Looking for micro controller based barn door tracker URL

Recently I stumbled on a web page for a barn door tracker that was
driven by a micro controller in order to provide a variable drive
rate. Unfortunately I forgot to bookmark it and now after searching
with Google and looking through other barn door and ATM sites I still
can't find it.

I remember that the drive screw went through two delrin rods (one of
which was threaded and the other was the motor mount) in order to
provide pivots at both ends of the drive screw. The delrin rods were
in aluminum blocks with slotted screw holes so that the position of
the bearings on the boards could be adjusted to the correct distance
from the hinge. There was a switch that let the micro controller
recognize when the boards were in the closed position before the start
of a tracking session. All of the fabrication work was very nicely
done.

Does this sound familiar to anyone?

--
Brian Reynolds | "But in the new approach, as you know,
| the important thing is to understand
http://www.panix.com/~reynolds/ | what you're doing rather than to get
NAR# 54438 | the right answer." -- Tom Lehrer

Here's one based on the 8051
http://www.keteu.org/~haunma/proj/barndoor/
Dave

"Brian Reynolds" wrote in message
...

Recently I stumbled on a web page for a barn door tracker that was
driven by a micro controller in order to provide a variable drive
rate. Unfortunately I forgot to bookmark it and now after searching
with Google and looking through other barn door and ATM sites I still
can't find it.

I remember that the drive screw went through two delrin rods (one of
which was threaded and the other was the motor mount) in order to
provide pivots at both ends of the drive screw. The delrin rods were
in aluminum blocks with slotted screw holes so that the position of
the bearings on the boards could be adjusted to the correct distance
from the hinge. There was a switch that let the micro controller
recognize when the boards were in the closed position before the start
of a tracking session. All of the fabrication work was very nicely
done.

Does this sound familiar to anyone?

--
Brian Reynolds | "But in the new approach, as you know,
| the important thing is to understand
http://www.panix.com/~reynolds/ | what you're doing rather than to get
NAR# 54438 | the right answer." -- Tom Lehrer

In article ,
Dave Rose wrote:
"Brian Reynolds" wrote in message
...
Does this sound familiar to anyone?

Here's one based on the 8051
http://www.keteu.org/~haunma/proj/barndoor/

I saw that one last night while looking for the one I remember. The
one I saw (and lost) had photographs online of all the details.

--
Brian Reynolds | "But in the new approach, as you know,
| the important thing is to understand
http://www.panix.com/~reynolds/ | what you're doing rather than to get
NAR# 54438 | the right answer." -- Tom Lehrer

In article ,
Dave Rose wrote:
"Brian Reynolds" wrote in message
...
Does this sound familiar to anyone?

Here's one based on the 8051
http://www.keteu.org/~haunma/proj/barndoor/

I saw that one last night while looking for the one I remember. The
one I saw (and lost) had photographs online of all the details.

--
Brian Reynolds | "But in the new approach, as you know,
| the important thing is to understand
http://www.panix.com/~reynolds/ | what you're doing rather than to get
NAR# 54438 | the right answer." -- Tom Lehrer

In article ,
Dave Rose wrote:
"Brian Reynolds" wrote in message
...
Does this sound familiar to anyone?

Here's one based on the 8051
http://www.keteu.org/~haunma/proj/barndoor/

I saw that one last night while looking for the one I remember. The
one I saw (and lost) had photographs online of all the details.

--
Brian Reynolds | "But in the new approach, as you know,
| the important thing is to understand
http://www.panix.com/~reynolds/ | what you're doing rather than to get
NAR# 54438 | the right answer." -- Tom Lehrer

Here's one based on the 8051
http://www.keteu.org/~haunma/proj/barndoor/
Dave

"Brian Reynolds" wrote in message
...

Recently I stumbled on a web page for a barn door tracker that was
driven by a micro controller in order to provide a variable drive
rate. Unfortunately I forgot to bookmark it and now after searching
with Google and looking through other barn door and ATM sites I still
can't find it.

I remember that the drive screw went through two delrin rods (one of
which was threaded and the other was the motor mount) in order to
provide pivots at both ends of the drive screw. The delrin rods were
in aluminum blocks with slotted screw holes so that the position of
the bearings on the boards could be adjusted to the correct distance
from the hinge. There was a switch that let the micro controller
recognize when the boards were in the closed position before the start
of a tracking session. All of the fabrication work was very nicely
done.

Does this sound familiar to anyone?

--
Brian Reynolds | "But in the new approach, as you know,
| the important thing is to understand
http://www.panix.com/~reynolds/ | what you're doing rather than to get
NAR# 54438 | the right answer." -- Tom Lehrer

Here's one based on the 8051
http://www.keteu.org/~haunma/proj/barndoor/
Dave

"Brian Reynolds" wrote in message
...

Recently I stumbled on a web page for a barn door tracker that was
driven by a micro controller in order to provide a variable drive
rate. Unfortunately I forgot to bookmark it and now after searching
with Google and looking through other barn door and ATM sites I still
can't find it.

I remember that the drive screw went through two delrin rods (one of
which was threaded and the other was the motor mount) in order to
provide pivots at both ends of the drive screw. The delrin rods were
in aluminum blocks with slotted screw holes so that the position of
the bearings on the boards could be adjusted to the correct distance
from the hinge. There was a switch that let the micro controller
recognize when the boards were in the closed position before the start
of a tracking session. All of the fabrication work was very nicely
done.

Does this sound familiar to anyone?

--
Brian Reynolds | "But in the new approach, as you know,
| the important thing is to understand
http://www.panix.com/~reynolds/ | what you're doing rather than to get
NAR# 54438 | the right answer." -- Tom Lehrer

On 30 Jan 2004 01:20:34 -0500, (Brian Reynolds) wrote:

Recently I stumbled on a web page for a barn door tracker that was
driven by a micro controller in order to provide a variable drive
rate...

This one? http://www.cloudbait.com/projects/barndoor.html


_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

In article ,
Chris L Peterson wrote:
On 30 Jan 2004 01:20:34 -0500, (Brian Reynolds) wrote:

Recently I stumbled on a web page for a barn door tracker that was
driven by a micro controller in order to provide a variable drive
rate...

This one? http://www.cloudbait.com/projects/barndoor.html

Yes that's the one. Thank you! It was driving me nuts not to find
it. I have your web page bookmarked, but didn't associate a barn door
tracker with it.

By the way, has anyone built a barn door with a rotary encoder (like
those used in DSCs) to drive the motor based on actual angular
velocity rather than by using a table to drive the motor based on a
known starting position?

--
Brian Reynolds | "But in the new approach, as you know,
| the important thing is to understand
http://www.panix.com/~reynolds/ | what you're doing rather than to get
NAR# 54438 | the right answer." -- Tom Lehrer

In article ,
Chris L Peterson wrote:
On 30 Jan 2004 01:20:34 -0500, (Brian Reynolds) wrote:

Recently I stumbled on a web page for a barn door tracker that was
driven by a micro controller in order to provide a variable drive
rate...

This one? http://www.cloudbait.com/projects/barndoor.html

Yes that's the one. Thank you! It was driving me nuts not to find
it. I have your web page bookmarked, but didn't associate a barn door
tracker with it.

By the way, has anyone built a barn door with a rotary encoder (like
those used in DSCs) to drive the motor based on actual angular
velocity rather than by using a table to drive the motor based on a
known starting position?

--
Brian Reynolds | "But in the new approach, as you know,
| the important thing is to understand
http://www.panix.com/~reynolds/ | what you're doing rather than to get
NAR# 54438 | the right answer." -- Tom Lehrer