Re: Firmware not working on delta-pi with RAMPS 1.4 and mega 2560
Hi, I tried something similar to what you describe, but my display still refused to work. In the end I got some spare parts and started replacing parts. I then quickly found out the RAMPS was faulty....
View ArticleRe: My little ARM board
Mallgan: I don't think bobc would mind too much (it is OHW after all), but only he can say for sure. I've not heard from him lately though, which is slightly worrying. Last commit to his github was on...
View ArticleRe: My little ARM board
QuoteCefiarTramflug: If you want anything resembling accurate temp out of a thermistor, then yes. OK, so poorly designed electronics are apparently standard and accpeted. Has nothing to do with the...
View ArticleCalibrating different stepper drivers
Hi, I've just about finished my Prusa i3 build and the Z axis steppers seem to need a little more juice when they did in my Prusa i1. In the past I just slowly turned the pot until it no longer had...
View ArticleRe: Calibrating different stepper drivers
Allegro site would have datasheets for each chip and datasheet will give a relation between Vref pin and I(peak) and Rs, where Rs is the sense resistors used on the board. The boards could have...
View ArticleRe: Calibrating different stepper drivers
Also as a note, all those do have Vref, where on the IC driver Vref is an input pin that takes in a voltage set by external components. Usually should be a potentiometer for the purpose to allow to...
View ArticleRe: Calibrating different stepper drivers
On the boards without the vref point it can be taken from the pot correct? You just answered this. Also is there an easy way to identify the Rs on the board? The information for the calculation seems...
View ArticleRe: Calibrating different stepper drivers
QuoteJoeDaStudd On the boards without the vref point it can be taken from the pot correct? This is where its nice to be in open source environment, if you can locate sources for what you have and you...
View ArticleShould the I/O pins be current protected?
I am building a Mendel Prusa along with the middle school kids from our Robotics group. We have been having some issues with the Sanguinololu v1.3 board design and have fried the 1284p in the process....
View ArticleRe: 160mm diameter round PCB HBP?
Hi Dust, It can be easily designed using EAGLE CAD user script named 'spiral-coil.ulp'. The script draws 180 degree arcs that radius gradually increased from the center toward the outside. And, you...
View ArticleRe: Should the I/O pins be current protected?
If the uC still work and the drivers also work, and only that pin is stuck at 5v, maybe there is in code somewhere to make it high and hence stays at 5v. Do a full chip erase and try some a single...
View ArticleATX supply to power RPi / RAMPS / OctoPi
I've done quite a bit of googling and think I have this figured out, but I would like someone to double check me. The Goal: Use an ATX power supply to provide 5v standby to power a Raspberry Pi which...
View ArticleRe: ATX supply to power RPi / RAMPS / OctoPi
1) The 5v standby rating should be on a label on the psu, and bigger than the consumption of the stack both rpi and arduino together, and their ratings will be on their specifications, but that would...
View ArticleRe: ATX supply to power RPi / RAMPS / OctoPi
Thanks for the detailed answers. I really appreciate it. As for my question about the 5v load, I found this on the reprap wiki... not sure how I missed it before. QuoteMany PC PSUs (not all) require a...
View ArticleRe: ATX supply to power RPi / RAMPS / OctoPi
I'm really interested in this. Its something I've been thinking about doing for a while, but never got around to it. I got a little lost in all the extras you could add to the setup, for some reason...
View ArticleRe: ATX supply to power RPi / RAMPS / OctoPi
How are you going to power the Arduino before you turn the power supply on? Via USB from the RPi? I think you'll have issues as the RPi doesn't have much current capabilities via it's USB port,...
View ArticleAxis Calibration
Hello guys I am working on a Rostock 3D-printer with my partner. We have already built the printer but now we do have some problems with the firmware. We are using Arduino 0023 and as Firmware we...
View ArticleRe: ATX supply to power RPi / RAMPS / OctoPi
I am planning on powering the Arduino from the RPi with USB. I'm actually doing that right now with a 2A wall wart powering the RPi and USB to the Arduino/RAMPS stack. Haven't run into any problems...
View ArticleBAM&DICE an new RAMPS compatible electronics
We just started our Indiegogo campaign for BMA&DICE a new, RAMPS compatible, electronics. This electronic, supports much powerful stepperdrivers and also allows to plug in many more different...
View ArticleRe: ATX supply to power RPi / RAMPS / OctoPi
About D1, if the 12v is supplied the diode become forward biased and conducts to mega regulator input pin, so that regulator can make 5v from the 12v supply instead. Nothing wrong with that, if you...
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