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RustRacer
MemberUpdate: more tweaking of the scope finally showed me the 1us (yes, one microsecond) step pulse. I still couldn’t get either of 2 types of level-shifters from Adafruit to get the external stepper driver to respond. I’ve ordered the octal bus transceiver chip that Andy referred to above. If that doesn’t work I’ll probably give up and get a normal 2-phase stepper that the TinyG’s drivers can drive.
Ben
MemberFreemore,
I’m trying the same thing with TinyG v8 and an Oriental Motor/Vexta stepper driver. It’s one of their weird 5-phase things so I can’t drive it using the TinyG’s drivers. I just need the step and direction out of TinyG, but I can’t see any signal on the Step pin. I’ve tried different speeds and different settings on the scope. I even tried while actually running a 2-phase stepper connected directly to the TinyG’s driver, but still nothing from the Step output.How did you get something from the Step pin?
MemberThanks for the response. That’s unfortunate, since hardware-wise, it should be very capable of standalone operation. The processor has an RTC (which arduino/Raspberry/beaglebone don’t seem to unless you add one on). There’s even a processor in the same family with battery-backup for the RTC (ATxmega256A3BU).
Does anyone know if this processor could be a direct replacement for the current one? It doesn’t seem like adding some functions to the code base to read the RTC would be too difficult.
MemberHas there been any resolution to this yet?
Ben
MemberI also have a 5-phase motor with one of Oriental Motor’s AlphaStep closed-loop drivers. Can this be driven with the Enable, Step, Direction via’s on the TinyG v8 board? The driver has Enable, Step, Direction inputs that want 5VDC, so I should be able to use Solid State Relays to connect, right?
If there are details on this in the Wiki, please direct me to the relevant page. I don’t seem to be able to search the wiki (or narrow down searches of the forum).
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