New ARM Controller Board June 21, 2015 10:12AM |
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Re: New ARM Controller Board June 21, 2015 10:23AM |
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Re: New ARM Controller Board June 21, 2015 12:32PM |
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Re: New ARM Controller Board June 21, 2015 12:34PM |
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Re: New ARM Controller Board June 21, 2015 12:44PM |
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Re: New ARM Controller Board June 21, 2015 12:46PM |
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Re: New ARM Controller Board June 21, 2015 04:56PM |
Registered: 11 years ago Posts: 126 |
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jebba
What license is the hardware under?
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VDX
... I'm using the Discovery boards for CNC-milling, laser-engraving and a XY-servo-scanner (not galvos!), but the firmware and used CAD/CAM-software isn't free or OS, so didn't post about here.
But the developer company is now changing/updating (could be because of me) for faster CPU's - the next one will be based on a BeagleBoneBlack ...
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arthurwolf
This looks like you are departing from G-code as the communication protocol, what is pushing you to do that ?
Re: New ARM Controller Board June 21, 2015 06:22PM |
Registered: 13 years ago Posts: 6 |
Re: New ARM Controller Board June 21, 2015 07:24PM |
Registered: 11 years ago Posts: 126 |
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matt.minuti
This looks pretty good, overall. A lot like what I was going to do. Glad to see someone else going for it!
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matt.minuti
If you moved upfrom the 405 to the 407, which has a budgetary cost of about $0.50 more, you'd have the ability to add ethernet at a later time. The LAN8710A or 8720A PHY is pretty cheap, and I'm sure there's chinese equivalents for even less. All you need after that is a magjack and you're good to go. Since a lot of people have previously expressed interest in not needing an rpi or whatever and just plugging in, it might be worth keeping in mind. That said, those ESP8266 wifi modules might be cheaper and more convenient for a lot of people.
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matt.minuti
I'm very glad to see higher-voltage steppers - faster movement and less heat. The chip you found looks awesome. Is there a reason for having the steppers be modules rather than integrated into the same PCB? Heat? Ability to use less beefy stepper drivers if desired?
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matt.minuti
If the stepper modules are going to stick out perpendicular to the main board (which can be nice for heat flow), you might want to consider a card edge connector. Some of them are really cheap, like the FCI 10018784-10200TLF, which is only $0.16@1k, compared to the one you picked out which is almost twice as much. That one is rated for lower current, but it has nearly twice as many pins in roughly the same space, and your stepper board wouldn't need a separate connector, saving parts and assembly cost for each stepper board, especially if there's no through-hole parts.
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matt.minuti
How do you plan to talk to those stepper chips via SPI? It seems like if a module is plugged in, you can't talk to any later ones, which rules out reading the current in use on anything but stepper 0.
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matt.minuti
Thermocouple: looks like you picked the J-type chip, but the K-type connectors. I'd choose K, because they're cheaper and better suited to the temperature ranges we're looking at. Also, are you planning to always populate the thermocouple circuitry, or just have it there as an option (like my ethernet suggestion above)? I ask because that chip alone seems to be around $3-4 at quantity, and a proper thermocouple connector isn't insignificant either. The expansion port has SPI2 on it, and I get the impression most printers don't use thermocouples, so a thermocouple board could be an add-on. People who use two heads and thermocouples would need to add a second thermocouple anyways, so it would be good to think about that use case. Thermistor circuitry is cheap and tiny, so it makes sense to have a lot of channels available, like you do.
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matt.minuti
Maybe it's just because they're cool and under $0.10/ea at quantity, but you could consider the WS2812B in place of the red, green, and blue leds on PE10,12,15. It'd free up two pins which might make the routing easier. That said, there's something nice about dedicated indicators with silkscreen labels like "POWER."
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matt.minuti
I did end up making a design for an L6474-based stepper module, as a drop-in replacement for the standard pololu. Never got around to getting it made. Would it be helpful if I ordered some to verify, and share the design?
Re: New ARM Controller Board June 24, 2015 04:53PM |
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Re: New ARM Controller Board August 08, 2015 06:25PM |
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Re: New ARM Controller Board October 18, 2015 02:34PM |
Registered: 11 years ago Posts: 126 |
Re: New ARM Controller Board December 07, 2015 01:34PM |
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Re: New ARM Controller Board December 08, 2015 04:12AM |
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Re: New ARM Controller Board December 08, 2015 03:00PM |
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Re: New ARM Controller Board December 09, 2015 12:47AM |
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JustAnotherOne
@Chri: Do you have a real link for Marlin2 ? The posted link only leads to ChibiOs the RTOS that Marlin2 uses.
I'm already working on a Firmware.
Re: New ARM Controller Board December 09, 2015 07:19AM |
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Re: New ARM Controller Board December 09, 2015 01:51PM |
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Re: New ARM Controller Board December 09, 2015 03:46PM |
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JustAnotherOne
The prototype boards have been rather expensive. A big part of the reason for that is the low number of fabricated boards. Producing 100 or 1000 would bring a dramatic price drop. And then this board is not deigned to be cheap. It should be the best, not the cheapest..
Re: New ARM Controller Board December 09, 2015 04:25PM |
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Re: New ARM Controller Board December 22, 2015 07:44PM |
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Re: New ARM Controller Board December 23, 2015 03:46AM |
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Re: New ARM Controller Board December 23, 2015 11:45AM |
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Re: New ARM Controller Board December 23, 2015 12:47PM |
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Re: New ARM Controller Board December 23, 2015 01:19PM |
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Re: New ARM Controller Board December 23, 2015 03:25PM |
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Re: New ARM Controller Board December 23, 2015 07:27PM |
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Re: New ARM Controller Board October 20, 2016 04:29PM |
Registered: 9 years ago Posts: 552 |
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JustAnotherOne
I have been working, with a friend on a ARM Controller Board. I would like to get your feedback before building the first prototype:
Technical Data:
- CPU: ARM Cortex-M4F (Hardware Floating Point)
- 168 MHz, 1MB Flash, 192kB RAM
- 512 Byte EEPROM (I2C)
- up to 8 Steppers
- 4 Thermistor Inputs
- 1 Thermocouple Input
So what do you say ?
Re: New ARM Controller Board October 20, 2016 05:04PM |
Registered: 15 years ago Posts: 351 |
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Roxy
I would only change a couple of things. Up to this point in time 512 bytes of EEPROM was fine. I think we are somewhere in the 150 byte range for Marlin's RCBugFix branch. But the UBL code is storing multiple high resolution Mesh's in the EEPROM. It would be good to have a minimum of 4KB of EEPROM.
Re: New ARM Controller Board October 20, 2016 05:21PM |
Registered: 11 years ago Posts: 126 |