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How do I connect the Extender to Cobra II Wifi?


#1

I have a Cobra II Wifi and an Extender (https://www.ghielectronics.com/catalog/product/439). I am unclear as to how to connect them. The Extender came without any gadgeteer cables or instructions. The product page similarly contains no information. It also seems like there is a battery slot.

My questions.

  1. How do I actually connect the extender to the board?
  2. Does the extender need a battery. If so, what type?

Thanks.


#2

It looks like you could do it several ways. Simplest would be to use a row of .1" male header soldered to the Cobra-II on one end and the extender on the other. This would be a fairly permanent way to do it. Another option would be to use a female header on the Cobra-II and a male header on the extender and insert one into the other. The would make the extender removable if it needs to be. A third option is possibly to align the boards perfectly and directly solder them via the through hole. That could be a bit tricky and difficult to undo if it didn’t work out.

I believe its optional to keep the RTC going. Looks like it uses a CR2032 but I can’t confirm that.


#3

I was hoping for a gadgeteer-type answer, e.g. connecting the extender via a gadgeteer cable. Is there anyway to do that?


#4

The extender’s purpose is to turn the pins along the header into Gadgeteer sockets, so it must be soldered pin-to-pin or using headers, as suggested by @ ianlee74


#5

[quote=“ianlee74”]Another option would be to use a female header on the Cobra-II and a male header on the extender and insert one into the other. The would make the extender removable if it needs to be.
[/quote]

Could you point me to a place where I can buy these female and male headers? Does Radio Shack have something like that? Is it a standard size part or will I have to hunt for something Cobra || specific?


#6

0.1" is a “standard” header size, yes. Not sure if RS will stock them, but here’s an example from ebay (where I buy all mine from).

Male: http://www.ebay.com.au/itm/10-Pieces-1x40-Single-Row-Male-0-1-2-54-Breakable-Pin-Header-/121062617070?pt=AU_B_I_Electrical_Test_Equipment&hash=item1c2fe4efee
Female: http://www.ebay.com.au/itm/10-Pieces-1x40-Single-Row-Female-0-1-2-54-Pin-Header-/121126061705?pt=AU_B_I_Electrical_Test_Equipment&hash=item1c33ad0689

If you count the # connectors there for me, I’ll send you a set from AU if you can wait.


#7

Thanks for the offer. But I am trying to do soon, hopefully this weekend.


#8

no worries. I just searched on radioshack.com for 0.1 and didn’t find anything. Perhaps the best option if you’re US based is https://www.sparkfun.com/products/115 and https://www.sparkfun.com/products/116 and find a local reseller/stockist?


#9

Thanks, that’s perfect. Any idea why the Cobra II board and the extender have 41 pins instead of 40? Is the last pin unused?


#10

40 is just an arbitrary number, and seems to be the common length of both of these connectors. I’d get a handful of each, and cut them as a group of 20 and 21, or some other combination that totals 41. Alternatively, if you didn’t want one of the end pins (VIN or P0.5; if you want to use CAN then you need to choose to not connect VIN). This way you could still solder a header or some other connector onto VIN to connect to a higher voltage source (the schematics of the extender don’t show the “12V” line being used anywhere else so it’s OK to not connect it, but if you have a multimeter you could check there’s no other exposed pad for this connection)


#11

Well, if you want to do something this weekend and you can’t find the header a “gadgeteer-type” answer might be to find an old 40-wire IDE cable and use a piece of it to solder between the two boards. You could later remove it fairly easily if you wanted to replace with headers.


#12

Can’t find female sockets for a 40 pin header on Mouser. Anyone had luck finding a pair of header pins with matching sockets on Mouser - to solder on each board?

Or anyone came up with a better solution?


#13

@ njbuch - I got my male-female pair on ebay.


#14

I bought a bunch on ebay as well. I use a lot, it seems, but I still have a lot too. I’d look at something like this http://www.ebay.com.au/itm/20pc-0-1-2-54mm-40-pin-Male-Female-Tin-Square-Breadboard-Header-connector-Strip-/151032561128?pt=LH_DefaultDomain_0&hash=item232a3dfde8 or http://www.ebay.com.au/itm/0-1-2-54mm-40-pin-50pcs-Male-50pcs-Female-Tin-Square-Breadboard-Header-Strip-/390582894515?pt=LH_DefaultDomain_0&hash=item5af08dffb3 since you end up with a good quantity of both male and female.


#15

Thanks guys, will buy a pile on ebay.

Considering that it would be a nice gestus of GHI to put a pair of headers with the extender board.