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Topic: Tiny 8-pin connector (Read 2725 times) previous topic - next topic

DrAzzy

#15
Sep 30, 2015, 09:45 pm Last Edit: Sep 30, 2015, 09:45 pm by DrAzzy
The moment you depart from common connectors (like the 0.1" DuPont connectors and 0.1" headers), you start having to work with difficult connectors (the crimp tools are hard to find, expensive, and hard to use), which are expensive, less readily available, and heaven help you if you forget the exact part numbers of the matching connector - You'll never find it again!

It's like the tower of babel, where God cursed man for trying to reach heaven by causing everyone to speak different languages. I don't know what we did to bring the same curse upon us w/regards to connectors, but we must have made Him pretty angry... There are tens or hundreds of thousands of different connector designs, many of which are almost indistinguishable until you try to plug one into the other, and they don't fit. Not only that, confusion about the proper naming scheme abounds - a while back it took me three tries to obtain something to plug into a JST-PHR-2 connector - they all said that's what they were, but they were all different. Several people suggested a "JST" connector - okay, which one? JST is a company, they make connectors ("Japan Solderless Terminal"). They have a huge line of connectors in a great variety of sizes, shapes, and pin counts - So a "JST connector" could be any of the hundreds of connectors they sell. And there are multiple similarly large connector outfits (molex and amp come to mind). There's a huge amount of choice, and as far as I can tell, below 0.1" pin header and dupont jumpers, there's not any particular option that's popular enough to be the "go to" connector.

If you could spare just a wee bit more space, you could fit a 4x2 right angle 0.1" pin header on the edge, and you wouldn't have to worry about maintaining a stockpile of exotic connectors...

tldr: Exotic connectors are nothing but trouble.
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MarkT

If you want 6 or 10 pin and budget is no problem, maybe Tag-Connect? http://www.tag-connect.com/catalog

They are used for programming microcontrollers, so the plug/cable is expensive, but no socket
is needed, just a specific pad/hole layout on the PCB.
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larryd

#17
Sep 30, 2015, 09:47 pm Last Edit: Sep 30, 2015, 09:50 pm by LarryD
Measured DuPont.
10mm long, 5mm wide and 15mm height (in the direction of the cable)

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DrAzzy

This is dirty but - if the use is really infrequent, you can even use standard 0.1" header holes, and put header into those holes and apply gentle pressure at an angle with your hand to keep it in contact while you program it.

This is how I bootload the boards I sell that don't come with pin header attached.
ATTinyCore for x4/x5/x61/x7/x8/x41/1634/828/x313 megaTinyCore for the megaavr ATtinies - Board Manager:
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jboyton

If you want 6 or 10 pin and budget is no problem, maybe Tag-Connect? http://www.tag-connect.com/catalog

They are used for programming microcontrollers, so the plug/cable is expensive, but no socket
is needed, just a specific pad/hole layout on the PCB.
Those are pretty cool. I'd only need one but still kind of expensive.

jboyton

Measured DuPont.
10mm long, 5mm wide and 15mm height (in the direction of the cable)
15mm height is 3x too much.

jboyton

#21
Sep 30, 2015, 10:01 pm Last Edit: Sep 30, 2015, 10:04 pm by jboyton
This is dirty but - if the use is really infrequent, you can even use standard 0.1" header holes, and put header into those holes and apply gentle pressure at an angle with your hand to keep it in contact while you program it.

This is how I bootload the boards I sell that don't come with pin header attached.
Really? That is kind of a dirty method. How often do you have programming issues?

Six of the pins are for programming so maybe that could work. The other two pins are for signals that must be maintained for a longer period (a few hours), but a lot less frequenty. Maybe just one time only. I could solder/desolder them. Actually it's three of them since I'd need a ground connection too.

Coding Badly

I want to be able to occasionally connect a cable with 8 wires to an AVR that is on a small PCB. It's the connector on the PCB that I want to be of minimum length, width and height. An FFC connector is one possibility but I'm sure there are many others.
I have been drifting to an edge connector.  On the plus side, the target "connector" is essentially free.  On the negative side, a PCB edge has to be accessible.

If you are interested I will dig up the part number and my initial pass at pin assignments.


jboyton

An edge connector is a very interesting idea. How deep would it have to slide onto the board?


larryd

These are too big but FYI
http://www.ebay.ca/itm/20sets-JST-8-Way-8Pin-SM-2-5mm-Battery-Connector-Plug-SM2-5-8P-/121512253229?hash=item1c4ab1d72d
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jack wp

micro sd card connector uses 8 pins.

Boardburner2

Possibly a thin pcb would make a easy plug for that ?

Coding Badly


This is the one I'm using...
http://www.digikey.com/product-detail/en/RBB06DHHN/S3364-ND/927316

The maximum insertion depth is 0.3 inches.  I don't know what the minimum is.  The bellows are close to the opening; I suspect 0.1 inches is enough to make reliable contact.

PCBs from OSH Park fit snuggly.


larryd

#28
Oct 01, 2015, 02:26 am Last Edit: Oct 01, 2015, 02:26 am by LarryD
Interesting CB, Thanks for sharing.
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Coding Badly


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