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GB for ArDAM Lite bare PCBs
GB for ArDAM Lite bare PCBs
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Old 12th April 2017, 10:05 PM   #1
Dimdim is offline Dimdim  Greece
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Join Date: Sep 2008
Location: Athens
GB for ArDAM Lite bare PCBs
Default GB for ArDAM Lite bare PCBs

Since there appears to be at least some interest in the Soekris DAM thread in my ArDAM Lite DAM controller I've decided to go ahead and start a GB thread.

This GB is for bare PCBs that will be in this form factor:

Click the image to open in full size.

Their functionality will be:

1) To send and receive commands from the DAM through its serial port.
2) To provide galvanic isolation between the Arduino and the DAM.
3) To provide remote control functionality of volume, source and filter selection.
4) To display the relevant info on a small OLED display.

Click the image to open in full size.

Since I will be re-designing the PCB anyway I am open to feature requests, even though I should warn you that the Arduino Nano is very limited in resources and the big fonts used to display the numbers and text do not leave much room at all.

I'm considering running the GB until the end of April, at which time I'll place an order for the PCBs.

Their cost will be pretty low, very close to actual cost.

I do reserve the right to cancel the GB if interest proves to be way too low (less than 10 boards).

Edit (30/4/017): The GB has closed, I've placed the order for the PCBs.
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Last edited by Dimdim; 29th May 2017 at 08:26 AM.
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Old 12th April 2017, 10:24 PM   #2
guglielmope is offline guglielmope  Italy
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GB for ArDAM Lite bare PCBs
I'm interested.
Would be great to extend the GB also at the OLED display.
Regards
Guglielmo
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Old 12th April 2017, 10:34 PM   #3
matt_garman is offline matt_garman  United States
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Join Date: Feb 2008
Location: Chicago, Illinois, USA
GB for ArDAM Lite bare PCBs
Random feature suggestion: is it possible to have two serial port connections? For the balanced dual-mono dam1021 case, I have yet to find a convenient way to independently control to two boards via serial. I'm using Normunds' board currently, which allows you to chain the TX serial commands. So as long as you always want to send the exact same thing to both boards, it works fine. But for diagnostics, firmware upgrades, etc, it would be preferable to have independent control of both boards.

Best of course is allowing the user to select between chained and independent control.
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Old 12th April 2017, 10:52 PM   #4
Dimdim is offline Dimdim  Greece
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Join Date: Sep 2008
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GB for ArDAM Lite bare PCBs
When I started looking into doing this I tried using the software serial library but at 115Kbps it proved to be very unreliable. I suspect that at lower baud rates it might be usable. But one of the DAMs will still need to be set up to run its serial port at a low speed. It could be arranged that this be done by the controller as part of the set-up phase, but I don't know if we'll have the memory for something like that.

I'll tell you what I'll do. I'll make provisions for two isolated serial ports, the hardware based one and a software based one. Then it will be a matter of writing the proper software (a.k.a. "YMMV").
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Old 12th April 2017, 11:03 PM   #5
modmix is offline modmix  Germany
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GB for ArDAM Lite bare PCBs
Quote:
Originally Posted by guglielmope View Post
I'm interested.
Would be great to extend the GB also at the OLED display.
+1
Ulli
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Old 13th April 2017, 06:18 AM   #6
carsten.witt is offline carsten.witt  Germany
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Location: Berlin
Moin,

I'm also interested
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Old 13th April 2017, 07:21 AM   #7
Rrbs is offline Rrbs
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I am interested also .
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Old 13th April 2017, 07:25 AM   #8
Dimdim is offline Dimdim  Greece
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Join Date: Sep 2008
Location: Athens
GB for ArDAM Lite bare PCBs
guglielmope 1
modmix 1
carsten.witt 1

Total: 3
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Old 13th April 2017, 07:52 AM   #9
Dimdim is offline Dimdim  Greece
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Join Date: Sep 2008
Location: Athens
GB for ArDAM Lite bare PCBs
Quote:
Originally Posted by matt_garman View Post
Random feature suggestion: is it possible to have two serial port connections? For the balanced dual-mono dam1021 case, I have yet to find a convenient way to independently control to two boards via serial. I'm using Normunds' board currently, which allows you to chain the TX serial commands. So as long as you always want to send the exact same thing to both boards, it works fine. But for diagnostics, firmware upgrades, etc, it would be preferable to have independent control of both boards.

Best of course is allowing the user to select between chained and independent control.
It just occured to me that cases such as yours can be taken care of quite elegantly by my Universal Shield Isolator PCB and ArDAM1021 (the full version, not the Lite). The U.S.I. already supports 2 isolated hardware serial ports.

My code does not yet support a dual mono configuration (since I don't own two DAMs) but it should be pretty easy to accomodate.
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Old 13th April 2017, 12:17 PM   #10
hannesie is offline hannesie  Netherlands
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Join Date: Feb 2007
Location: Dordrecht
I am interested, and I hope that the chip is soldered.
My earlier experience was not so good with the very small size of the U1 chip.
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Last edited by hannesie; 13th April 2017 at 12:23 PM.
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