I like to start a project by googling everything that is even somewhat related to the target area in order to get a better idea of what I'm up against. Here's a dump of the info I've obtained so far
(Operates in 4x mode, seems fairly plug-and-play (with tweaks to the register size, of course))
SPI controller, for controlling SPI-DAC (which sets the current that the stepper controller will allow):
2 options:
Pull-type solenoid:
McMasterCarr:
24VDC, 1" Stroke, continuous duty cycle, $19.92, 70155K46
(the 1.8-degree stepper and the 1000-line quadrature encoder have already been obtained, the opto-interrupter is not really worth mentioning here)
Some specs on a lock (imprecise measurements, I'll get better ones once I get my hands on a caliper):
Diameter: 1-7/8"
Shackle Travel: 5/8"
Shackle outside width: 1-3/8"
Shackle inside width: 13/16"
Shackle diameter: 1/4"
Unlocked Height: 3-9/16"
Locked Height: 2-15/16"
A stepper control "wing" for the papilio fpga board, that includes some sample code and uses a similar IC to the one that we're using:
Some links on the zedboard.org page regarding Linux stuff:
(projects:)
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