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Wow, that was fast! Well done
I got to get my act together now and finish up the rest of the hardware asap. I am stuck obsessing over the heater driver. I am considering using a switch mode regulator as a variable current source but have to try it out on the bench.
I am going away tomorrow over the weekend and will not be able to test until next week though.
Thank you so much for helping me o
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Mallgan.O
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Controllers
After some crazy weeks at work and home I finally managed to put a couple of boards together:
I have only verified that it shows up in BOSSA and I have written dummy files to the chip so I hope it is working OK. I send one to you Ambrop7 asap.
The driver circuitry is almost finished, I am going to evaluate some components before I decide wich one to choose though.
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Mallgan.O
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Controllers
Finally a yellow tape parcel arrived
10pcs 4-layer 50x50mm for a total of $28.7 delivered 27 days after ordered. I ordered from elecrow dot com and must say I am happy with the deal.
Been a bit lazy and have not ordered the MCU's yet but I think everything else is here somewhere. If anyone is interested in a SAM3S devboard you can PM me as I don't think I will use all ten boards now. If any
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Mallgan.O
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Controllers
Since posting I have; if I understood correctly, discovered that my board is not an official Printrbot board and have a different bootloader so this may not apply to your board. Here it is anyway, you might consider burning a new bootloader if you think it is worth the hassle.
Inside is a teensy folder. Place it in your hardware folder and make a backup if you have one there already because th
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Mallgan.O
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Delta Machines
I am considering using a high side load switch with overcurrent protection in a board I am designing atm for safety reasons. Another plus with a high side switch is that you don't have to run V+ off the board begging to get shorted.
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Mallgan.O
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General
If anyone is interested in beeing able to upload from arduino ide I can upload my hardware folder so you can have a look. It is pretty convenient.
I think I should mention I am on a mac btw.
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Mallgan.O
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Delta Machines
Thanks for the input.
I was interrupted by a flue but now the is MCU developement board sent for manufacturing. I opted for the cheap shipping so we will see when it arrives.
Heres som draft specs of what I have in mind:
ARM mcu(ATSAM3S2A)
USB
4 stepper motor drivers, XYZE (A988)
3 endstop inputs, XYZ
1 PWM extruder heater driver
1 Fan control output
1 driver for external FET(bed)
2 temperatu
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Mallgan.O
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Controllers
OK. Then maybe it is best to leave out the protection on your board so you can use them as you like? Do you have any comments regarding the design? I might add that it is a 4-layer board but I only included top and bottom layer in the pdf.
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Mallgan.O
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Controllers
Layout of the developement board and schematics. The protection components are of course optional.
Ambrop, do you have tools for SMD soldering?
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Mallgan.O
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Controllers
QuoteJohnSL
And yes, you have to follow the same steps as it seems the Printrboard doesn't have a bootloader that would allow you to download the firmware directly from the Arduino IDE.
I was screwing around for hours trying to get the DFU thingy to work on my mac. Finally I got really pissed and tried to upload from arduino IDE anyway and behold, it worked
Unfortunately I was so tired and wen
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Mallgan.O
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Delta Machines
I have skimmed through the RAMPS-FD thread now, very inspiring. I hope no one is offended if I blatantly steal from the design?
If I got it right the problem was the common node of the bed heater FET lifted and current started to flow through the USB cable? Did the layout change fix it?
My biggest concern is getting the pinning of the MCU right. I can´t really get it with the pin assignment mux
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Mallgan.O
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Controllers
NoobMan:
Actually I aim for 12V tolerance as I hope 12V will be enough for my purposes. I agree you have to be careful with diodes and that is why I removed any part info in the schematic as I want to measure and verify the part first. They are intended to clamp at VDD and be sized to handle the current if you source 12V at the connector.
I realise that the pictures are to small to be of much u
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Mallgan.O
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Controllers
Hi
I have been thinking of designing a controller board myself for a while now and have recently started drafting up a schematic. Since I am not very good at programming I was hoping to stay in the comfort of 8bit but have given up on xmega that I hoped to be embraced by the devs. Now when Arduino due is here I thougt that if I choose a MCU in the ATSAM3 family maybe I could manage porting to a s
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Mallgan.O
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Controllers
They seem to be interchangeable so it would just be to pick any one of them. I´ll think I am confident enough now to go ahead study the datasheet in depth and start planning. Thanks alot for the help.
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Mallgan.O
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Firmware - experimental, borrowed, and future
Bare minimum, x,y,z and e motors, three endstops, extruder heater and fan. My design goal is a rock solid HW design as cheap as possible without compromise reliability. Thats why I want to use the smallest, cheapest MCU that I can get away with. There will be provision for bed heater but I would like to have the current path external. Hopefully a gate driver on the board and a mosfet on a piece o
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Mallgan.O
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Firmware - experimental, borrowed, and future
Thanks for the encouragement . It would be very helpful for me to have some design guidance for making the software implementation as straightforward as possible. I won't finish this in a day or even two so there will be time for firmware to mature. I will need some guidance regarding pin mapping and I guess that mirroring the pin mapping to due as much as possible is a good start? I intend to ma
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Mallgan.O
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Firmware - experimental, borrowed, and future
Hi
I want to try to make an ARM controller board design. Unfortunately I am a bit programming challenged so I wonder if anybody can estimate the effort it would take to port firmware for Arduino due to another atmel ARM MCU? I would like to make a minimalist design with one of the smaller chips and spotted ATSAM3S1A, 48 pin, 64MHz, 64k flash. Do you think this one would be a good canditate and re
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Mallgan.O
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Firmware - experimental, borrowed, and future
I am final stages of my 3DR build and as a first timer I would like to ask if you have any hints, tips or recommendations on how to go about mounting the extruder and bowden tube? I have used alu square tubing so I have to drill holes to mount it, hopefully only once. I got the spacer tip. Should it be high, low or in the middle? I assume it is best to have as short as possible tube but how short
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Mallgan.O
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Delta Machines
Do you think it would suffice with the 64-pin A3U or 44-pin A4U? No sdram support but simpler HW.
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Mallgan.O
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Controllers
My very quick look at the thing did not reveal any control input specification but, assume you have a digital "on" input pin and an analog "speed" input pin. Then you could use the dir or forward/reverse signal for the extruder motor as "on" for your spindle and use the PWM signal for the extruder heater for "speed" control.
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Mallgan.O
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Next Wave Electronics Working Group
For about the same money as a sd card connector you can get a 16Mbit serial flash memory. Would that be enough to store reasonably sized files? My printer is not finished yet so I do not have a clue of the filesize a slicer spits out. Or is the SD card more used as a convenient way to move from a remote CAD/Post processing computer to printer located elsewhere?
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Mallgan.O
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Controllers
Yes, I am very interested. They seem to offer great performance for the price. I am a hardware guy with very limited software skills so I cheer you on instead
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Mallgan.O
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Controllers
Would it be possible to put the pivot point in the center of the blue rod? Perhaps replace the bearings with plastic tubing of some sort to save weight/size/cost? Just thinking out loud.
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Mallgan.O
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Delta Machines
That looks very nice. I have been thinking of something similar. I assume you are using unanodized alu? Have you noticed any wear?
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Mallgan.O
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Developers
Thank you very much. I am not so good at working with stl.
Absolutely stunning machine
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Mallgan.O
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Delta Machines
Quotecybug
Hi Rich,
Congratulation for the 3DR !
I've designed a pair of parts to extend the bed diameter to 200 mm. Ì want to use a circular silicon heated bed and its diameter is 200 mm.
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Here are pics of parts for the 3DR-X (X for extended) :
That is awesome!
I have just started to build my 3DR and I would prefer to have a larger circle and sacrifice build height and just logge
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Mallgan.O
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Delta Machines
Would anybody like to share their oppinions on how much play is acceptable in your bearings or bushings? None att all? The LMnUU bearings, do they slide on their own due to gravity and still have no play at all?
Thanks
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Mallgan.O
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Developers
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