DIY Sensitive Arduino IB METAL DETECTOR (coin from 25cm big object at 100+ cm)

This article is sponsored by PCBWAY https://www.pcbway.com/
A metal detector is an instrument that detects the presence of metal nearby. This time I will show you how to make a very sensitive but simple to build "Inductoion Balance" type of metal detector made with the help of Arduino microcontroller and several other components. The construction is really simple thanks to the microcontroller, but also the module for weak signal amplification with LM358 IC which can be ordered for less than fifty cents. However for those who can not obtain this module, I also presented a schematic diagram in which the amplification is done with two standard NPN transistors, with the sensitivity of the device being the same as in the previous case.
And now a few words about the coils. They consist of 60 turns of 0,4mm^2 (32 s.w.g.) enamelled copper wire coiled in a circle with a diameter of 15 cm.
As you can see in the video, this detector can detect a small coin at a distance of 20 cm or more, a hard disk drive at a distance of 40 cm, and a large metal object at a distance of more than 80 cm in the air.
The ability to locate objects buried in the soil are, of course, dependent on soil conditions. Dry sand being the most favourable, and clay is the worst medium.

Detailed instructions, schematic, and code at :
https://www.hackster.io/mircemk/diy-s...

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If you are interested in this area, see the Playlist with all my Metal Detectors at:
   • Homemade sensitive Metal Detectors  
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Visit my Youtube Channel for more Projects , DIY and How To Make videos:
   / mirkopavleskimk  

by mircemk
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