Universal PI Micro

[1843]

Hi bugwhiskers,

Where is the UPIM full schematic ?(with component list)

Best regards,
1843

[bugwhiskers]

BOM and Schematic in PDF format

Hi 1843,

Attached are files as requested.

regards
bugwhiskers

[1843]

Thanks a lot!

[1843]

Please send the DISCRIMINATOR schematic with its component list.

Regards,
1843

[bugwhiskers]

Hi 1843,

Please read post #202.


regards
bugwhiskers

[Oscar]

Hi Bugwhisker,

Can you lease publish all hardware and software materials in one place as there are all scattered around?

regards,

Oscar

[bugwhiskers]

Putting it all together.

Hi Oscar,

The most up to date info is as follows.

post #225 Eagle format schematic and pcb
post #234 .PDF of schematic and pcb
post #256 Firmware
post #260 Rotary Encoder info
post #262 BOM in text format

regards
bugwhiskers

[1843]

Discrim sch

Hi 1843,

Please read post #202.


regards
bugwhiskers

Thanks!

Now the next step is to program an ATmega8 for this PI! I will be doing it when I get free time.

Best regards,
1843

[bugwhiskers]

Hi 1843,

The UPIM is a platform containing all the essential components for a PI detector. It can take 8 samples of any part of the decay waveform. It is left up to the user to make simple circuitry on an extender board to do other things like discriminate, ground balance, further amplification etc. There are many posts and some circuits on how the discrimination works based on the conductivity of the target.

I have been using the UPIM for the last few months doing some experiments with my own extender board.

Here are the results:
Coil: Round 10 inch 300uH
Total amplifier gain: 100,000
Target: Aluminium block (6060-T5) 100mm*50mm*10mm
Discrimination: Full Ferrous/Non-ferrous
Signal at 27 inches = 0.1v (100mV)

The method used above is not a "normal" PI which shows just how versatile the UPIM is in allowing the user to do their own thing.


regards
bugwhiskers

[Oscar]

Bugwhiskers,

Thanks for update!

Lets hope we get the support of all people interested in this project. I will try to do some research on your project as it is very educational and interesting. Now that I have obtained all available books about AVR programming both in assembly or C languages and also many references in hardware digital design. But I need to refresh my assembly language skills first before I can be any real assistance.

I also hope people interested in this project, get somehow involved and contribute depending on their capabilities. I do understand not all of us have electronics engineering backgrounds but being an open-source project, it is good opportunity for everyone to participate thanks to BW. I have been personally working full-time and studying part-time for last 5 years but I will try to find time for this project and do some experimentations.

I also like Hammerhead project as it is very modular design and educational.

Thanks everybody,

Oscar

[1843]

Hi bugwhiskers,

I think that for proper discrimination by this PI we need to a fast coil and low pulse width about 50-75us to allowing a fast decay.
Sample1 should be taken about 8us or less for disc between metals and sample2 should be taken at about 30us for the response range.
I don't have any idea for ground balance. What idea do you have for it?

Regards!

[Atul Asthana]

Complete documentation of UPIM required

Everyone involved in UPIM design and improvements has done tremendous amount of hard (and intelligent) efforts. And we need to thank all those involved.

However, the efforts' knowledge is distributed in many mails and drawings. This makes it difficult for any one to understand the entire UPIM.

I'll request if the knowledge could be put together in form of a document (please do not use docx[MS OOXML], which most of the people will not be able to open), it'll help a large number of people.

And, I'll be further grateful if the theory of operations (specially, discrimination) could be included.

[bugwhiskers]

Hi Atul Asthana,

Ignore all the posts prior to the introduction of the Evaluation Board.

The discrimination method has been well documented in a number of posts but I will reiterate.

The decay curve shape is influenced by the conductivity of the target with better conductors producing a flatter curve and worse conductors a steeper curve. If 2 samples are taken to look at the shape of the curve (it's flatness) then the user has an indication of the conductivity and therefore the metal type with Silver producing the flattest and Steel much steeper.
Orientation of the target will have some effect but not to the extent of Steel looking the same as Aluminium.

regards
bugwhiskers

[Unregistered]

Hello Bugwhiskers ,
For discriminate, did you test in soil , did you have some difference with air test because of the complex electromagnetic pattern generate by the coil in soil ,
can you tell us your experience in Australian field where mineralization is hard
we will apreciate very much your conclusion and this will stimulate the purchase of the evaluation board for us in Mexico,Thank you BW
Saludos from Mexico
Alexis

[bugwhiskers]

HI Alexis,

The method has been shown to work both in air tests and with a target covered by undisturbed ground (lateral hole in bank of a creek).

The method could be applied to any PI that can take 2 samples in the knee of the curve, not just the evaluation board.

If you take the 2 samples and adjust their widths so the earlier sample is equal in amplitude to the later sample then a flatter decay curve (eg from Silver) will cause the later sample amplitude to be larger than the earlier sample. Optimisation of the above principle will be achieved through experimentation with different sampling positions to find the "sweet spot".

regards
bugwhiskers