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'[PIC:] Picstart plus as an in circuit programmer? '
2004\01\27@125129 by David Schmidt

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I'd like to use an SSOP 20 packaged 16F627A in a project.  I have a picstart plus, but no programming adapter for an SSOP20.
I would like to solder the SSOP20 into my PCB and program it "in-circuit" using my picstart plus (also I may need to change the firmware later to correct for bugs).

- Is the in-circuit programming of the 16F627A the same hookup, voltages and algorithm that the picstart plus uses?
(can I just jumper over the 5 pins needed for in-circuit programming from the picstart plus?)

Thanks.  The microchip website didn't list the picstart plus as being able to program in-circuit, but I suspect that is just because they don't offer a hookup cable.

Dave

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2004\01\27@131413 by Robert Reimiller

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On Tue, 27 Jan 2004 09:51:20 -0800, you wrote:
>- Is the in-circuit programming of the 16F627A the same hookup, voltages and algorithm that the picstart plus uses?
>(can I just jumper over the 5 pins needed for in-circuit programming from the picstart plus?)
>
I did that for a 16F74 and it worked fine. Make sure you don't have any
electrolytics or tantalum capacitors on the VDD line to the PIC, the picstart
doesn't have the power to charge those fast enough.

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2004\01\27@135529 by Mike Harrison

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On Tue, 27 Jan 2004 18:12:15 +0000, you wrote:

>On Tue, 27 Jan 2004 09:51:20 -0800, you wrote:
>>- Is the in-circuit programming of the 16F627A the same hookup, voltages and algorithm that the picstart plus uses?
>>(can I just jumper over the 5 pins needed for in-circuit programming from the picstart plus?)
>>
>I did that for a 16F74 and it worked fine. Make sure you don't have any
>electrolytics or tantalum capacitors on the VDD line to the PIC, the picstart
>doesn't have the power to charge those fast enough.

if Vcc is loaded, you can supply an external 5V for Vcc and this usually works OK, for all but the
8-pin devices, which need VCC on/off control.

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2004\01\27@144553 by Dwayne Reid

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At 10:51 AM 1/27/2004, David Schmidt wrote:
>I'd like to use an SSOP 20 packaged 16F627A in a project.  I have a
>picstart plus, but no programming adapter for an SSOP20.
>I would like to solder the SSOP20 into my PCB and program it "in-circuit"
>using my picstart plus (also I may need to change the
>firmware later to correct for bugs).
>
>- Is the in-circuit programming of the 16F627A the same hookup, voltages
>and algorithm that the picstart plus uses?
>(can I just jumper over the 5 pins needed for in-circuit programming from
>the picstart plus?)
>
>Thanks.  The microchip website didn't list the picstart plus as being able
>to program in-circuit, but I suspect that is just because they don't offer
>a hookup cable.

The PS+ is definitely capable of doing ICSP.  You may need to buffer the
supply voltages and possibly even the data & clock lines, depending upon
what your circuit configuration looks like.

I'll give a specific example: one of our products uses either a 12c508 or a
12f675, depending upon which variant is being produced.  These are built
several hundred at a time with blank chips.  We use a PS+ to program the
chips in circuit: both Vdd & Vpp have active buffers as per Microchip
app-note TB017 and the clock & data lines have the simple 'stoopid' buffers
I described several months ago.  The 'stoopid' buffers are required because
the programming pins have heavy loads (820R) tied permanently to the pins
and the PS+ cannot drive those loads.  Works well.

dwayne

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2004\01\27@154444 by Robert Reimiller

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Here's how we've been doing our in circuit programming. We have a 10 pin
header:

System VDD ------O    O----- PIC VDD
Reset Chip ------O    O----- PIC MCLR
system RB7 ------O    O----- PIC RB7
system RB6 ------O    O----- PIC RB6
          ------O    O----- System & PIC Ground (VSS)

For normal operation, jumpers are placed across the top 4 spaces to
connect the PIC pins to where they normally go. To program, the
jumpers are removed and a cable is plugged in that connects to the
right hand pins and is connected at the other end to the Picstart plus.
This way you don't have to worry about loading the programmer signals.

Bob

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2004\01\27@155546 by

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Dwayne Reid wrote :

> I'll give a specific example: one of our products uses either
> a 12c508 or a 12f675, depending upon which variant is being
> produced. These are built several hundred at a time with
> blank chips.  We use a PS+ to program the chips in circuit...

Does the PS+ perform verify over the full Vcc range ?
(As a "production programmer" does ?)

And, if not, is that a (potential) problem ?
Or is it just a "it depends" issue ? :-)

Regards
Jan-Erik.

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2004\01\27@160835 by Bob Axtell

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part 0 44 bytes
his is a multi-part message in MIME format.
part 1 1467 bytes content-type:text/plain; charset=us-ascii; format=flowed (decoded 7bit)

David Schmidt wrote:

> I'd like to use an SSOP 20 packaged 16F627A in a project.  I have a picstart plus, but no programming adapter for an SSOP20.
> I would like to solder the SSOP20 into my PCB and program it "in-circuit" using my picstart plus (also I may need to change the
> firmware later to correct for bugs).
>
> - Is the in-circuit programming of the 16F627A the same hookup, voltages and algorithm that the picstart plus uses?
> (can I just jumper over the 5 pins needed for in-circuit programming from the picstart plus?)

Er, well, yes and no. I can do it, but I have a Schottky diode between
the F627 and VCC, so that the programmer can powerup the F627 and not
the rest of the board. The reasons are (1) the PICSTART can't deliver
enough current to power other chips, and (2) large external caps on the
VCC line will prevent the F627 from being properly reset.

Works GREAT for me. I use a .1uF cap across the chip itself for normal
bypassing.

I have enclosed a PDF of how I do it.

--Bob

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part 2 12001 bytes content-type:application/pdf; (decode)

2004\01\27@161042 by Wouter van Ooijen

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> Does the PS+ perform verify over the full Vcc range ?
> (As a "production programmer" does ?)

Nope, it's a prototype programmer. But I guess in a pinch you could use
a bench supply to do a multiple-vcc verification. But combined with code
protection this becomes a bit tedious.

IMHO the prototype-production distinction is not so hot any more with
the flash PICs. When you use a (flash) PIC for let's say a Mars rover
you might of course feel different.

Wouter van Ooijen

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2004\01\27@163521 by Olin Lathrop

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Jan-Erik Soderholm XA (TN/PAC) wrote:
> Does the PS+ perform verify over the full Vcc range ?
> (As a "production programmer" does ?)

No.  As far as I know, only the Promate and my programmer
(http://www.embedinc.com/easyprog) verify at the Vdd limits.


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(978) 742-9014, http://www.embedinc.com

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2004\01\27@164557 by Jinx

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> For normal operation, jumpers are placed across the top 4
> spaces to connect the PIC pins to where they normally go. To
> program, the jumpers are removed and a cable is plugged in

That's a pretty easy way to do it (and you can glue the 4 jumpers
together). I've been looking around for a "switching" header to
bypass the need to isolate the PIC before programming. I've
made one from a piece of edge connector and springy contacts
from an edge socket like this (four side by side, 0V isn't broken)

|/
|\
||
||
ab

where "a" goes to the PIC and "b" goes to the rest of the circuit,
and the ICSP breaks the contact and connects to "a" but it was a
real fiddly PITA. Works OK but it's uncertain how long this homer
will keep good ohmic contact when the unit is out in the field, even
with gold plating. And I don't fancy trying to make more than a few
of them. Anyone know of anything suitable off-the-shelf ?

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2004\01\27@170016 by Dwayne Reid

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At 01:49 PM 1/27/2004, Jan-Erik Soderholm XA (TN/PAC) wrote:
>Dwayne Reid wrote :
>
> > I'll give a specific example: one of our products uses either
> > a 12c508 or a 12f675, depending upon which variant is being
> > produced. These are built several hundred at a time with
> > blank chips.  We use a PS+ to program the chips in circuit...
>
>Does the PS+ perform verify over the full Vcc range ?
>(As a "production programmer" does ?)
>
>And, if not, is that a (potential) problem ?
>Or is it just a "it depends" issue ? :-)

Nope - its not a production programmer.  However, this has not caused any
problems to date.  At some point, we will be switching to a programmer that
does do verification at the supply limits.

The programming algorithms seem robust.  Everyone that I've talked to who
does do verification at the supply limits has not yet seen a part fail at
the supply limits that did not also fail at the programming voltage.

In fact, I'd like to pose that same question to the members of the PIClist
- Has anyone ever had a PIC verify at the normal Vdd voltage but fail to
verify at the supply limits (either above or below the programming
voltage)?  In other words, Vdd normal: pass, Vdd low: pass, Vdd high: fail
(or vice versa).

dwayne

--
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Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

Celebrating 19 years of Engineering Innovation (1984 - 2003)
 .-.   .-.   .-.   .-.   .-.   .-.   .-.   .-.   .-.   .-
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2004\01\27@170441 by Antonio Sergio Sena

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There is ProPic that also tests on the VCC range.


Antonio Sergio Sena





{Quote hidden}

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2004\01\27@172551 by steve

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> In fact, I'd like to pose that same question to the members of the
> PIClist - Has anyone ever had a PIC verify at the normal Vdd voltage
> but fail to verify at the supply limits (either above or below the
> programming voltage)?  In other words, Vdd normal: pass, Vdd low:
> pass, Vdd high: fail (or vice versa).

Yes, although it's not that applicable. Windowed parts will do that if they
aren't erased enough.
I've had flash AVR's, OTP PICs and 87LPC micros that would fail at
supply limits. In all cases, the failure was repeatable. Verify at 5V is OK
but at supply range, they'd fail and not always at the same location.
After over-programming or erasing and reprogramming all is well.
I don't think I've seen a flash PIC do it. I did have a lot of problems with
a 1Mbit 5V flash rom a few years back but otherwise, it's pretty
uncommon. Maybe one in a few thousand, if that. It does seem to be
batch related.

Steve.




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2004\01\27@172756 by Tom

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At 02:56 PM 1/27/04 -0700, you wrote:
>At 01:49 PM 1/27/2004, Jan-Erik Soderholm XA (TN/PAC) wrote:
>>Dwayne Reid wrote :

>In fact, I'd like to pose that same question to the members of the PIClist
>- Has anyone ever had a PIC verify at the normal Vdd voltage but fail to
>verify at the supply limits (either above or below the programming
>voltage)?  In other words, Vdd normal: pass, Vdd low: pass, Vdd high: fail
>(or vice versa).


Anecdotal evidence: Over the last 10 years, maybe 500 to 600 (or more) pics
programmed with a "single voltage programmer" that have never shown
indications of problems.  Of that total, maybe 2 or 3 parts failed to
program at all and of those, 1 or 2 might have been due to flakey contacts
while programming.

Yes, the manufacturer says you get a higher confidence rating if you check
at different voltages. But as with many things in this industry, I willing
to bet that PIC chips made 20 years ago *did have* problems and in the
intervening time, the process control has improved enough to not require it.

But always remember: I *could* be wrong and your mileage *will* vary...

Tom

ps: It wouldn't surprise me to find out that application ambient
temperature range is a more important factor here. If so, you would need to
test over temperature...

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2004\01\27@185633 by Olin Lathrop

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Dwayne Reid wrote:
> In fact, I'd like to pose that same question to the members of the
> PIClist
> - Has anyone ever had a PIC verify at the normal Vdd voltage but fail
> to verify at the supply limits (either above or below the programming
> voltage)?

Yes.  I had some 16LF628s that weren't quite as L as they were supposed to
be.


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(978) 742-9014, http://www.embedinc.com

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2004\01\27@185633 by Olin Lathrop

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Dwayne Reid wrote:
> In fact, I'd like to pose that same question to the members of the
> PIClist
> - Has anyone ever had a PIC verify at the normal Vdd voltage but fail
> to verify at the supply limits (either above or below the programming
> voltage)?

Yes.  I had some 16LF628s that weren't quite as L as they were supposed to
be.


*****************************************************************
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(978) 742-9014, http://www.embedinc.com

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2004\01\27@193653 by Matt Pobursky

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On Tue, 27 Jan 2004 14:56:06 -0700, Dwayne Reid wrote:
> In fact, I'd like to pose that same question to the members of the
> PIClist - Has anyone ever had a PIC verify at the normal Vdd voltage
> but fail to verify at the supply limits (either above or below the
> programming voltage)?  In other words, Vdd normal: pass, Vdd low:
> pass, Vdd high: fail (or vice versa).

Yes, back when I was first doing ICSP with my Picstart+ I had a few
16C65's that acted a little flaky after programming. I put them
aside and several months later I purchased a ProPic2 ICSP programmer
that does high/low voltage verify. I decided to check out the flaky
16C65 boards with the new ProPic2 programmer. They failed low voltage
verify. For my own curiosity I re-programmed the questionable units
(some with the ProPic2 and some with the Picstart+) and they all then
verified at low voltage (and were no longer flaky). I've seen that
happen with byte-wide EPROMS in days past also.

BTW, the ProPic2 ICSP is an excellent ICSP programmer (and it's creator
is a member of the PIClist even!) Octavio are you out there? ;-)

http://www.propic2.com

Matt Pobursky
Maximum Performance Systems

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2004\01\27@193653 by Matt Pobursky

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On Tue, 27 Jan 2004 14:56:06 -0700, Dwayne Reid wrote:
> In fact, I'd like to pose that same question to the members of the
> PIClist - Has anyone ever had a PIC verify at the normal Vdd voltage
> but fail to verify at the supply limits (either above or below the
> programming voltage)?  In other words, Vdd normal: pass, Vdd low:
> pass, Vdd high: fail (or vice versa).

Yes, back when I was first doing ICSP with my Picstart+ I had a few
16C65's that acted a little flaky after programming. I put them
aside and several months later I purchased a ProPic2 ICSP programmer
that does high/low voltage verify. I decided to check out the flaky
16C65 boards with the new ProPic2 programmer. They failed low voltage
verify. For my own curiosity I re-programmed the questionable units
(some with the ProPic2 and some with the Picstart+) and they all then
verified at low voltage (and were no longer flaky). I've seen that
happen with byte-wide EPROMS in days past also.

BTW, the ProPic2 ICSP is an excellent ICSP programmer (and it's creator
is a member of the PIClist even!) Octavio are you out there? ;-)

http://www.propic2.com

Matt Pobursky
Maximum Performance Systems

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2004\01\27@211339 by Kevin Olalde

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Any indication of availability of this programmer?

Thanks,
Kevin

Olin Lathrop wrote:

{Quote hidden}

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2004\01\27@211339 by Kevin Olalde

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Any indication of availability of this programmer?

Thanks,
Kevin

Olin Lathrop wrote:

{Quote hidden}

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2004\01\27@221904 by M. Adam Davis

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Well, if the connection were only 3 pins then an audio jack would work.
In this case you can probably use two audio jacks, but there goes your
board realestate.

-Adam

Jinx wrote:

{Quote hidden}

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2004\01\27@221904 by M. Adam Davis

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Well, if the connection were only 3 pins then an audio jack would work.
In this case you can probably use two audio jacks, but there goes your
board realestate.

-Adam

Jinx wrote:

{Quote hidden}

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2004\01\27@222317 by M. Adam Davis

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Aside from all the other helpful adive about using the PS+ as an ICSP,
please note that while it is not programming the PS+ holds the chip in
reset.  So if you want to keep the ICSP connected during test runs,
you'll need to disconnect the MCLR wire while the chip runs.

-Adam

David Schmidt wrote:

{Quote hidden}

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2004\01\27@222317 by M. Adam Davis

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Aside from all the other helpful adive about using the PS+ as an ICSP,
please note that while it is not programming the PS+ holds the chip in
reset.  So if you want to keep the ICSP connected during test runs,
you'll need to disconnect the MCLR wire while the chip runs.

-Adam

David Schmidt wrote:

{Quote hidden}

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Subject: Re: [PIC:] divide by 10 question
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One step up from that, in the division index,
www.piclist.com/techref/microchip/math/div/index.htm
in Archive: list of links, there is a link to division by 10.

{Original Message removed}

2004\01\27@231411 by Jinx

face picon face
> Well, if the connection were only 3 pins then an audio jack would work.
> In this case you can probably use two audio jacks, but there goes your
> board realestate.
>
> -Adam

I did consider two switched 3.5mm headphone jacks but, as you
say, it's not a very attractive solution. It looks like I'll have to go back
to Plan A and do some fabrimicating with odds and sods in the
Rubbish Workshop

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2004\01\27@231411 by Jinx

face picon face
> Well, if the connection were only 3 pins then an audio jack would work.
> In this case you can probably use two audio jacks, but there goes your
> board realestate.
>
> -Adam

I did consider two switched 3.5mm headphone jacks but, as you
say, it's not a very attractive solution. It looks like I'll have to go back
to Plan A and do some fabrimicating with odds and sods in the
Rubbish Workshop

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2004\01\27@232239 by Techsavy

flavicon
face
Thanks to all for the information.
My plan is to have some small round SMT pads that I can pogo pin down on to
do my programming.  I need everything to be as small as possible so I cannot
use any jacks, headers, etc.

Now I know I can layout my PCB for an SSOP part, order the chips, and not
have to worry about not being able to program/reprogram it with my PS+ !

Dave

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2004\01\27@232239 by Techsavy

flavicon
face
Thanks to all for the information.
My plan is to have some small round SMT pads that I can pogo pin down on to
do my programming.  I need everything to be as small as possible so I cannot
use any jacks, headers, etc.

Now I know I can layout my PCB for an SSOP part, order the chips, and not
have to worry about not being able to program/reprogram it with my PS+ !

Dave

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From:         Richard Graziano <spamBeGonergrazia1KILLspamspam@spam@ROCHESTER.RR.COM>
Subject: Re: [BUY:] smt resistors help please!
To:           PICLISTspam_OUTspam@spam@MITVMA.MIT.EDU
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Is it possible to stand an axial lead resistor on end and solder it in?

{Original Message removed}

2004\01\28@002634 by Josh Koffman

flavicon
face
Ok, I might just have dreamed this one, but I seem to recall some sort
of RJ45 connector that was switched...am I imagining things, or does it
exist? Seems like it would be ideal in terms of connections, etc.

Am I crazy?

Josh
--
A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools.
       -Douglas Adams

Jinx wrote:
> I did consider two switched 3.5mm headphone jacks but, as you
> say, it's not a very attractive solution. It looks like I'll have to go back
> to Plan A and do some fabrimicating with odds and sods in the
> Rubbish Workshop

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2004\01\28@002634 by Josh Koffman

flavicon
face
Ok, I might just have dreamed this one, but I seem to recall some sort
of RJ45 connector that was switched...am I imagining things, or does it
exist? Seems like it would be ideal in terms of connections, etc.

Am I crazy?

Josh
--
A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools.
       -Douglas Adams

Jinx wrote:
> I did consider two switched 3.5mm headphone jacks but, as you
> say, it's not a very attractive solution. It looks like I'll have to go back
> to Plan A and do some fabrimicating with odds and sods in the
> Rubbish Workshop

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.

2004\01\28@015935 by Jinx

face picon face
> I seem to recall some sort of RJ45 connector that was
> switched...am I imagining things, or does it exist?
>
> Am I crazy?
>
> Josh

1. Can't think of any cheap, common connectors (more than
2-pole anyway) that are switched. What I could do is keep the
4 jumper headers and use a multi-pole toggle or rotary switch
with a 4x2 socket attached at the circuit end. It would get most
use during prototyping. After that the 4 jumpers can back on

2. Fo' shizzle

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2004\01\28@015935 by Jinx

face picon face
> I seem to recall some sort of RJ45 connector that was
> switched...am I imagining things, or does it exist?
>
> Am I crazy?
>
> Josh

1. Can't think of any cheap, common connectors (more than
2-pole anyway) that are switched. What I could do is keep the
4 jumper headers and use a multi-pole toggle or rotary switch
with a 4x2 socket attached at the circuit end. It would get most
use during prototyping. After that the 4 jumpers can back on

2. Fo' shizzle

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2004\01\28@021908 by Wouter van Ooijen

face picon face
> No.  As far as I know, only the Promate and my programmer
> (http://www.embedinc.com/easyprog) verify at the Vdd limits.

And there is always my antique WISP programmer (see
http://www.voti.nl/wisp, != Wisp628).

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products

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2004\01\28@021908 by Wouter van Ooijen

face picon face
> No.  As far as I know, only the Promate and my programmer
> (http://www.embedinc.com/easyprog) verify at the Vdd limits.

And there is always my antique WISP programmer (see
http://www.voti.nl/wisp, != Wisp628).

Wouter van Ooijen

-- -------------------------------------------
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consultancy, development, PICmicro products

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Precedence: list

Analogs sample system is really top notch.
problem you might have is picking the difference between the gate rattling
in the wind and the gate opening.
take a look at their digital PWM 10G or 2G sensor might work if you sum and
average etc over a period of time.
though if sombody opened it *really* slowly your screwed.

magnetic compas?
bringing a magnet near it should cause it to screw up enough that it will
trigger.



> {Original Message removed}

2004\01\28@073639 by dr. Imre Bartfai

flavicon
face
Hello,

it does also the SmartProg which I own and it is a nice and versatile
programmer. The support is excellent, too. I think it is worth to take a
look att http://www.elnec.sk

Regards,
Imre


On Tue, 27 Jan 2004, Olin Lathrop wrote:

{Quote hidden}

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2004\01\28@073639 by dr. Imre Bartfai

flavicon
face
Hello,

it does also the SmartProg which I own and it is a nice and versatile
programmer. The support is excellent, too. I think it is worth to take a
look att http://www.elnec.sk

Regards,
Imre


On Tue, 27 Jan 2004, Olin Lathrop wrote:

{Quote hidden}

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2004\01\28@075750 by Olin Lathrop

face picon face
Kevin Olalde wrote:
>> No.  As far as I know, only the Promate and my programmer
>> (http://www.embedinc.com/easyprog) verify at the Vdd limits.
>
> Any indication of availability of this programmer?

It is ready to go to production.  The only thing holding it up now is cash
flow of the initial production run.  An order for about 30 of them would
also allow it to happen.

After going thru this process, we now realize that the EasyProg as shown on
the web page is really an industrial product, not a hobbyist product.  To
provide at least some accessibility to hobbyists, I created an all thru-hole
version that uses easily obtainable parts.  I am thinking of making the bare
boards available with schematic and build directions.  This board has pads
for a 40 pin ZIF socket, the same RJ-12 connector as the ICD-2, and 5
labeled pads where the programming signals are brought out explicitly.  I
was intending that the directions include options for only populating some
parts depending on the features you wanted.  For example, you can cut the
parts cost in about half if you don't install the ZIF socket and some
associated circuitry needed for dealing with different pinouts.  That would
still allow use of the RJ-12 connector or the labeled pads.

I've got one of these new units built up but haven't had a chance to test it
yet.  I will update the EasyProg page when I do.  Assuming this thing works
as described, how much interest would there be for bare boards at around
$10-$15 plus shipping?


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

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2004\01\28@075750 by Olin Lathrop

face picon face
Kevin Olalde wrote:
>> No.  As far as I know, only the Promate and my programmer
>> (http://www.embedinc.com/easyprog) verify at the Vdd limits.
>
> Any indication of availability of this programmer?

It is ready to go to production.  The only thing holding it up now is cash
flow of the initial production run.  An order for about 30 of them would
also allow it to happen.

After going thru this process, we now realize that the EasyProg as shown on
the web page is really an industrial product, not a hobbyist product.  To
provide at least some accessibility to hobbyists, I created an all thru-hole
version that uses easily obtainable parts.  I am thinking of making the bare
boards available with schematic and build directions.  This board has pads
for a 40 pin ZIF socket, the same RJ-12 connector as the ICD-2, and 5
labeled pads where the programming signals are brought out explicitly.  I
was intending that the directions include options for only populating some
parts depending on the features you wanted.  For example, you can cut the
parts cost in about half if you don't install the ZIF socket and some
associated circuitry needed for dealing with different pinouts.  That would
still allow use of the RJ-12 connector or the labeled pads.

I've got one of these new units built up but haven't had a chance to test it
yet.  I will update the EasyProg page when I do.  Assuming this thing works
as described, how much interest would there be for bare boards at around
$10-$15 plus shipping?


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

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2004\01\28@114823 by John Plocher

picon face
Josh Koffman wrote:
> Ok, I might just have dreamed this one, but I seem to recall some sort
> of RJ45 connector that was switched...am I imagining things, or does it
> exist? Seems like it would be ideal in terms of connections, etc.
>
> Am I crazy?


You may or may not be crazy :-) but the RJ jack you are thinking
of was a "shorting" jack that would connect all the pins in the
jack together unless a plug was inserted.

IIRC, it was used to generate indications that eqpt had been
manually disconnected....

Since it shorts all the pins together, it isn't quite what
is needed here.

  -John

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2004\01\28@114823 by John Plocher

picon face
Josh Koffman wrote:
> Ok, I might just have dreamed this one, but I seem to recall some sort
> of RJ45 connector that was switched...am I imagining things, or does it
> exist? Seems like it would be ideal in terms of connections, etc.
>
> Am I crazy?


You may or may not be crazy :-) but the RJ jack you are thinking
of was a "shorting" jack that would connect all the pins in the
jack together unless a plug was inserted.

IIRC, it was used to generate indications that eqpt had been
manually disconnected....

Since it shorts all the pins together, it isn't quite what
is needed here.

  -John

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