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Offline Homefire
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« Reply #30 on: December 18, 2012, 10:20:44 am »
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Cool little thing.   Huh?

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Offline TeemoTopic starter
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Self design PO detector
« Reply #31 on: December 18, 2012, 03:03:11 pm »
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Hallo everybody!

Thank you again, who have posted replays in this thread already. It has been nice conversation.
Have some good news for you. I have released the assembler source code.

I encourage you to share your modification, and test results, in case you decide to build this project.

Here is the link to my firmware page, there is also basic flow diagram:

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firmware-page

Direct link to assembler file:

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metaldetector100.asm


I also add zipped asm file here as attachment.

Best wishes,
Teemo

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metaldetector100_asm.zip

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Offline xavier
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« Reply #32 on: December 18, 2012, 03:18:38 pm »
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Quote:Posted by only_25
the board would fit perfectly for a pinpointer!

But it would not work well if you are using a VLF detector what I mean is, every time that you will want to use your pin-pointer you will have to turn the VLF detector off. I know because I build one not too long ago. 

Hi Teemo

Thanks for the code, will get on it as soon as I can

All the best to all
Xavier

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Offline GoldDigger1950
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« Reply #33 on: December 19, 2012, 06:55:51 am »
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Quote:Posted by Teemo
I also add zipped asm file here as attachment.

Thanks for the source code, Teemo. This is equally as important as the hardware design. Not only that, but, some of the more clever folks here may make your device better by tweaking the code with their own adaptations.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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« Reply #34 on: December 19, 2012, 04:21:02 pm »
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Hi Teemo

I did build a pin-pointer some time ago for a mate using a PIC (16f690), a few external components, a ferrite rod and I think 70 turns of 0.5mm wire (magnet wire) the depth was around 120mm for a 303 cartridge but he did locate a silver coin at 70mm. What has turned me off this design was the interference that we were getting in the VLF machine there was even an interference in my PI machine. What I did was to have all the timing on ADC so that I could change the timing according to the coil that I had (Based on previous experience)  By doing it this way I could fine tune it all and then ended up with a pin-pointer of reasonable ground penetration. The pin-pointer worked rather well as the field is well directed by the ferrite rod being surrounded by the coil but like I said before the interference (Possibly I could have done some good shielding) made it a pain in the butt  Grin I will try to find the schematics and source code for it as it was on my old PC (I still have it and love it) I do not have it with me, I use it in my lab to do all sorts of nutty things that I would not try with this one.             

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« Reply #35 on: December 19, 2012, 04:37:35 pm »
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Quote:Posted by xavier
What has turned me off this design was the interference that we were getting in the VLF machine there was even an interference in my PI machine.

Did you try to shield your pinpointer? In any PIC circuit, there are a lot of clocking pulses running around. All unused pins need to be grounded through a 33k resistor and programmed to be low, for starters. Each of those little legs will become an antenna otherwise.

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« Reply #36 on: December 19, 2012, 05:09:49 pm »
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Lets see if I remember this Right.

Square Waves are Made up of a Infinite Number of Odd Harmonics.

Square waves produce by Digital Circuits can be detected all over the RF Spectrum.



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« Reply #37 on: December 20, 2012, 12:37:40 pm »
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Quote:Posted by GoldDigger1950
Did you try to shield your pinpointer?

No I did not at the time but I was thinking about it last night funny enough.
 
Quote:Posted by GoldDigger1950
In any PIC circuit, there are a lot of clocking pulses running around. All unused pins need to be grounded through a 33k resistor and programmed to be low, for starters. Each of those little legs will become an antenna otherwise

This is good to know. I did not set them to low and I did not have them to ground either (thanks for the tip) 


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« Reply #38 on: December 20, 2012, 12:39:37 pm »
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Quote:Posted by xavier
I was thinking about it last night funny enough.

I once managed a mailing list named GMTA which stands for Great Minds Think Alike. That was many, many years ago.

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« Reply #39 on: December 20, 2012, 01:54:01 pm »
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Fire it back up GD!

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