an amplifier. You can find many cheap amplifiers on Aliexpress, in the video tutorial I use one of these amplifiers.

Smart Hunter Metal Detector on a Smartphone

This amplifier is very cheap and only has an input / output and a “5 volt” supply. The take-up coil remains unchanged as in the diagram. That is, we assemble the receiving coil as in the diagram, but we will not need the part of the circuit where the Arduino is located and the transmitting coil in the premium version. There are many schemes on the Internet how to assemble an amplifier, so if someone does not want to buy, he can assemble it himself. This amplifier that I use in the video gives 3 watts if you have a large coil then you can put an amplifier up to 15 watts (depending on the size of the coil). Below in the “Free version” section there are video instructions for assembling and configuring the coils, as this process is the same for both versions. In the video tutorials that you can find below, you can see how it all works!

In principle, any amplifier with little “noise” can be used. I chose this model because of the cheap price. The quality has not yet been tested but so far everything is working well. The link to the Aliexpress page where you can buy this amplifier is just below. At the time of publication, a package of 10 pieces costs 120 rubles. We only need one amplifier, the rest will remain in reserve.

Details for the Premium version

  • Resistance at 2K
  • 2 Diodes N4148 (can be replaced with others).
  • 3 Capacitors at 1 mF
  • Plug “MiniJack 3.5 mm” for 4 pins
  • Copper enameled wire with a diameter of 0.6 mm (for the transmitting coil)
  • Copper enameled wire with a diameter of 0.2 mm (for the receiving coil)
  • Amplifier (either homemade or as in the video)
  • 5 volt power supply

Video instructions “Premium version”

Free version

This version of the metal detector, unlike the Premium version, does not contain an internal generator, so we assemble the generator on an Arduino and amplify the signal using MOSFET. In both versions, the assembly is the same except for the generator (the Premium version has a built-in generator, so we do not use arduino and MOSFET). The scheme for both versions is the same, the scheme can be downloaded above.

The details we need

  • Arduino nano or Arduino uno
  • MOSFET IRF740 (can be replaced with another one)
  • Resistance at 10K
  • Resistance at 2K
  • 2 Diodes N4148 (can be replaced with others)
  • 3 Capacitors at 1 mF
  • Button
  • Plug “MiniJack 3.5 mm” for 4 pins
  • Copper enameled wire with a diameter of 0.6 mm (for the transmitting coil)
  • Copper enameled wire with a diameter of 0.2 mm (for the receiving coil)
  • 5 volt power supply

Video instructions

How to assemble a circuit:

Coil Assembly / PART 1

Coil Assembly / PART 2:

Coil Assembly / PART 3:

Beach check:

Original thread her:

 

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