Then searched web for DIY metal detectors. And of course found out that cheap ones are probably crap and better ones I can´t afford. Then I researched market for metal detectors. So logical step was to get a metal detector. Motivation to that came from repeatedly sawing into hidden metal inside wood with my chainsaw mill, and ruining my saw chain. One day I decided that I need a metal detector.
I've found that 470μH and 1,8A 0,28Ω rating works fine. Coil resistance in the range of 0,25 to 2 ohms.įor pinpointer it is preferred to use off the shelf ferrite core inductor for the coil. Possibly the reasonable range is 150μH to 470μH. You can use variety of coils with different inductances. There are many good coil making instructions in the internet.Ĭoil inductance in the circuit is given as a guide only. Regular 0,5mm or less diameter insulated solid copper coil wire is also good. Software algorithm automatically adapts to the coil parameters.īasic coil is 20cm diameter, and 27 turns of 0,74mm 2 copper electrical installation wire. This circuit has been tested to work with different coils. Quick link to the PIC12F1840 datasheet: 41441B.pdfįirmware source code version 1.80: firmware180.zip HEX file for PIC: metaldetector_hex.zip Kicad project files (circuit and PCB Ver3.00): Kicad_project_files.Black and white version of the schematic (better for printing): metaldetector_bw.pdf.
#DIY PINPOINT METAL DETECTOR PDF#
Schematic pdf file here: metaldetector.pdf.Reason I publish all details is that I want others also benefit from the hard work I have already done. I keep pursuing my original goal, to keep the schematic as simple as possible with as few components as possible, yet to have good sensitivity. In circuit programming (ICSP) connector for easy firmware uploading.
Gold makes slightly different sound from iron. Non-ferrous result in lower tone than ferrous metals. Discrimination between different metals.Moving mode detecting, search algorithm automatically adapts to the coil parameters and detects as those change in time.Just use standard inductor or wind some turns of wire yourself and start detecting. Search coil is simple monocoil with no adjustment needed.
#DIY PINPOINT METAL DETECTOR FULL SIZE#
It is possible to make either pinpointer or a full size metal detector based on this circuit. DIY Metal detector project with PIC12F1572 (or PIC12F1840) microcontroller.
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