PI CHIP

[6666]

In my case it was a coles brand here in OZ used for school book covering

John what was the product called, just school book covering ?

[johnandles]

John what was the product called, just school book covering ?

Hi 6666
Can't remember the brand,Iv'e thrown the wrapper away.
It was clear vinyl,looks like contact.
The roll looks white,when unrolled it has blue squares printed on the backing paper.

@sido my printer is an old Brother,with a generic toner cartridge.
The boards turn out very usable. As pete stated,the boards have to be cleaner than a nuns...
I've made 4 boards for the Pickini project,I will post some picks when I recharge my camera.
Cheers
John

[johnandles]

A little pitted but usable.
Still learning
Regards
John

[Carl-NC]

For anyone interested, the trick with PnP is temperature - and über-clean boards.

When I say 'clean', I mean "water runs off it like a duck's donger" clean. You scrub the copper with plain steel wool and soap. Don't bother with sprays or chemical cleaners. When you've finished, the board will shine so clearly that any dirty spots or grease from a finger stands out like dog's balls. You drop some water on it and it stays in a drop - it doesn't wet the surface.

Yep, and then you clean it some more! Once clean, I'm very careful not to touch the surface and contaminate it with oily fingerprints. Done right, the results are impressive. Done wrong, it's a sad mess (done that, too).

[Pete the Builder]

A little pitted but usable.
Still learning
Regards
John

They are boards you can be proud of, mate. Better than my first tries, back in the day, using Bishop Graphics and Dalton tape. And liquid rubber for the big areas.

I've found that a quick, hot etch generally (but not always) stops the pitting from happening.

You should be able to warm pretty much any etching solution and get much faster results.

I found that using ammonium persulphate (you can buy it from Jaycar relatively cheaply, in a plastic can) at 51 degrees C (which is as hot as my fishtank heater goes ) will etch a half-ounce copper board (any size) in about 2 minutes. I'm not kidding, it blew my mind. After wasting god knows how many hours sloshing around ferrick f****ing chloride in little plastic luncboxes... I swear, I nearly cried when I saw what warm persulphate could do... And it's cheaper than FeSO4 too!

If you haven't tried ammonium persulphate, you have to get some and try it. Man it's good.

Anyway... Those are really solid etches, John. You've got good edges, pretty good pad holes, nice wide IC pads, no "beaches" between tracks... Great result!

[johnandles]

Thanks Pete,I haven't tried the ammonium Persulphate.
I used hydrochloric acid (from bunnings) and hydrogen peroxide (supermarket).
1:2 ratio
Never tried heating it up.
Thanks for the tip.
John

[sido]

[ATTACH]23838[/ATTACH][ATTACH]23839[/ATTACH]

A little pitted but usable.
Still learning
Regards
John

Hi John, Great boards and unique way of producing them.

Have the idea now, how you go about making these boards and will give them a try.

Pete, Carl and the rest are correct, that the boards should be as clean as a ...... ............ .............. ........ .... ...........
to work

John....just wanting to know if the boards can be made with your method with low tolerance spacing between tracks??......without pitting.

Have you acheived this previously with this method??

Cheers Sid

[sido]

OKay...Lets get back to the serious topic of a UNIPI!!!

Trying to layout the Ultimate UNIPI format......................

I appreciate the Moodz UNIPI V300 posted by the main man Paul. Much effort for little return from most and some questions should be adressed though, for improvement.

I have a question though for you Moodz in general.......Please dont hang me dry people........As i thought this well and is relevant to the improvement of the UNIPI for experimenters....

The UNIPI uC controlled PI is good in it's own right.....BUT..................................... ......

Can multiple TX Pulses be implemented in the TX train....where user can adjust the (parameters) timings to suit????

Example:..........Can we be able to produce the Complex TX waveform of the well known and reliable M.L waveform (SD2000) example.......

This would aid the experimenter in trying different TX Complex Timings....USER ADJUSTABLE and further Sample channnels may be used as noted to further aid the experimenter.

Basically....Moodz......IS it possible for you to generate a new code for say the PWM (1) (one of the PWM outputs) to be used as a user adjustable parameter (In Code) with a complex TX Waveform during the TX pulse...... the different TX logic parameter's if can be done...... can be user adjustable if possible to the available Chip contraints??...........Generating over say a period of 500us and repeated 3 different continiously TX pulses through the possible modified software code but user adjustable and repeated over that period of time (500us).

Similar code to the TX Train of the SD2000...but user adjustable??

Why i say this is important...... is that to experiment with complex waveforms to perform reasonably Ground Balance and elimination or experimental Waveforms relevevant in Time Domain.....then we need a code that can be able to implement a complex TX waveform where we can sample (user adjustable) as required as usual with the code already provided by yourself Moodz....but to be a user TX on Complex and adjustable TX width parameter to aid in experimenting with new GB Systems.

I love the simple UNIPI code for repetative uniform UNI PI TX Pulses.....but for complex TX parameters, these are not so good for unique and Experimental NEW GB systems if user requires them through code modification.

Just a thought there Paul.....if it can be done their through your expertize,.......... without major Modificaction to the original code (V3.00) or IC pin locations.... ....then that is a improvement in the UNIPI as a experiemental platform as a whole and will benefit most for future experiments....either utizing Differential or mono Frontends which can be used and whatever backends audios are implemented..........will aid the experimenter 10nt fold

Cheers Sid

[johnandles]

John....just wanting to know if the boards can be made with your method with low tolerance spacing between tracks??......without pitting.

Have you acheived this previously with this method??

Cheers Sid

No Sid, haven't tried different spacings as the boards I made where found on this site as established projects.
Either Eagle.brd or PDF,etc
Cheers

[moodz]

Thanks Sido ... question .... what interpulse tx timing max period would you like on multipulse TX ? Darn ... I should have read closer .... the SD2000 timings.

[sido]

Thanks Sido ... question .... what interpulse tx timing max period would you like on multipulse TX ? Darn ... I should have read closer .... the SD2000 timings.

Hi Moodz, I gather i may have not phrazed it clear

What i am trying to say is that the current adjustable TX Pulse output's of UNIPI V300 can only produce a single pulse at a user selectable time (A one shot pulse of user adjustable variable width)

If it is possible, keeping the current pulse outputs setup as they are........BUT include another menu where user can select and adjust multiple complex pulses over any given time (All user adjustable).

SD2000 timings is an example of what i mean by being user adjustable.........where all the timings in that time period (1440usec in this example).........if possible can it be user adjustable as a new menu option with the existing current one.

Say i want to create a 2000usec TX Pulse Train, but say i want s1 (SEE SD2000 timing example below) to start off with 300usec TXon instead of 240usec, then followed by 300usec TXoff, then followed by 100usec TXon 100usec off etc etc etc (new timings).......This all being a user adjustable format by a new menu added and obviously some new hardcore code, providing their is no limitations to implement this in the current hardware used. (dispic4011)

Actually you wont need the current generic code for the 7 Pulsed outputs if the above can be done because if a user wants a single output pulse at any given time, this can be done so because it is all user adjustable.......and if user wants to implement a complex pulse, again its user adjustable for any give length of time.

Basically you go to menu, select s1, then enter say your first on/off pulse, then second on/off pulse, then third on/off pulse etc etc etc....where each pulse width is use adjustable also....Then when satisfied with the pulse timings you save it and the program continiously loops that new user adjusted Pulse train.

To sum it up, its modifying the 7 pulsed output program codes to allow more complex user adjustable pulses of varying degree.

I hope i explained it a little better now

Hopefully if it can be done without taking up to much of your time.
Much appreciated

Cheers Sid

[IBGold]

Hi Moodz,

While waiting for the UNO32 information I reverted back to the UNI-PI to do some testing with the RX now the TX bugs are worked out I programmed the TX for an on time of 80us and an off time of 12us which was fine then I set S1 to 85us on 90us off and S2 at167us on and 172 off while looking at the outputs on the CRO TX is fine but S1 shows just before TX switch off instead of starting at 85us and I get no S2 I take it that all the timing settings should be from TX switch on, If I advance the S1 switch on and off times to try and get it in the off time I get to 92us on and any semblance of S1 disappears any ideas.

Regards, Ian.

[moodz]

It could be a bug but more likely the original code was never designed to handle very short times ... More conventional timings like 100 us on and 400 off etc. there is prob a race condition in an interrupt handler.

[moodz]

So you just want an arbitrary pulse sequence to be fired to then repeat. No real prob with that. I'd rather use an FPGA to do this ... Actually I did use one ..but that's another story. So the short answer is yes ... We can do that ...just need to pull the finger out and code it up.

[IBGold]

You are over my head I no understand ring me when you get time.

Regards, Ian.