Re: RAMPS for Due!
I have finished testing , yeah! the borad seem working good with bobc ' firmware .After compare IRF3205 and IRBL8743 .Maybe add a 74hc04 in order to invert the logic level is a good idea .
View ArticleRe: Pololu DRV8824 behavior vs 8825 -- what's going on here?
Ah, that makes sense! I haven't tried changing the firmware because I thought I had it narrowed down to a problem with the hardware. But if the Repetier firmware is sending signals that are...
View ArticleRe: what board is this
Have you tried a M115: Get Firmware Version and Capabilities ? See if tells you anything. If you cant find the board specs uploading new firmware is never going to work... you will need to trace every...
View ArticleRe: Megatronics v2 problems
I have the same issue with the heated bed controller... just put in line with an ammeter and is pulling 5.66A which is right for 11.8 volts to the FET and 2.0 ohms for the bed but its liquifying the...
View ArticleRe: Megatronics v2 problems
My 5V reg is also an issue, its putting out 4.08 Volts only so could be faulty..
View ArticleRe: Megatronics v2 problems
The mosfet shouldn't get hot when the heatbed is off, since there is no current flowing, so that is a puzzle. :S It's possible to overheat the mosfet if you have PWM turned on for the heatbed, check...
View ArticleRe: Replicape, a BeagleBone 3D-printer cape, is ready for pre-order
With fear of being blamed for necromancy, I'm adding a link to a video of Replicape working on an old MakerBot Cupcake: [www.youtube.com]
View ArticlePin assignments and arduino ports
I got bored last night and started to look at the port assignments of the various 2560 board iterations (RAMPS, RUMBA, RAMBO, MEGATRONICS). Some boards group specific functional pins together on a...
View ArticleRe: Pin assignments and arduino ports
I would personally try and stick to all XYZ steps are on the one port if possible, as most firmware use bitwise operations for control. This would ensure that any X/Y/Z steps (or whatever it works out...
View ArticleRe: Pin assignments and arduino ports
So based on this, can we say that boards that perform port grouping for critical signals have an edge in terms of performance? If so then the RAMBo should have a performance edge over the other...
View ArticleEndstops not working on Sanguish
I have a Sanguish board, two actually, and on one the opto-endstops work fine. They didn't start off that way but for whatever reason they started working. Anyway, this other board none of the...
View ArticleRe: Pin assignments and arduino ports
Depends entirely on the code as to how well they take advantage of it. If the code doesn't move the extruders at the same time as the axes (ie: if there is some other code in between), then it's not...
View ArticleRe: RAMPS for Due!
I am working on making a version of this board for the BeagleBone (Cape-RAMPS, or CRAMPS), and am somewhat limited on pins (the BeagleBone Black looses a lot of I/O if you want to use the on-board...
View ArticleRe: RAMPS for Due!
Initially I tried to keep things similar to RAMPS, then realized they were too many differences (e.g. 3.3V vs 5V, SPI on different pins, etc) so just assigned unused IO to connectors as convenient. I...
View ArticleRe: RAMPS for Due!
Thanks Bob! I can keep the SPI header, and I'm trying to keep the BOM as similar as possible (hoping that someone who's building the RAMPS-FD might build a few of the BeagleBone version to see if they...
View ArticleRe: Megatronics v2 problems
Have bang bang set but continues to get dangerously hot (what temp does solder melt at?). I wonder if its a cheap or faulty FET, since my 5V reg is only putting out 4V could it be over-amping the FET...
View ArticleRe: Megatronics v2 problems
I wouldn't worry about solder melting at anything under 165 deg C, and higher is the usual norm (especially if it's not leaded solder). Lead/tin solder in either 63/37 or 60/40 should start to melt at...
View ArticleRe: RAMPS for Due!
Another question: I notice the LEDs for the high-current MOSFETS are driven by +5V instead of +V_POWER, and I'm wondering why. Typcical LEDs have very low reverse voltage ratings (it's 5V for the...
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