Jon Elson wrote.
If the $100 is for a home-made milled PCB you put together
yourself, it
is quite possible, but that will take a lot of time to make
the board,
assemble and debug.
That's fine for a commercial unit Jon but I'm sure I'm not
the only person who would love to find an open
A lot of the dspics can be got from Farnell just up the road in Leeds
Dave Caroline
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Gentle persons:
I'm hearing echoes of a 30-year old story that a contributing editor of
one of the early microcomputing magazines (maybe Kilobaud) told. He got
a wild hair to make a simple interface card and sell it. His tale of woe
can be boiled down to I was losing money on every sale. What
Having been involved in the past with a low-end hardware business, I
echo Kent's thoughts. It's a horrible business to be in - slim profits
(if that) and lots of tech support.
I have a HobbyCNC board and I'm on the HobbyCNC list. The owner of that
business sells the boards unassembled to
heh I used to work for one of the UK kit suppliers and I know the
support problems only too well, glued instead of solder, random part
orientation, mains accross the tracks, my job was phone support and
fixing kits for a fixed fee.
Dave Caroline
Roland Jollivet wrote:
2008/11/21 Jon Elson [EMAIL PROTECTED]
John Kasunich wrote:
Jon Elson wrote:
John Kasunich gives an excellent response, but didn't mention
connectors.
Actually, I did, in some detail:
Agreed, you definitely did mention at least
Hi
If we look at HM2_7i43,
where can I find documentation on the actual read/write sequence to the
parallel port, and a map of the registers?
Regards
Roland Jollivet
2008/11/20 Sebastian Kuzminsky [EMAIL PROTECTED]
Roland Jollivet wrote:
Yes, I was looking at most of them, but I suppose
Roland Jollivet wrote:
Hi
If we look at HM2_7i43,
where can I find documentation on the actual read/write sequence to the
parallel port, and a map of the registers?
You could look at the source code. It's even available on the web. (at
http://cvs.linuxcnc.org/)
The HM2_7i43 is a bit more
Stephen Wille Padnos wrote:
Roland Jollivet wrote:
Hi
If we look at HM2_7i43,
where can I find documentation on the actual read/write sequence to the
parallel port, and a map of the registers?
You could look at the source code. It's even available on the web. (at
Thanks for that. Something to chew on for a few weeks..
Regards
Roland Jollivet
2008/11/21 Sebastian Kuzminsky [EMAIL PROTECTED]
Stephen Wille Padnos wrote:
Roland Jollivet wrote:
Hi
If we look at HM2_7i43,
where can I find documentation on the actual read/write sequence to the
Hi
I have been wondering the last few days on an 'open' data format for
controlling low cost, user built servo's.
The scenario of using a 'proper' closed loop servo for a small mill is very
appealing over a stepper.
While parallel ports are almost free and sufficient for steppers, to
implement
Roland Jollivet wrote:
Hi
I have been wondering the last few days on an 'open' data format for
controlling low cost, user built servo's.
Interesting project - my comments are interspersed
The scenario of using a 'proper' closed loop servo for a small mill is very
appealing over a
There are several systems along these lines that already exist:
pico-systems ppmc, mesanet.com's 7i43, and pluto_servo all use the EPP
protocol for this purpose, and each one has established its own protocol
details.
There's also this project, though I'm not sure of the state of it:
Roland Jollivet wrote...
I have been wondering the last few days on an 'open' data
format for
controlling low cost, user built servo's.
I would be interested - I have been trawling the 'net for a
while now looking for exactly this kind of project - one
that I can make myself and which won't
Thanks John
I knew you'd give a comprehensive reply.
Notwithstanding, many hobbists build their own stepper drives. There's a
plethora of them. So now now it's open loop. Otherwise cobble your own
Step/Dir drive. Got closed loop, but two of them that meet in the middle. If
you want to build your
Hi Jeff
Yes, I was looking at most of them, but I suppose the data format is not
trivial, as it's adressing FPGA's. I would also think toe's would be stepped
on if one tried to piggy-back someone elses format.
Regards
Roland Jollivet
2008/11/20 Jeff Epler [EMAIL PROTECTED]
There are several
Roland Jollivet wrote:
Yes, I was looking at most of them, but I suppose the data format is not
trivial, as it's adressing FPGA's. I would also think toe's would be stepped
on if one tried to piggy-back someone elses format.
Mesa's HostMot2 protocols and FPGA source code are all open source
There are several systems along these lines that already exist:
pico-systems ppmc, mesanet.com's 7i43, and pluto_servo all use the EPP
protocol for this purpose, and each one has established its own protocol
details.
Isn't the parallel-port going the way of the Do-Do pretty soon?
I remember
Yes, I was thinking of this too. The option is make your own PCI card. One
can get away with simple adressing, and doing away with the 'plug 'n play'
side of things. Imagine, a PCI card with dip switches!
Otherwise use a generic PCI chip like the Tiger 320 or PEX8311. The thing
is, why develop a
-users] Pic a servo
Hi Jeff
Yes, I was looking at most of them, but I suppose the data format is not
trivial, as it's adressing FPGA's. I would also think toe's would be stepped
on if one tried to piggy-back someone elses format.
Regards
Roland Jollivet
Actually at least
Roland Jollivet wrote:
Hi
I have been wondering the last few days on an 'open' data format for
controlling low cost, user built servo's.
The scenario of using a 'proper' closed loop servo for a small mill is very
appealing over a stepper.
While parallel ports are almost free and
Jon Elson wrote:
John Kasunich gives an excellent response, but didn't mention
connectors.
Actually, I did, in some detail:
There is a minimum cost for just about any electronic thing made
in small quantities. It comes from the bare PC board, cables,
connectors, bypass capacitors, and
John Kasunich wrote:
Jon Elson wrote:
John Kasunich gives an excellent response, but didn't mention
connectors.
Actually, I did, in some detail:
Agreed, you definitely did mention at least one, specifically! But, a
multi-axis servo control will have multiple connectors, and
2008/11/21 Jon Elson [EMAIL PROTECTED]
John Kasunich wrote:
Jon Elson wrote:
John Kasunich gives an excellent response, but didn't mention
connectors.
Actually, I did, in some detail:
Agreed, you definitely did mention at least one, specifically! But, a
multi-axis servo
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