Re: RAMPS for Due!
This seems to be a common problem reported on the Arduino Due forum. I'm not sure what the solution is though, the recommendation seems to be to use the native USB port. Of course that needs the USB...
View ArticleRe: RAMPS for Due!
I've just discovered that the serial problems only appear if the board is connected to the RAMPS-FD, it works all right alone, powered via USB. When it's connected to the RAMPS-FD, it doesn't matter...
View ArticleRe: RAMPS for Due!
I've just tried connecting a Mega with my RAMPS-FD, and it's not working. I've first flashed updated firmware with the right pin configuration, and it boots all right on its own, but as long as the...
View ArticleRe: RAMPS for Due!
I would put a volt meter on the output of the Adruino regulator. It's a long shot, but we may be pulling more current than they would like us to pull.....
View ArticleRe: Opensource PIC/ AVR bipolar stepper driver
Got TI parts in hands, looking for some proven circuits for building the driver
View ArticleRe: Opensource PIC/ AVR bipolar stepper driver
How about the parts from the TI app note / eval board?
View ArticleRe: RAMPS for Due!
I've pushed a major board layout change to bobc via github. We've gone back to driving the FETs directly out of the ESTOP drivers using 5V, (using HCT/ACT chips) for the moment. Also increased the...
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Re: RAMPS for Due!
I've made some progress in debugging my ADC errors. The symptom is easy to reproduce: whenever a heater is on, the ADC readings go up (temp readings go down), permanently, until the heater is turned...
View ArticleRe: RAMPS for Due!
Ok, so I've added another wire to my setup, from where I soldered the existing wire to GND trace (top-left end of the wire in the picture), to the GND pin on the Due board, the one next to Vin (I...
View ArticleRe: RAMPS for Due!
Quoteambrop7 I've been measuring voltage between the ground connection of the thermistors and Due's GND pins next to Vin (presumably these have the best connection to GNDANA on the SAM3X8E). I find...
View ArticleNEMA 17 Stepper Motors
Hi, I am currently building my first rep rap, and decided to go with the Prusa Mendel i3 rework. I'm having difficulties deciding witch stepper to buy. I was looking into buying this one:...
View ArticleRe: NEMA 17 Stepper Motors
That motor pulls way more current than you want to run with the a4988's. Something more like: [www.makerfarm.com] make a better match to the 4988's in an i3. They also are cheeper than the ones from...
View ArticleRe: RAMPS for Due!
Giving the thermistors a dedicated ground and returning it via a dedicated pin to the Due probably is the only real way to get good resolution on the thermistors. A work around would be to send the...
View ArticleI broke the micro-USB header off, can I use the JY-MCU instead?
So I broke off the micro-USB header a while back, and I did repair it. It worked for a month or so but now it has failed again. Sure I'll attempt to re-melt the solder on the pins, but I was wondering...
View ArticleRe: RAMPS for Due!
@Cefiar I can't try the wire connection at the moment since I'm lacking a soldering iron, but I don't think it will do much. Let me emphasize that the parasitic voltage only appears when heaters are...
View ArticleRe: RAMPS for Due!
Here's a simple way to reduce these sorts of issues: Your power supply needs a ground reference. Running it without a ground is not safe. (note to self ... ground the supply on the printer ...do as I...
View ArticleRe: RAMPS for Due!
USB ground loops like this explain all the issues, but this also adds to the fact that the ground connections were way too thin in many areas. That said, eliminating the ground loop issues is not...
View ArticleRe: I broke the micro-USB header off, can I use the JY-MCU instead?
It turns out that the + on the micro USB header was loose. I was able to just heat up the pin with my soldering iron, and get it stuck on again. I also did pin the USB cable in there with a zip tie,...
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Re: RAMPS for Due!
My PC and printer PSU are plugged into the same extension cord, they certainly both have a ground connection. And this is actually the issue, because the resistance of the ground connections is low...
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