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