[Ovmsdev] Prototyping expansion board

Thu Apr 18 14:48:14 HKT 2019

>  - What about extending the 12V rail all the way to the end of column 16, parallel to the ground rail?

Would most projects require 12V? I thought 3.3v and GND would be the most useful?

We could extend the 12V, but I worry it is a little close to that GND batch.

>   - Currently, all the holes are isolated. Would there be any benefit to connecting the holes in each row in groups of 3 or 4?

I personally prefer isolated. Allows for the most flexibility. But I have seen designs with connected rows as well.

The current design is intended to maximise the number of holes available. Designer has said he is trying to tidy it up now, and then will make a few samples to see how it looks/fits.

Regards, Mark.

> On 18 Apr 2019, at 11:18 AM, Brian Greenberg <grnbrg at grnbrg.org> wrote:
> 
> Put me down for package - I've been thinking about driving a handful of relays for various things, and have been thinking about having a small number of boards like this done - it's pretty much impossible to find a generic prototype board with 2mm pitch holes... 
> 
> Although I'm no designer....
> 
>   - What about extending the 12V rail all the way to the end of column 16, parallel to the ground rail?
>   - Currently, all the holes are isolated. Would there be any benefit to connecting the holes in each row in groups of 3 or 4?
> 
> 
> Brian. 
> 
> On Wed., Apr. 17, 2019, 19:37 Mark Webb-Johnson, <mark at webb-johnson.net <mailto:mark at webb-johnson.net>> wrote:
> It seems the attachments were messed up, so attaching again…
> 
> Regards, Mark.
> 
> 
> 
>> On 17 Apr 2019, at 10:07 PM, Mark Webb-Johnson <mark at webb-johnson.net <mailto:mark at webb-johnson.net>> wrote:
>> 
>> 
>> Design layout. Looks good to me, but open to suggestions...
>> 
>> We can make in sets of three PCBs, to keep prices down.
>> 
>> Regards, Mark
>> 
>> 
>> On 8 Apr 2019, at 12:05 PM, Mark Webb-Johnson <mark at webb-johnson.net <mailto:mark at webb-johnson.net>> wrote:
>> 
>>> 
>>> A kit of 5 PCBs + SIP edge connectors + mounting hardware, unsoldered, would be about US$15 + shipping. About US$3/board set. With shipping I don’t think this is worth doing with less than 3 or 5 boards per kit.
>>> 
>>> Would this be useful?
>>> 
>>> Regards, Mark.
>>> 
>>>> On 7 Apr 2019, at 9:08 PM, Mark Webb-Johnson <mark at webb-johnson.net <mailto:mark at webb-johnson.net>> wrote:
>>>> 
>>>> This is the closest we have today:
>>>> 
>>>> <image1.jpeg>
>>>> 
>>>> That is a bare modem board, with just the sip connectors. The prototype above is a K-line transceiver.
>>>> 
>>>> I think it would be trivial, and cheap, to make up what you show. Perhaps just solder ready pads at 0.1” pitch, then the side sip connectors wired to the first row of pads at each edge. Perhaps 5 PCBs in a kit, with sip edge connectors, unsoldered, in a simple plastic bag.
>>>> 
>>>> Does that sound like something useful? If so, I can ask the China guys for some idea of pricing. If it is just the unsoldered pcbs + parts, I don’t think it will be expensive.
>>>> 
>>>> Regards, Mark
>>>> 
>>>> On 7 Apr 2019, at 4:38 PM, Michael Balzer <dexter at expeedo.de <mailto:dexter at expeedo.de>> wrote:
>>>> 
>>>>> Mark,
>>>>> 
>>>>> do you know of some kind of prototyping board available that fits to our piggy back expansion layout?
>>>>> 
>>>>> Something like this: https://www.robotshop.com/de/de/cytron-arduino-proto-schild.html <https://www.robotshop.com/de/de/cytron-arduino-proto-schild.html>
>>>>> 
>>>>> Regards,
>>>>> Michael
>>>>> 
>>>>> 
>>>>> Am 03.04.19 um 06:48 schrieb Mark Webb-Johnson:
>>>>>> 
>>>>>> If you have work to do on this DA26 expansion ports, this is pretty cool and well built:
>>>>>> 
>>>>>> https://www.aliexpress.com/item/26-Pin-D-SUB-DB26-3-Rows-Serial-Parallel-Port-Serial-Shellless-Male-And-Female-Connector/32886738786.html?spm=a2g0s.9042311.0.0.20924c4dg34EEU <https://www.aliexpress.com/item/26-Pin-D-SUB-DB26-3-Rows-Serial-Parallel-Port-Serial-Shellless-Male-And-Female-Connector/32886738786.html?spm=a2g0s.9042311.0.0.20924c4dg34EEU>
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
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>>>>> 
>>>>> -- 
>>>>> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
>>>>> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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