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47 lines
2.0 KiB
47 lines
2.0 KiB
ServoStrap
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servo-controlled reprap 3D printer:
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this code take as input stepper information from a standard 3D printer motherboard
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and use it to control a servo-motor with active position tracker.
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i have made this code for the LMD18245 motor controller,
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i have merged the pid code of Josh Kopel
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whith the code of makerbot servo-controller board,
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you can use this code on the some board changing some values.
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Daniele Poddighe
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external ardware require a quadrature encoder, timing slit strip and a dc motor,
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all you can find inside an old printer, i have took it from canon and hp printers(psc1510)
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for motor controll you can choose different type of H-bridge, i have used LMD18245,
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you can order 3 of it on ti.com sample request, the hardware needed is explained on the datasheet but i'm drowing
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the schematic and PCB layout on eagle to make an integrated board aesy to add to ramps 1.4 or other printer motherboard
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improvements:
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1)moore faster movements on x-y axys, it mean less time to wait to print a part
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2)less noise from the motors, it will be silent
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3)the couple of the motor not decrease with the speed (like in a stepper motor)
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4)active position tracking, no more step losses,
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almost all prints will end in perfect condition because if something stop
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the head it will return to the print position
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5)less price to build a printer, almost all electronic woste (like 2D printers)
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have inside dc motors with all needed to control it
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6)resolution increased by fine setting PID costants and using angular encoder, doesn't matter if is slit disk or magnetic
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7)potentially endstops are not needed because the timing strip have special code at the begin/end
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that can be interpreted as endstop
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To use the code you need first to put the two files called digitalWriteFast.h and Keywords.txt in a folder inside arduino/libraries
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here the youtube link of the test with this code: http://goo.gl/gAia5y
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