The RRD smart controller uses a ST7920 display in SPI mode, so look for an example using that. The ST7920 has some quirks, the CS line is active high and the SPI bus can not be shared, so you might need to use software SPI. Otherwise, printer firmware use the standard u8glib software.by bobc - General
With RAMPS 1.4 now selling for as low as $5 incl shipping, I think it is a pretty interesting mod. Did anyone put together a web page describing the mods? If not I might do that. I am just doing a KiCad version of RAMPS 1.4.2, so could also do a schematic for a 3.3V version.by bobc - RAMPS Electronics
Flowcharts are a thing of the past, I rarely see them nowadays. Professional code might use UML or other modelling diagrams. Most public projects just use the source. The theory is that code written in a high level language should be self explanatory, and that is mostly true. The timing relationship is usually done with the Bresenham algorithm, though you don't say what firmware you are lookingby bobc - Developers
That PSU is designed to have air flow through it, not a bolt on heatsink, so I would certainly say it is most likely to be a heat issue. The other possibility is a short circuit on the heatbed, but that would cause a shutdown as soon as you switch the heatbed on.by bobc - Controllers
Digikey sell themby bobc - Controllers
I am still doing some finishing on v2.2, I redid the routing completely, I might be able to publish something soon. For the EV board, I hadn't quite round to the display interface, I was planning to implement something with a single connector dedicated to a display, possibly similar to RADDS.by bobc - Controllers
Removing chips without special equipment is really easy with ChipQuik. It's a low-temp alloy, so you don't overheat the board.by bobc - Duet
The UK law allows folding knives with a non-locking bladed edge less than 3 inches to be carried in public places, although there are several other specific types of knife (e.g. flick or disguised) that are specifically prohibited. Otherwise you need a "good reason" to be carrying a knife in public (which includes being in the boot of your car). Police are likely to charge you anyway and let theby bobc - General
There was never a gun The police quickly realised they had made a massive cock up, but of course they are not going to admit that.by bobc - General
QuoteDust Gen 7 is meant to be home made, make your own PCB, solder it up etc Is totally open source No, it's not Open Source, it does not use an Open Source license. It might be considered open source by the Reprap administrator, who also happens to be the designer of Gen7.by bobc - Controllers
Because this is a common problem, there are solutions ready to buy! This page describes the exact scenario "Electromechanical brake type used for vertical operation" There are stepper motors with builtin electromechanical brake, and you can also get braking units. Whether off the shelf or DIY, the principle is the same as Dust describes.by bobc - Stepper Motors, Servo Motors, DC Motors
Interesting! There was always talk about doing this so it's good to see someone has finally done it. My thoughts are how much faster would it be if running on a 32 bit platform, I might look into that.by bobc - Firmware - experimental, borrowed, and future
Which license? Prusa i3 is GPL, you can sell that without problem. The "P3 steel" variants appear to be CC BY-NC 3.0, so I would contact the designer to see how they feel about it. Legally, you don't need permission to make it, but you might attract a very bad reputation. The CC BY-NC license is about the worst thing that has happened to Open Source Hardware. It's not Open Source, doesn't applby bobc - General
Quotesullivnc This power stage, the MSD Mini Powerpack 172-140, outputs a constant 140V DC In fact it doesn't, it will supply up to 140V, but less if the current limit is reached. Your motor will run fine with a current limit set at 10A.by bobc - Stepper Motors, Servo Motors, DC Motors
Use a mechanical brake.by bobc - Stepper Motors, Servo Motors, DC Motors
I am not sure who is claiming RADDS is Open Source, even by the relaxed standards of RepRap it is not considered open . There is no mention of Open Source on From a legal point of view, you don't need permission to copy the RADDS design, as utility hardware is not covered by copyright. Practically, if you want to etch a board at home, you would need to ask the authors for a copy of the board fby bobc - Controllers
The X motor placement is a bit questionable, but otherwise it appears quite solid, and if you believe some of the reports on the web, works very well. With linear rails and acme screws, it is the sort of cheap design you would do if you had access to Shenzen supply chain rather than local hardware store. At €250, it is almost tempting to buy one to replace my aging "workhorse" printer rather thaby bobc - General
Quoteipcalit The biggest issue would be interfacing with the controller and typical 8bit controllers might have a hard time counting the steps. I didn't hear anything yet from any Smoothieboard experts regarding the use of the hardware QEI feature of the LPC17xx. I had a look at the schematic here and P1[20] is connected to LED3, and P1[23] is spare, both are routed to headers. Might need to sby bobc - General
The fact the PSU fan span up obviously suggests a short somewhere. The "hot chip" is the Ethernet chip (Microchip KSZ8081 PHY), the other component that appears to be fairly hot is the 3v3 regulator. This suggests the short is in the ethernet chip. Also consistent with Ethernet working and odd behaviour from overloaded 3v3 rail. I can't really see that anything you plugged in could have causedby bobc - General
According to the spec, G0 is a rapid move and G1 is a coordinated linear move . How these are handled varies by firmware, some treat G0 the same as G1, some don't. The way Teacup handles G0 is to ignore the F parameter, and set feedrate to MAXIMUM_FEEDRATE_X * 2. If your slicer generates G0 for travel moves when not extruding, it could be that the high feedrate is causing the motor to stall.by bobc - General
Investing in a new technology project is risky, investing in an inexperienced business team is also risky. Professional investors (or smart amateurs) understand these risks, which is why they might ask for a significant chunk of equity. They know that 90% of their investments will fail, but the 10% that succeed are the payoff. I've worked for billion dollar companies, and they can easily screw uby bobc - General
Wow, I didn't expect anyone to be so blatant, to the point of risking jail time for fraud. A shame, because Peachy was something different and quite promising.by bobc - General
Wow, that is scary fast! I'd like something like that for the pick and place machine I am building.by bobc - General
I dunno, I think it is either spam or very badly targeted question about courseworkby bobc - General
Quotehakuxtr I want to use physically embed a RAMPS and arduino board and dont use any firmware. i will write my code. i will using only boards. So i can freely use this boards on my commercial product. Did i get right? Yes, absolutely. You could engage a lawyer, but I think that would be an unnecessary expense in this case. You could also consult the people who wrote the license, they haveby bobc - General
Well, I have acquired about 2000 relays for free, so I am looking for something to do with them On the subject of retro sci-fi, I recent read Valis by Philip K Dick, and while previously I was an atheist, I am now becoming convinced by "Horselover Fat" that the Universe was indeed created by a deity, but an insane one. That actually explains the nature of the Universe much better. I also undersby bobc - Developers
Hmm, if you wire 3 fans in series you'll get about 8V each, which should be enough to run the fans at a slower speed. Or run two in series. Otherwise buy a cheap 24V to 12V converter off ebay.by bobc - RAMPS Electronics
If you want to physically embed a RAMPS board in a commercial product, then there is no need for you to disclose anything, in that respect it's the same as using an Arduino in a product. If you create a RAMPS design, and use a modified version in your product, then legally there is also no requirement for you to disclose anything. GPL is a copyright license, generally speaking hardware is not coby bobc - General
The price model for printers is nuts, a set of genuine toner cartridges for my color laser is nearly as much as buying a printer. Obviously I'll buy cheap refills and hope for the bestby bobc - General
I have made a few more improvements, which I'm calling v2.2: I've added a 5V regulator, reduced some component sizes. Size expanded to 100x100mm, and layout improved to provide better access and labelling around jumpers and connectors. Connector and jumper pin functions should be same as before. The board is slightly more tricky to assemble by hand, 0603 and TSSOP require a little more care, bby bobc - Controllers