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Seems like this thread came back from the dead.
I started to implement some of this a few years back in assembly. The Teacup solution seemed to have more support so I have not done much. Still need to order threaded rod and machine the supports, but that is another subject.
Most of my projects use a small microkernal. This is necessary when working with MIDI. To implement a simple task han
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sheep
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Firmware - experimental, borrowed, and future
Sadly I can not look at the code in the quoted article as it requires an eeTimes registration.
I finally got the gen 1.2 or whatever stepper controllers built. Testing them with an indexer. Next up is to figure out what I want to run on the Gen3 mega644. Thought it might be fun to play with this, but not if the code is not open and hidden behind an email grabber registration page.
Can the e
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sheep
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Firmware - experimental, borrowed, and future
Aluminum oxide is sapphire and ruby (when doped) It is really hard and can be brittle. The chips work well as sandpaper though. Semi-precious gems too. Also useful for watch bearings.
Do not know why it would be better than FR-4. Glass is silicon di-oxide, the fibers are used to make fiberglass, so there is not really that much advantage of an alternative.
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sheep
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General
Triffid_Hunter Wrote:
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> yes teacup has preliminary SD support in the
> 'sdcard' branch. I'm waiting for a mega to arrive
> so I can actually test it- can't fit both teacup
> and the SDFAT libraries onto my '328!
>
What libraries are you using?
How much space does teacup currently use? This is straight C, Right?
Petite FAT
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sheep
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Firmware - experimental, borrowed, and future
Clicked on this 'cause I saw a May 24th date. Only to realize it is year old.
Thread necromancy waves fingers. Oooky spooky music in the background. As the sorcerer in best Gilbert and Sulivan traditions cries arise o' thread arise...
So what have I accomplished in a year? Mostly traditional player piano and band organ work. Not a lot of folk who do this anymore.
I did however do a lot m
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sheep
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Firmware - experimental, borrowed, and future
I just posted a long reply in the other thread, that got moved. Do not know where it went so here it is again. Not sure what happens when posting as a thread moves.
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As said there I was surprised not to find the group as in years past. I will admit, I went steampunk myself, something I have done since 1984 or so at science fiction conventions. Guess I was Tier 1 this year, or perhaps
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sheep
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General
I have been rather busy as of late, but was surprised to see no rep-rap presence at the fair this year. Must have missed where folk decided it was not worth it. This was my first time not tied to a group. Could do the steampunk outfit thing and cart my crank organ about with me.
The commercial suppliers were there, but spread about the buildings Not all in one place. Much of the fair has s
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sheep
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General
For those of us with a number of old ppc Macs that run Tiger, I found that the "Mac ports" work just fine and allow the newer java and python builds to install and be used by skienforge etc. This way one only needs to configure the X11 shell to launch.
If one really wants to use the host software, Installing and running from the "Netbeans" IDE works after a fashion. I never could get the host
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sheep
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General
I wrote some assembly code that tests the reader. An early version of this is on github. It has been a wile since I have had time to work on this. As I recall I registered under the name sheep on that site too.
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sheep
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General
I have been on the Z-corp mailing list for some time. Occasionally they offer free seminars. Some folk here might be interested in actually seeing one of these powder printing devices operate.
Link to Z-corp page
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sheep
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General
1. Drill hole
2. place wire through hole
3. solder wire on each side
This does not work for wires that are under the electronic parts. These wires are called vias.
Commercial method -- requires something called "conductive ink"
1 Drill hole
2 paint inside of hole with "conductive ink" so ink flows through hole.
3 electroplate board so "metal" sticks to the inside of the hole
4 mask off parts
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sheep
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Controllers
Something I have meant to share since last spring. When I attended the embedded conference, I got to talking with one of the ATMEL reps about the reprap projects and stepper and servo control.
One suggestion that he has was to use several of the inexpensive usb enabled digital calipers, which could be used to supply real time feedback from the table position. Clamp one side of the caliper to
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sheep
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General
Search my posting history. I had some left over PCB and toner transfer paper, which I used to make a USB cable from the arduino layout. My experience with home etching has been mixed. This is something I have done off and on for over 30 years. Usually I find the toner does not stick to the edges. Better results from photo etching, but the overhead is a lot more and the chemicals are nasty.
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sheep
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Controllers
The photograph makes it look like the green FR-4 substrate is where the pad should be.
From looking at the online documentation that these are power filter capacitors. So you should be able to get one with leads and connect it between ground and power. These are placed close to the connector to be effective.
I am not using this board in my setup (a mix of Gen 2 stepper drivers and the G
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sheep
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Controllers
Hopefully the trace pad did not lift from the board. If that happened then you would need to run a wire back to the common point.
Typically with these I use two irons. Since one side is already off then you can heat the other and remove the cap.
Testing a cap requires an analog volt meter with a needle. Set the volt meter to the resistance scale. This works as there is an internal battery
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sheep
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Controllers
Is there a way to change the skin preference back to the wide blue one? Most boards seem to allow the user to choose what skin looks best. I looked in my prefs pane, but this does not seem to be an option for skin preference.
Also noticed a lot more spam lately ...
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sheep
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Administration, Announcements, Policy
Quotetv7957ht Wrote:
>
> anyone can advise best way how to re-life a chip ?
Ideal way is to use High voltage parallel programming (HVPP) an STK500 or a dragon is needed.
Alternate way is to inject a slow clock source (1/4) the target frequency onto the osc pin. This fixes chips which have had the oscillator fused from internal to external. Sometimes all that is needed is to lower the p
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sheep
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Firmware - mainstream and related support
It does not look like the techzone remix version supports ATX connectivity.
The PDF implies power comes in from the USB to RS232 header. You could also inject 5V only to either the JTAG header or the ISP header.
To use an ATX supply one would need to remove the 3.3v regulator (as this is generated more efficiently on the ATX supply. Also needed would be a load resistor and a switch for tu
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sheep
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Controllers
That is the JTAG header NOT the I2C header.
JTAG is used for program debugging. This is not used on the Sanguino as this port is also used the X axis. Enabling JTAG would cause the axis to not work.
The signals you need for USB connectivity are called RX, TX, DSR, RTS.
The I2C (TWI) signal names are
SDA -- serial data
SCL -- serial clock
These signals are also multiplexed with other pins.
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sheep
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Controllers
You need a device called a "Wheel Puller." I had a machinist friend take the gear off when he knurled my motor.
Larger versions are sold by auto parts dealers. For a Nema-17 the puller is fairly small.
Usually there are 3 adjustable clamp arms which grip the underside of the wheel or gear to remove. In the center is a screw that contacts with the shaft. By tightening the screw the arms close
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sheep
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Mechanics
Actually there is a lot on unipolar steppers. These are really easy to bit bang. No H-Bridge is used, so fewer failure modes. Most drivers just use a current limiting resistor on the supply.
As far as I know, micro-stepping and current control does not work as well in unipolar mode. I think one can half step. The drivers I have seem to exhibit a resonance point which limits the useful sp
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sheep
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Stepper Motors, Servo Motors, DC Motors
There is an open source discreet design that is part of the EMC2 project. Look-up LinuxCNC forum archives using your favorite search tool
Also note: there is a dedicated sub forum for stepper related issues, where I asked this very question a few months ago.
-julie
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sheep
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Controllers
Quotejgilmore "There's a find function on the MAC too, but I know even less about MACs than I do about windows."
Mac is just a GUI on top of UNIX. So grep should work. To access the UNIX shell use applications->utilities->terminal. This will open a small window with a bourn shell. One does have to be a bit careful on the mac as the GUI is picky about what version of library is used
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sheep
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Controllers
Amforth looks really promising.
This may be just the sort of interpreter that is not seen as to complex for the entry level user.
A board like the Butterfly is the best sort term solution to making the electronics easier and more accessible to the average user. Now if someone would make a stable Arduino branch for the Butterfly ...
Would that I had more time to play with amforth. Probably b
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sheep
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Firmware - experimental, borrowed, and future
TC Wrote:
QuoteTC
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> Julie - I always appreciate feeback, pro or con.
> That doesn't mean that I always agree with it
> however. Here are some specific points that I
> don't agree with you on:
Not really a problem. I am pretty selfish about opinions. You can not have any of mine.
Note that I am not answering one person. I susp
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sheep
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Controllers
Google LM983x. This is an integrated flat bed scan controller ASIC. One of the few that is documented.
A flat bed scanner is better than a printer. Printer ASICs are somewhat similar. I have never seen a printer ASIC documented, then I have never looked for such. Most mfgs keep this pretty close in hand. The units are loss leaders for selling distilled water and some really high proof alc
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sheep
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General
Ooh thread necromancy.
One really does not know what to do when dead threads go zombie?
The thread is dead, the thread is read. viva la thread mortuordum.
-julie
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sheep
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General
QuoteTC
2) Re-design the existing electronics onto a single RepRap Mendel specific PCB. Making a single board is the most cost effective and fool-proof way of getting working Mendel electronics. Having this board manufactured and offered as an assembled, tested and documented PCB would lower the adoption hurdle for the most people. While minor improvements can be made on this iteration major new
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sheep
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Controllers
Quoteannodomini2
> Hence my suggestion of a configurable system, no
> need for a user to do this, if someone wants to
> hack and/or modify a system it's upto them
>
How do you propose this? Inch vs metric. How to set the diameter of the extrusion? Where are the home and clean tool positions?
Does the user download setup files. Or are there switches, which are either rotary or l
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sheep
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Controllers
Recently there has been a lot of traffic on the electronics side relating to moving over to some sort of ARM processor with a shield similar to the Arduino.
I wrote a long reply, which probably relates more to the firmware and the how much time it takes to write code.
A month or two ago I set out to make my own firmware using AVR. Mostly because I needed to solve the issue reading SD cards.
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sheep
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Firmware - experimental, borrowed, and future
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