chipKIT uno32 Arduino MD experiments

[greylourie]

I think Philip can attest to the QED sampling regime. Actually, I think Bugwiskers mentioned that it could be used with many of the popular P.I's found on here i.e the Hammerhead, Surf, Goldscan etc. As to the rest of the "attributes" like synchronized TX/powersupply, further digital processing for audio, low noise layout, and most importantly the TX/front end blocking and adjustable damping...these are things that are beyond the scope of the many home builders that we see here on Geotech.

Schematics give clues and examples. Software is not a requirement for people familiar with microcontrollers, they can figure out their own. Philip did.

If I had a clue about mcu programming, I would give it a bash. At the very least I would like to try the TX and sample timing control adapted onto one of the more popular platforms like the Hammerhead, Surf etc mentioned above.

Could the Hammerhead II with PIC do 4 or more samples. If it could then we have a ground balancing Hammerhead. Theres been a few people on here asking for a Hammerhead with ground balancing. Wouldn't that be neat ?

[Silver Dollar]

I'm surprised this uno32 project just died. It seems people work up to the big DSP's then they disappear.
Either it gets too hard to finish or they go commercial or something. I have a hammerhead and a 18F4550
board that I'm working towards making a HH2 but I don't understand the advanced modes well enough to
implement them myself.

If Silverdog had a QED like board available a bit more development mite occur. A sophisticated project like this
needs a well designed board to be successful.

[sled]

I'm surprised this uno32 project just died. It seems people work up to the big DSP's then they disappear.
Either it gets too hard to finish or they go commercial or something. I have a hammerhead and a 18F4550
board that I'm working towards making a HH2 but I don't understand the advanced modes well enough to
implement them myself.

If Silverdog had a QED like board available a bit more development mite occur. A sophisticated project like this
needs a well designed board to be successful.

Often the work is underestimated - a setup on the work bench is one thing but building a working assembly (housing, cabling, connectors, coil) is another story

I think it's best to start simple and get one project done from the sketch to a working product and evolve from there instead of aiming for the ultimate thing (but I have to admit that I've also stepped into this trap more than once).

There are some fine, and working projects out there but often the source code is not disclosed to the public which hinders further evolution by others.

A really fine PI project based on a PIC (with source code in C and explanations) is the PICKini ( http://users.telenet.be/willaert/MD/..._en/intro.html ). For me it was a good starting point.

I think "digitizing" the Surf PI Pro might be cool and easy project.... It's a proven design and the transmit and pre-amp circuit could easily be hooked up to a PIC/AVR. It would also cut the bill of material in half I think, allowing a even smaller form factor

[sinclairuser]

yes sled, the problem is someone takes a proven analogue design and gives it the dsp treatment, then they get dellusions of grandeur thinking they can become rich(completely forgetting the design was not theirs in the first place), or they find problems or the discrim does not work, and they get cagey and start holding out on code wanting people to buy programmed chips etc.
it happens all the time and not just in detectors.
its just one of those things, pickini is a good project, an ideal start point so are the hammerhead series, but the idea is to learn, then go away and create something new and exciting.
but this does not happen they try to work in the public domain, which is suicide.
i wish it was different, the collective minds here could build something fantastic, but there are too many agendas, too much ego, patent trolls, industry insiders looking for freebies(i dont include carl in that), for it to ever work.
so we have to make do with what we have, great reverse engineered projects, by all those contributors, fantastic kits and boards, and an excellent place to host it all(thanks carl and george).
if phillip can produce something good brilliant, if something good can come out of the qed fiasco even better, but the qed itself is gone its time has passed, somethings are best left to history, so lessons can be learned from it.

[6666]

Could the Hammerhead II with PIC do 4 or more samples. If it could then we have a ground balancing Hammerhead.

Grey do you have a block diagram of the timing that is required ?

[greylourie]

There was a marked-up pdf of the sample regime somewhere in Philips posts. That could possibly offer a set of ballpark figures to work with, perfect for experimenters and hobbyists. And it sets out quite clearly when, and to which integrator input a particular sample is taken.

Also Mickstv gives an example of his own, here : http://www.geotech1.com/forums/showt...ROL-PI-CIRCUIT

Another method that could offer something is a rehash of the goldscan timing adapted for use with only one diff integrator/channel, although would have to figure alternative widths/order if using only one differential integrator to sum 3/4 samples. Oh, a fifth sample just before TX on could be added for EF cancellation.

The point is that people who are confident around micros could add ground balance to any of the popular P.I projects - without having to morph/solder on an extra integrator circuit. And without having to access to someone elses unique hardware and software.

[ronmann]

wondering if anyone has the pde or sketch for the chance pi?