My New Pi Metal Detector (ATTiny 25)

[TH Jim]

Thanks for the photos of your detector Jon. I like the look of it, particularly the compact size of the circuit. Will you be able to post a schematic and source code so that we can build one too?

Thanks, Jim

[jon-ecm]

Pictures

The coils you see are not in use, just ones I tested, the one in use is attached to the window

[jon-ecm]

Mess

I guess vBulletin dosn't handle images very wheel **sigh**

You can use Ctrl - to zoom out, at least you can see them that way

I resized them, hope that helps

[jon-ecm]

Pictures!

Here are some pictures of my setup, I will try to upload a video later

Thanks!
Jon

[TH Jim]

Yes I would also be very interested to have a look at your project - it sounds marvellous!

[bernte_one]

...and the hexfile for attiny too

[Qiaozhi]

So I thought I'd build a pulse induction metal detector.
I scraped some wire from a microwave transformer and wound
about 25 turns on a 8" pan and taped it up good
I also put a 1k resistor between the two leads of the coil
for the TX I hooked up a mosfet to a ATtiny 25 which delivered a pulse about 250 us (going to be adjustable soon)
for the receiver I used another ATtiny 25 with a few diodes for protection, a variable resistor for sensitivity adj, a piezo for sound and a separate powersupply

I'm able to detect a penny at about a foot
and a lead pellet at about an inch
larger objects I can detect at several feet
It dosn't detect a cup of black sand at all but if I put a
a screw or something in the cup of black sand it detects
it like the black sand didn't exist.

Any ideas on improvement? I want to use it to find gold, right now it has less than half a dozen components and the simpler the better!

Thanks!
Jon

Would you be able to post some photos of your project, and possibly a schematic?
I'm sure many people here would be interested to see what you have achieved.

[jon-ecm]

So I thought I'd build a pulse induction metal detector.
I scraped some wire from a microwave transformer and wound
about 25 turns on a 8" pan and taped it up good
I also put a 1k resistor between the two leads of the coil
for the TX I hooked up a mosfet to a ATtiny 25 which delivered a pulse about 250 us (going to be adjustable soon)
for the receiver I used another ATtiny 25 with a few diodes for protection, a variable resistor for sensitivity adj, a piezo for sound and a separate powersupply

I'm able to detect a penny at about a foot
and a lead pellet at about an inch
larger objects I can detect at several feet
It dosn't detect a cup of black sand at all but if I put a
a screw or something in the cup of black sand it detects
it like the black sand didn't exist.

Any ideas on improvement? I want to use it to find gold, right now it has less than half a dozen components and the simpler the better!

Thanks!
Jon