Re: Mechanical Endstop
does that "whatever reason" make any sense? Is that what is burning boards? Maybe opto stops would not do this, as they are variable resistors right? A switch is a strong short...
View ArticleRe: Mechanical Endstop
Not really. The problem is that you can invert the connector (by putting in a plug that doesn't have the locking/indexing part back-to-front), and you connect VCC to the signal pin (aka the switch)....
View ArticleRe: Mechanical Endstop
I did wonder about fitting current limit into the endstop VCC pins, in a way that doesn't interfere with opto/hall switches. Would require a little more space, and suitable part. There are some 0603...
View ArticleRe: RAMPS for Due!
Hi bobc : I got one RAMPS-FD from www.geeetech.com ,and also I get a copy of schematic from github ,when I try to testing repetier-frimware and finished some code-moding ,I found that geeetch.com use...
View ArticleRe: RAMPS for Due!
V1 has the outputs inverted. This is a known issue and as such part of the reason for the redesign. Basically Geeetech jumped the gun and started selling boards for a design that was not finished.
View ArticleRe: RAMPS for Due!
Oh ...... NO ..... OK then ,I get it , I will try to fix it then .....And I found the reason too , it seem to need few modification to fix it .when I fix it down then post the result ....(:P)
View ArticleRe: RAMPS for Due!
You can remove the drive transistor and some associated components to make the circuit to the way we have it now, and it "should" be fine. I posted a bit about this earlier in this thread (read it...
View ArticleRe: RAMPS for Due!
this is why I requested that someone who knows what is going on up dates the wiki with know issues and work around.. as there is now going to be some 1000+ people with version 1A boards needing help.
View ArticleRe: RAMPS for Due!
Yeah ,that's great ! I will try it tonight . Geeetech use IRF3205 instead of IRLB8743PBF which bobc use in issueB , I checked the datasheet of two MOSFET . [attachment 25923 3205.jpg] For IRF3205 Vgs...
View ArticleRe: A faster ARM controller
I think that the short board now is printer firmware . The popular 3D printer firmwares do not support 32bit MCU well .Now only repetier and aprinter support normal coordinate , delta coordinate and...
View ArticleRe: RAMPS for Due!
You can access the v1A files via the following link RAMPS-FD Revision 1A I made some modifications to Repetier firmware to support the inverted outputs on v1A, but I never got repetier working...
View ArticleArduino's Max Stepper Freq?
What's the maximum step freq that the Mega can handle? Thanks,
View ArticleRe: Arduino's Max Stepper Freq?
It really depends on how the firmware is written, but I've seen figures of 10-30kHz claimed. Is there a background to the question, or are you just interested?
View ArticleRe: Factory firmware restore on gen6d
Before the atmega644 was working fine, I just tried to restore the factory firm. This can kill the atmega that easy? How can I make sure it is the atmega? If I connect my board to the pc, it recognize...
View ArticlePololu DRV8824 behavior vs 8825 -- what's going on here?
Hi all, I'm new to this forum, so if I'm posting in the wrong place my apologies, please point me in the right direction. I'm in the process of building a repstrap, and since getting everything put...
View ArticleRe: Pololu DRV8824 behavior vs 8825 -- what's going on here?
Check the speed limits and acceleration limits in your firmware. The default speeds in many of the firmwares are maximums for specific machines (most of the firmware people either own specific...
View ArticleRe: Pololu DRV8824 behavior vs 8825 -- what's going on here?
I've tried speeds between 6 and 300 rpm (equivalent, with my pulleys, to linear speeds of ~4 to 200 mm/s); the behavior is the same over that whole range. I tried reducing acceleration until I could...
View Articlewhat board is this
Hi All, Does anyone know what board is this (attached photo). I want to update the firmware and not sure what board I have to select in Arduino. The processor on it is ATmega64A. The intent is to use...
View ArticleRe: what board is this
It looks like it is a Gen 6 clone of some sort, considering they used the atmega644.
View ArticleRe: Pololu DRV8824 behavior vs 8825 -- what's going on here?
Interesting, I also had problems with Repetier on Allegro drivers on some moves. I suspect it is a problem with Repetier, since I don't have problems with other firmware. The fact that you say it...
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