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'[EE] Carrier Board Pins'
2004\10\28@193921 by Gordon Williams

picon face
Hi,

I'm developing an application that is using using a 16F648 (4K prog) and I
have run out of rom and would like to move to an 8K device.  From what I
have been able to see is that all 8K devices start with at least 28 pins
which, of course won't fit into the 18 pin dip socket that I am currently
using.  As well the pinout is all wrong.

To carry on development without completely redesigning the main board I was
thinking of making a carrier board for the 28 pin device and then take the
lines that I needed to some pins that could plug into the 18 pin dip socket.
The problem is with the pins.  I've looked through the digikey cataloge, but
I can't see anything that will do the job because they look too big.  I'm
not really sure what should be used in this application, so any hints would
be appreciated.

Thanks,

Gordon Williams

____________________________________________

2004\10\29@025006 by Wouter van Ooijen

face picon face
> The problem is with the pins.  I've looked through the
> digikey cataloge, but
> I can't see anything that will do the job because they look
> too big.  I'm
> not really sure what should be used in this application, so
> any hints would
> be appreciated.

I sell these pin strips: http://www.voti.nl/shop/p/DB-QPIN20.html

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu


____________________________________________

2004\10\29@074620 by olin_piclist

face picon face
Gordon Williams wrote:
> I'm developing an application that is using using a 16F648 (4K prog)
> and I have run out of rom and would like to move to an 8K device.  From
> what I have been able to see is that all 8K devices start with at least
> 28 pins which, of course won't fit into the 18 pin dip socket that I am
> currently using.  As well the pinout is all wrong.
>
> To carry on development without completely redesigning the main board I
> was thinking of making a carrier board for the 28 pin device and then
> take the lines that I needed to some pins that could plug into the 18
> pin dip socket. The problem is with the pins.  I've looked through the
> digikey cataloge, but I can't see anything that will do the job because
> they look too big.  I'm not really sure what should be used in this
> application, so any hints would be appreciated.

Get 18 and 28 pin "machined" DIP sockets.  These are stackable in that the
pins are round and thin and can be plugged into another socket.  You'll have
to manually wire 18 wires from the pins of the 28 pin socket to the holes of
the 18 pin socket.  Once the wires are correct and verified, apoxy the whole
mess together so that the wires aren't stressed.

What is your application?  Why did you run out of space?  Are you using
assembler or a compiler?  is this a one-off or volume product?


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com
____________________________________________

2004\10\29@081942 by Gordon Williams

picon face

>
> I sell these pin strips: http://www.voti.nl/shop/p/DB-QPIN20.html
>
> Wouter van Ooijen
>

Are these pins able to fit into a cheap plastic dip socket or only the
machined type?

I saw similar ones in Digikey, but I thought that they might be too big.

Gordon Williams

____________________________________________

2004\10\29@083244 by Gordon Williams

picon face

----- Original Message -----
From: "Olin Lathrop" <spam_OUTolin_piclistTakeThisOuTspamembedinc.com>
I'm not really sure what should be used in this
> > application, so any hints would be appreciated.
>
> Get 18 and 28 pin "machined" DIP sockets.  These are stackable in that the
> pins are round and thin and can be plugged into another socket.  You'll
have
> to manually wire 18 wires from the pins of the 28 pin socket to the holes
of
> the 18 pin socket.  Once the wires are correct and verified, apoxy the
whole
> mess together so that the wires aren't stressed.
>
> What is your application?  Why did you run out of space?  Are you using
> assembler or a compiler?  is this a one-off or volume product?
>

This sounds like a bit of a mess if I understand correctly.  You are not
using a small piece of PCB here are you?  As well, will the machined pins of
the 18 pin dip fit an ordinary cheap dip socket on only another machined
socket?  I have see some header pins but they are 0.020" pins and I didn't
know if they would fit.

It's a GPS data logging application where I am sending the info out to a MMC
card with FAT.  I also need to parse some of the gps data and send it to an
LCD as a number of screens.

Works well, but I have only a few bytes left and there are still a number of
things to implement.

Gordon Williams

____________________________________________

2004\10\29@085636 by John J. McDonough

flavicon
face
----- Original Message -----
From: "Gordon Williams" <.....g_willKILLspamspam@spam@cyberus.ca>
Subject: Re: [EE] Carrier Board Pins


> This sounds like a bit of a mess if I understand correctly.  You are not
> using a small piece of PCB here are you?  As well, will the machined pins
of
> the 18 pin dip fit an ordinary cheap dip socket on only another machined

Gordon

The machined pins are round, the socket end of the cheap DIP sockets are
essentially two flat leaves that squeeze together.  It is no problem putting
machined pins into the cheap socket.   I use an 18 pin machine DIP socket as
a plug for my ICSP cable.

In fact, if you go to my lessons page
(http://www.amqrp.org/elmer160/lessons) and look at appendix B there is a
decent picture of a machine pin DIP socket in a cheap tin socket.

However, the pin end of the cheap sockets tends to be big and flat, these
will generally not fit into the socket end of a machine pin socket.

--McD


____________________________________________

2004\10\29@091404 by Wouter van Ooijen

face picon face
> Are these pins able to fit into a cheap plastic dip socket or only the
> machined type?
>
> I saw similar ones in Digikey, but I thought that they might
> be too big.

If your socket is the cheap type (single or dual wipe, flat pins), and
you need to insert only once, I'd suggest that you use the common
(thick) pin strips.

If your socket is the machined (round) type, or you use no socket, use
the shown type of strip. It's more expensive than the plain (thick)
pins, but can be inserted multiple times in a machined socket.

I have my doubts about using the shown type of strip with a cheap
socket, but it will probably work.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu


____________________________________________

2004\10\29@100240 by olin_piclist

face picon face
Gordon Williams wrote:
> This sounds like a bit of a mess if I understand correctly.

Yes, it is.  I see Wouter has responded that he sells adapters for this
purpose.  That sounds like a much better idea.

> As well, will the machined pins of the 18 pin dip fit an ordinary
> cheap dip socket

Yes.


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com
____________________________________________

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