AVR+DSS Frequency Mod SD2100V2

[IBGold]

Hi Mario,

That was just a bit of wishful thinking of mine with the VCO I have I find the higher frequencies quieter and with the VCO you can very slowly go through and find the most stable and quiet frequencies in any range the only problem is its jitter, I search with both channels except with the 6 MHz crystal I realise we are locked in to the pulse train we have, but frequency changing seems to work well also my sample windows open a little earlier than normal but overall I am very happy with how it performs it is a combination of many different peoples ideas and mods but the most important has been Zed's input and help and of course Stefan's help.

Regards, Ian.

[mario]

Software done

I have completed the software (soon to be posted) and have resolved the last remaining issues.

You may watch the video here: http://www.youtube.com/watch?v=8UnrnvRAb68

I decided to cut the little board, and incorporate the controller module inside my power unit. I found enough clearance to fit the little board entirely inside the case, but decided to subdivide the dss module and main controller. I could not find enough room for the LCD, pot, and encoder in addition to the stock pots and selection switches.

I really like this mod since it allows me to use the stock ground balancing pots and switches. Though they now feel redundant, I did find myself using them alongside the encoder for fine tuning the frequency at the lower settings.

I know this mod is more of a sophisticated frequency hack. A more refined approach would have been to replace the whole oscillator/eprom/ transmit circuitry with micro generated signals, like some of you have done, but it is what it is...

Maybe after attaining a deeper understanding of the signal train could I then try to emulate it. If any one has a solid understanding of the signal and would care to explain it, please do drop me a message. Or If any one has a link to a good article or discussion on the issue, please do email me also. I envision the day some one will digitize the signal and process its characteristics via a super fast 32bit micro, assuming none of you have attempted it yet.

Anyway, one last addition to the mod I will eventually include (later rather than sooner) has to do with the eeprom. That eeprom just begs to be re-written to. The Atmega328 has a 1k eeprom so I could theoretically fit the entire system timings inside it (the contents of the 27C256 eprom don't exceed 1k). In fact, the stock timings currently expressed don't even exceed 256 bytes (don't forget about the 3 hidden timings -it's these 3 hidden timings that bring up the eprom size to 1k!); therefore, I might simply end up re-writing the program to include support for flashing this 27C256 with the contents saved to our Atmega328.

Imagine wanting to experiment with your own hand-made timings. If I include this mod, you would, simply, flash your Atmega with your experimental timings along side the stock timings. Then, when you're ready to experiment, you would flash your detector with your saved timings. And If anything went wrong, you would revert your timings back to stock-no harm done.

The eeprom mod is a perfect compliment to the frequency mod! All we need is 3 extra pins from our current setup and separate grnd/vcc rails. Here is great potential for further enhancing our detectors.


One last thing I will mention, I need some rest, so forgive me for disappearing for the next week or so....I've been working on this and need to stop. In addition to my regular job, I'm really really exhausted. To all of you that have posted and have shown interest in the boards, I have reserved them for you. I will just need the types of configurations you desire (board-only or board+component combos). I will only sell the AD9851 chips to those who can not find suppliers -they're really pricey, digikey's selling them at $29US!

To everyone else who's interested, email me to reserve a board. I only have a selected remainder so some of you might not get them...I might order another print run if there's enough interest, but unlikely...

just please give me some time to take a brake...

thank you for understanding


Note: I screwed the dss sub module to the daughter pcb and will include the controller inside my power supply.

[Jiminy]

Mario, GREAT work!
I would still like two of your blank boards when you're ready.
I shop at Digikey, Mouser, etal so I know where to find the parts.
Thanks again for the good work. Will be interested in the timings for the
27c256 also; I have a couple blanks. I can burn them in addition to the ATMEGA chip you used with the mod.
/r
Jonn

[mario]

Hi jiminy,


I would leave that eprom untouched. Removing it may be tricky, and if removed incorrectly, removing it may damage one of the surface contacts.

Considering that no other binaries have been made public, there is no point replacing it.

[Jiminy]

Thanks, Mario.
I liked your idea of putting it in a socket. More flexible when the time comes.
Something else to add to the "to-do" list for later.
/r
Jonn

[mario]

Software updated 1.3.2

In Windows, run "notepad" utility and paste the below code. Then save your file as "AVR-DSS-1_3_2.hex" and flash your uC.

Before flashing, change fuse bit settings to: Low:77 High1 Extended:FF

In future versions, I will provide support for:

1) A preset selection of 5-10 frequencies. I don't think loading of pre-saved frequencies is necessary because even though user-found "quiet" frequencies exist, these saved frequencies still depend on the position of the ground balancing and tune knobs. In other words, you have to maintain an identical position of all 3 knobs across the whole range of your saved frequencies for this option to be useful. If you move your knobs, which will eventually happen, all your quiet frequencies become "non-quiet." Notice that most frequencies become more quiet if you use the "Tune" and ground balancing pots correctly. A more appropriate labeling of presets should include their relation to system timings: For example, "Preset 1: 30uS", "Preset 2: 20uS", "Preset 3: 10uS", etc. However, I might end up providing support for pre-selected timings in addition to user saved frequencies.

2) Eeprom write support. This feature will not be compatible with SD2000s since they lack eeproms. However, the more I experiment with system timings, the more necessary it has become to be able to load custom settings. As some of you have discovered, the key to taming the threshold lays in the signal pattern. I have not done much research on this, but this issue needs to be implemented. Fortunately, our trusty Atmega328 has just enough pins for this feature.

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[mario]

Put in another 3 hours

Everything still stable, the mod keeps going strong.

No sparks or smoke !

My offer still remains: A FULL non-assembled AVR-DSS kit for a working "DD" coil. I don't care if you build it. I just don't want to take time to build my own.



*Lipo kit or audio amp not included

[mario]

images

This completes work on this project guys. I'm really proud of this software release. After several hours of field tests, I can attest to it's usability.

Update includes:
-Save/Load frequencies
-Decreased battery consumption (by a lot!)
-Defaults now to SD2000 (toggle pin 27 to get SD2100 Mode)
-No modifications needed to hardware.
-Program is very stable.
-Make sure to program the fuses with the following: Low:62 High1 Extended:FF

Also, I did mention my intentions about programming the SD2100's eeprom. However, it seems like I was wrong about the pins required. I need far more pins than the Atmega328 can provide. Indeed, even with the 64 pins of the Atmega128, it is barely enough to do something useful. Having said that, I'm working on interfacing with this eeprom. I'll keep you updated.

Last thing I would like to mention: I took Ian's offer on the coil, So no more trades.





CODE SAVE as "AVR-DSS-2.hex" and enjoy!!

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[IBGold]

Hi all,

Well I have got Mario's module up and running on my SD2000M after sorting out a few bugs mainly self induced although is is running early software it is truly impressive I will now go and do the tests Mario requires so he can optimise the upgraded software for the 2000 I can not wait to try it in ernest here is a picture of the module mounted on my 2000.

Regards, Ian.

[mario]

Hi Ian,

Nice work on the case, where did you get it done?

Also, I never did ask, but how did you interface with the detector? Did you end up removing the Crystal selection mod? Did it work with the 100pF cap? or did you install the other test caps?

I'm glad to see the mod up an running on the SD2000. That model just keeps getting stronger as the years pass.

[IBGold]

Hi Mario,

The case is homemade out of the same 1mm ABS as I make coil housings from but fabricated not vacuum formed and yes it is fed through the 100 pf cap into the detector in lieu of the crystals I can either switch the crystals in or your unit in .

Regards, Ian.

[Jiminy]

Ian,
Do you make DD coils for the 2000? I talked to Stefan awhile ago. He gave me some pointers for wire. I read all the posts about his coils and shielding and have compiled them into a word document for reference.

I have all the parts for Mario's Freq mod, however mouser was out of the 15 caps there required. Still waiting on them. Had problems getting the 100mhz crystal too, finally got that with Mario's assistance. How did you run the connections out of the control box?

I still have not found adequate time to troubleshoot the SD2000. Something always comes up to take away any spare time. I'm at work at 6:15am and home about 6pm at night. Not much of a life. . . . . and. . . . in process of changing jobs to boot. . . .
/r
jonn

[mario]

So, Jonn, with that busy schedule, how do you find time for anything? The only thing I would have time for would be sleeping.

Anyway, it wasn't until after I had completed the software that I realized the stock issues with those rare 100Mhz oscillators. I tried different suppliers and only mouser carries them.

However, the project should work with the more common VCOs, so it shouldn't be much of an issue.

If Mouser or Digikey doesn't carry a particular part number, simply look for a replacement by using their filter feature. Narrow down the options to a 1206 package. The 15 pF caps are very common. Were you able to get all the parts?

Also, it sounds like Ian has the board connected to his detector just like mine.

[IBGold]

Hi Jonn,

Yes I have made a few DD's for my own use there are pictures somewhere here on Geotech of them going back a while but not of the latest ones of the last 12 months I know all about that sort of work schedule I was a 5.30 am to 6.30 pm man until I retired.

Mario I have fed the unit in at the crystal selection jumpers Jonn will understand where that is.

I still have not done the tests as the 2000 is on the bench waiting for Stefan to give me some information on something he sent me to add in while I had it open but should have that complete in a day or two and will be able to get down to business.

Regards, Ian.

[Jiminy]

Mario, thanks for the info. I believe I now have all the parts on order finally. Yes, you pretty much have my schedule down.

Ian, we plan to retire the end of next year. Already have a retirement home in North Carolina on the 4th tee of a golf course. Was there last weekend again. Have to talk to you offline about the DD coils.
/r
jonn