Clone PI (AVR) Help!

[tresoro]

I did solder a Clone PI (AVR-ATMega8 ) but it still does not work yet.
When I switch on following appears:
"Clone PI ver. 1.8.1 (AVR)"
then
"Tune"
then
"80"
"Guard Interval
81"
then I hear three Beeps of rising frequency (first a low frequency sound, then middle and last high sound)
Then it keeps on displaying the bar left and displays below:
|
"B4 V5 ><11,7V "
At pin 8 of the TL074 I measure 2,7V which I can not change with the 1k Potentiometer.
How must it be tuned?
Are there any (software?-)operational manuals in english, german french, or spanish?
What do T1, T2 and T3 switch with the 4066 in what time sequences (I only have oscilloscope for 1 Channel and see the following (The T0-Pulse is correctly switched to the coil by the way):


Can anyone asign the time withs of the Diagrams above into the timing diagram below?

So please can anyone tell me how to understand the function of T1...T3-switches and try to find the mistake to make it work?

[tresoro]

The first Diagram disappeared at ImageShack; here again:

[1843]

Tresoro,

T1 does nothing, only changes the gain of preamp. T2 is sampling pulse and T3 resets the integrator.
You should adjust the pot(R7) to get a flat line at the pin7 of U5B.

Regards

[tresoro]

I always measure 2,7V at at the output of U5C independent of R7-position , so may be there is a Mistake in my itegrator-circuit.
I will buy some other TL074 and 4066 next week and try them.

Meanwhile I will look in the web, whether there is any freeware-logic-analysator for LPT1 to take a recording of the exact timings of T0...T3 (and may be for writing some own discriminator-software one day as I can not find the C-Source for AVR-clone pi in the net)...

[tresoro]

Who knows the correct voltages ?

The +Up was not there at IC5 (Pin4) and now I have 6V at the moment of switching on at pin 8 of U5C, what I can tune from 6 to 7 V with R8 .
The voltage is rising after the first minute up to nearly 9V (with any raising internal temperatures as it seems).

I still do not know what T1...T3 do and what the correct voltages have to be (and what to tune with R8 ) (at Pin 23 U_ADC I have 1,4V and still no correct operation).

Can anyone who did build the PCB write some correct voltages into the sheme and post it here or send it to me by PM ?

[1843]

Tresoro,

Build a pcb like this:

I have made this that works OK.

Regards

[tresoro]

Nice PCB

Nice PCB you did (is it from you yourself by the way?) !
Looks much better than my version :

But could you load it up without the disturbing part list (one else would have to edit by paint program before using it) ?

I thought that I only had a SMD-PCB here:

But then I found a former wired version on my HD here:

But no time and equipment to make those PCB’s now (want to try to make my old home-wired version run first...).

Anyway a software description or manual in English would be good as for example I do not find the discriminator display in the menu (or does discrimination not exist in the AVR-version!???) .
My version (only?) shows:

The PIC-Version offers the discriminator-screen, so does the AVR-Version not discriminate? :

Would be glad, if you or anyone could measure (one day?...) the tuned voltage at Pin8 or 7 of IC 5 so that I know, what I have to tune.

(and I also would like to hear some experience reports about the discrimination quality of the clone PI in relation to the
PD3200 or Miner2...4 or Goldscan IV(if last works as discriminating PI; don’t know exactly) or other known discriminating PI’s with published hard- and software)

[1843]

I searched my pc, don't found the .lay pcb file... Only there's the gif file which is posted here.
The AVR version do not have disc. It works like Hammerhead but with a poor sensivity. GS-4 really is a good PI, Excellent sensivity and GB.

Regards

[1843]

I think that your wired pcb Clone will detect a 1m x 1m metal sheet at 1cm! :-)

[tresoro]

too slowly and only ferrous ...

Well, not that bad... (meanwhile it "works" after soldering a missing wire)

But it is extremely (!!!!) slowly-acting (intolerable slow software) and working only on ferrous materials and so has no discrimination function as it even does not see copper

Do not yet know what Barrier number to take and to which level to tune R7 (use 4,9V at U5C.8 in the moment).

May be I have the wrong Software (1.81) or have to build an adapter for 16F873A+MCP3201+Xtal and try some discriminating PIC-Software (which one would do so best ?)....

[tresoro]

no Discrmination

Did read not till now your pre-last posting that the AVR makes no Diskrimination

As I made an analog NE555-PI years ago, that is ultra-sensible, my Problem is not to receive a sensitive PI but I need excellent discriminator-function.

Till now, I thought disc. was impossible for PI until I saw the display pictures of clone PI above and wanted to test, if there really is a PI that does not show at all ferrous material.

That’s because we have tons of ferrous material here in west germany and I would have to dig all the places all 0,3 m distance here to se indicated materials.

So there would be no detecting possible here, as there is to much ferrous material here unless I have a sensitive detector, that only indicates non- ferrous material.

Later then I will try some PIC-Soft and then may be finally build the miner4 one day...

[jason]

What is a Miner2...4 Pi?

regards jason

[1843]

Tresoro,
I guess you have set the fuse bits wrong. My Clone PI is not slow and can detect a gold ring at 15-18cm.

jason,
Miners are from German site: Pulsdetektor.de

Regards

[jason]

Thank you 1843,

i could not find Miner4 on their web site.

Anybody out there who tried their products?

jason

[mehdi]

Tresoro,

Build a pcb like this: [ATTACH]4151[/ATTACH]

I have made this that works OK.

Regards

Hi
what is the detection depth?