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Circuit board redesign (Read 28368 times)
Achim Berg
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Re: Circuit board redesign
Reply #15 - 04/06/10 at 13:47:39
 
Hello Steve,

here is the new board design without the fanciful ground line on the right side.

I wrote about the two capacitors C1 & C2 on the atmega 168/328. They were added in the layout too. These capacitors are not really nessesary but recommended. They make the clock of the oscillator more stabil so the Atmega IC will work better.

Now it is finished and I would like to post the reworked version ( Rev.3.2 ). The connection diagram has been reworked too, so it fits to the new layout of the circuit board Rev.3.2. ( capacitor C1 & C2 were added, D1 & D2 were shown as zener diodes with 3Volt )

Yours Achim Berg from Germany
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« Last Edit: 04/07/10 at 08:42:42 by Achim Berg »  
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Achim Berg
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Re: Circuit board redesign
Reply #16 - 04/06/10 at 13:59:17
 
Hello together,

Here is the circuit Board

Yours Achim
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« Last Edit: 04/12/10 at 08:05:12 by Achim Berg »  

OCC_board_v32_final.jpg (Attachment deleted)
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Achim Berg
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Re: Circuit board redesign
Reply #17 - 04/06/10 at 14:02:30
 
Hello together,

and here is the connection diagram too as a jpg.

Yours Achim
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« Last Edit: 04/07/10 at 08:20:15 by Achim Berg »  

OCC_circuit_new_v32_final.jpg (Attachment deleted)
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Blochi
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Re: Circuit board redesign
Reply #18 - 04/06/10 at 18:30:40
 
Awesome, thanks.

I just changed the forum settings, so it now accepts .tif files as well. And you can post up to 8 attachments at once.
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Achim Berg
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Re: Circuit board redesign
Reply #19 - 04/06/10 at 18:52:41
 
Here is the circuit board now as a tif file ( Rev 3.2 )
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« Last Edit: 04/12/10 at 07:57:38 by Achim Berg »  

OCC_board_v32_final.tif (Attachment deleted)
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Achim Berg
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Re: Circuit board redesign
Reply #20 - 04/06/10 at 18:53:36
 
and the connection diagram as tif too
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« Last Edit: 04/07/10 at 08:22:17 by Achim Berg »  

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Achim Berg
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Re: Circuit board redesign
Reply #21 - 04/08/10 at 19:04:25
 
Hello together,

yesterday i posted the circuit board Rev 3.2. Here now the updated rough scheme.

Here it is:
Purple = IC ( Atmega 168 or 328 )
Blue = NTE3041
Orange = Resistor
Red = Diode ( Zener Diode 3V )
Green = Resonator ( 16Mhz )
Yellow = 22pF/50V SMD Capacitor C1 & C2

Yours Achim
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« Last Edit: 06/21/10 at 07:53:17 by Achim Berg »  

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Steve Chapman
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Re: Circuit board redesign
Reply #22 - 04/08/10 at 21:01:34
 
All good things. Keep in mind the Arduino doesn't control the shot timing, it's there to respond to the IRQ, and press the button. Timing variations of a few milliseconds won't effect the shot, and the camera itself is a source of greater timing error, as we've seen with Canon's aperture control scheme being poorly implemented.

TBS, some future implementations of the firmware might rely more on resonator timing, and as Achim has suggested, the shot control might be handed over entirely to the microcontroller in a future rendition, so we might also consider the option of using a crystal oscillator.
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Achim Berg
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Re: Circuit board redesign
Reply #23 - 04/09/10 at 09:05:15
 
I think the option of using a crystal oscillator in not a really option. These oscilators are so cheap (less than 40Cent) an so i think it is worth to use it as a standard. Compared to the price of the controlled equipment (Camera and so on ) its nothing Smiley

I use this type of oszillator ( see picture )

By the way. At the moment im waiting for another type of optical isolator chip ( 4N28 ) instead of the NTE3041. Ill test it and will give a feedback. This IC is compatible to the pins of the NTE3041. You can by it everywhere across europe and it has the same specs. The NTE3041 is really hard to get in europe. In germany only one distributor sells it and there it is expensive.
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« Last Edit: 04/09/10 at 11:42:03 by Achim Berg »  

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Steve Chapman
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Re: Circuit board redesign
Reply #24 - 04/09/10 at 22:56:26
 
Hmmm. Hmmmmm. That picture is of a crystal oscillator, and would need the caps. The design specc'ed a ceramic oscillator. I think however that you've managed to cleverly shoehorn in a way to use either type of clock by drawing in the SMD pads.

If I understand your first line, you are really suggesting that not using a crystal oscillator is "not an option" because of their trivial cost. I'll leave it up to each of you to decide which timing source to use, but due to the apparent difficulty in harvesting the required components in the EU, I'd like to reassure everyone that the caps are not needed with a ceramic device and won't effect performance, so you do not need to find the SMD caps.
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Steve Chapman
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Re: Circuit board redesign
Reply #25 - 04/12/10 at 07:58:48
 
One thing I need to add is an LED, so that when troubleshooting one can verify that the Arduino is booted properly. It looks like pin 6 might be bridged to ground using a 3V LED without c.l. resistor.
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Achim Berg
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Re: Circuit board redesign
Reply #26 - 04/12/10 at 08:23:45
 
Hello Steve,

i can put the solderpads inside the layout to install an LED . If you want i can send you the first Version of the layout to control.

Yours Achim
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Blochi
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Re: Circuit board redesign
Reply #27 - 04/12/10 at 08:45:34
 
Send it to me, I'll put it on the page. Or attach it to a post, and it's already on the server  Smiley

Blochi@HDRLabs.com
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Achim Berg
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Re: Circuit board redesign
Reply #28 - 04/12/10 at 09:36:47
 
Hello Blochi,

here the changed layout of the circuit board Rev 3.2a with the LED pads ( pad 6 to pad 8 ) atachched to the Atmega 168/328. I named it "D3" in the layout. The corresponding connection diagram and the updated rough scheme will come soon

Yours Achim
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Blochi
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Re: Circuit board redesign
Reply #29 - 04/12/10 at 10:02:06
 
arrrr ... just had it updated with your 3.2 layout. Literally a minute ago.

PS: The years have taught me: Never put "final" in the filename. Wink
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