Author Topic: Interest Thread for Octoscroller boards  (Read 14302 times)

Offline CaptainMurdoch

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Re: Interest Thread for Octoscroller boards
« Reply #15 on: July 22, 2015, 08:41:56 PM »
Something I mentioned to David last week was the idea of a possible modified Octoscroller which included a RTC.  I think there might be room on the board by extending the board to wrap around the Ethernet port a little.  That would allow the Octoscroller and BBB to be used in more standalone applications.  The RTC parts could be optional.  I don't know if there is a need for that though.
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Chris

Online JonB256

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Re: Interest Thread for Octoscroller boards
« Reply #16 on: July 22, 2015, 08:46:27 PM »

that said, I'm tempted to have john do my soldering... :)

I use very thin gauge, 0.020,  63/37 solder for all my boards, plus a narrow chisel tip.
I tend to run the temp on the high side. My results are consistently good.
Plenty of light and a lighted magnifying glass are great.

I have soldered 11 of the Octoscrollers now. 2 were from Dave's "Black Board" run and 9 of the Purple boards from OSH Park

Offline AAH

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Re: Interest Thread for Octoscroller boards
« Reply #17 on: July 22, 2015, 08:59:11 PM »
That's not a bad call on the RTC Chris. Had I thought about it I would have added it to my revised board. I've passed you with the number of boards Jon. I'm now at 17 boards. I also run my iron hotter than most as I like to get in and out quick (400C, 750F). All the ones I built were in Aussie that DarylC organised.

For anyone having issues with failures the first places I would look are the close vias in and around JP1, JP2, JP4 and JP5. As the picture below shows there are some tight clearances. I imagine that all boards that got made had bare board testing done so in theory there shouldn't be any shorts between the vias.


Offline Steve Gase

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Re: Interest Thread for Octoscroller boards
« Reply #18 on: July 22, 2015, 10:05:23 PM »
What iron are you using?  It sounds like your tip may be a bit to large and the temp may be a bit too cool.
I'm using the smallest tip I could find for my radioshack station.
I tend to use a pretty high temp setting with the idea of apply the solder quickly and don't have too long with a persistent heat.  At 750 deg farenheit... i'm likely too high.

I use very thin gauge, 0.020,  63/37 solder for all my boards, plus a narrow chisel tip.
I used .031" .. but I just found .020" in my stockpile, and will try that with the next board.

I would nearly bet that the problem will be 1 of the vias that are close to the pads for either P10 connectors o the bbb headers. There is only about 8 thou clearance and the solder mask doesn't have full tenting to cover the copper. This makes it very easy to bridge between the pads and the vias. A decent quality 0.7mm solder definitely makes things easier too. Using 1mm or 1.4mm as is common for those who don't do a lot of soldering makes it very easy to bridge.
I'm not familiar with a "via" Are they the large number of tiny holes placed throughout the board -- what I thought were used for test points?  If not, could you attach a marked up pic to point this out?

Something I mentioned to David last week was the idea of a possible modified Octoscroller which included a RTC.
I like the idea of the standalone unit with RTC!

UPDATE: i just looked at the original board once again and FINALLY found a bridge between a couple of the BBB pin solder points that I missed many times before`. 

I just connected the BBB with cape, and now the system boots!  Thanks everyone for the advice... I'm sure the next one will go better. :)

BTW, my apologies for hijacking the thread with troubleshooting advice.
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Online JonB256

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Re: Interest Thread for Octoscroller boards
« Reply #19 on: July 22, 2015, 10:15:06 PM »
A "Via" does look like a test point, but is really a way to transfer a copper run from 1 layer of the board to another.

Useful for jumping over and around things.

Offline Steve Gase

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Re: Interest Thread for Octoscroller boards
« Reply #20 on: July 22, 2015, 10:24:40 PM »
ahhh... thanks for the explanation!

Offline XmasInGalt

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Re: Interest Thread for Octoscroller boards
« Reply #21 on: July 23, 2015, 12:33:32 AM »
I'd be interested in 2.  Thanks.

Offline mello_roberto

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Re: Interest Thread for Octoscroller boards
« Reply #22 on: July 23, 2015, 11:23:38 PM »
I will take 3-4, thanks
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Offline tucsonlights

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Re: Interest Thread for Octoscroller boards
« Reply #23 on: July 24, 2015, 09:49:01 AM »
interested in 3. thanks

Offline tthompson

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Re: Interest Thread for Octoscroller boards
« Reply #24 on: July 25, 2015, 10:36:35 AM »
I am interested in 2 please.

Offline ChuckM

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Re: Interest Thread for Octoscroller boards
« Reply #25 on: July 25, 2015, 02:40:00 PM »
I am interested in 4 please.

Offline Bshaver

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Re: Interest Thread for Octoscroller boards
« Reply #26 on: July 26, 2015, 10:07:45 AM »
Please put me down for 4.
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Offline Frankr

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Re: Interest Thread for Octoscroller boards
« Reply #27 on: July 26, 2015, 10:30:58 AM »
I would be in for 2.

Offline mschell

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Re: Interest Thread for Octoscroller boards
« Reply #28 on: July 27, 2015, 08:18:22 PM »
I have an interest in 2-3, shipped to the US.


However, if this doesn't happen soon, I may just go down the "get the PCB and do it myself" road....so I'm definitely interested in something soon!


Mark

Offline mello_roberto

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Re: Interest Thread for Octoscroller boards
« Reply #29 on: July 27, 2015, 10:04:36 PM »
I have an interest in 2-3, shipped to the US.


However, if this doesn't happen soon, I may just go down the "get the PCB and do it myself" road....so I'm definitely interested in something soon!


Mark



I will need one in a month.
Where can we get one if this doesn't work out?

Thanks

 

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