For some of [mircemk]'s other metal detectors, be sure to check out this one which uses a smartphone to help in the metal detection process.
from Google Alert - metal detecting great finds https://www.google.com/url?rct=j&sa=t&url=https://hackaday.com/2021/08/12/arduino-finds-treasure/&ct=ga&cd=CAIyHGQxYTc0ZWJmMDQxMjk0NzA6Y29tOmVuOlVTOkw&usg=AFQjCNGx8G_gHWrJOv-aYcFA1-mUGrh2SQ
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