This article will look at a simple example of a metal detector based on the Arduino microcontroller. Its feature is that the device is made in the form of a glove, there is both the electronic part and the search coil. The metal detector was created to search for the house of lost small metal things, for example, earrings, rings and other things. However, on the basis of this scheme can be made and a classic metal detector for work on the street. To make the device will need a minimum of materials, the lion's share of problems solves the microcontroller Arduino.
The power of the metal detector is small, but for everyday purposes it is enough.
Materials and tools for manufacturing:
- Arduino UNO microcontroller;
28 caliber wire (diameter 0.32mm);
One switch
- piezozummer;
Two resistors per 10K;
One resistor at 1.2K;
Two 100n capacitors;
Two 22n capacitors;
One BC547 transistor;
9B battery
Construction gloves.
You will also need plywood, wood glue, soldering iron, a long-distance wire, a mock board and other little things
The process of making a metal detector:
Step one. Making a coil
To make a coil, it needs to cut the base, the body. The author cuts a coil of plywood on the machine, its diameter is 6 inches. The result is two rings, which are subsequently glued together by carpentry glue. After drying, the coil is carefully treated with sandpaper to make it smooth. Once the base is made, it can be reeled wire. In total, you need to make 30 turns of the wire, leaving the end of the length of at least 5 inches to connect. You need to wind the wire tightly, it will ensure the quality of the coil. On top of the wire coil can be wrapped with tape or tape for better fixation.
Step two. Build a diagram on a layout
To make sure that the coil is assembled correctly and the whole system works correctly, it first needs to be assembled on the layout board, and then to sleep. The order of connection is not fundamental, the author started with a transistor, then went resistors and capacitors. After that, "male and female" connectors were connected on the Arduino ward.
You can then plug in the coil. Since the wire has a lacquer coating, it should be scraped at the ends with sandpaper or a sharp knife. We need to get good contact. The coil is connected with the help of "male and female" connectors. Once you've assembled all the items in the controller, you can download the firmware and check how it works.
Step three. Installing firmware and checking the system
Next, you need to load the firmware into the controller. You may also need to make some adjustments in the code to make the metal detector work properly. Once the code is downloaded, you can start testing. You need to connect the 9B power source to the system and turn off the switch. If the metal detector works, you can start adhesiveing all the items on the board.
Step four. Spike schemes
Everything is collected on a piece of textolite, contacts are glued together with the help of pieces of wire. If necessary, you can make a special board for the device by etching. You can see in more detail how the diagram is assembled in the photo.
Step five. The final stage of assembly
To secure the board the author uses a piece of plywood. It should be such that it fits the Arduino controller and the circuit board. The edges need to be treated with sandpaper to make them smooth. Two-way tape can be used to glue the elements to the plywood. Also suitable glue and any other ways of fixing.
Now the coil can be painted, the author used gray paint to match the glove. Once the paint has dried, the coil is attached to the glove, for this purpose you can use hot glue. After that, you can connect the battery to 9B and enjoy the operation of the device.
As for the power of the device, the device by air can see objects at an altitude of about 15 cm, which is not bad for such a simple homemade.
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