Duet Expansion Breakout board wiring
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I have a DuetEth and trying to get more steppers to work with the Duet Expansion Board. Those pages are for the Duex boards, and I skipped over them.
The Expansion board has 6 pins for each motor, and not 4 like the Duet2 boards and what I saw on those Duex boards.
Should I take a closer look? Is there something in there that would help me figure this out that I obviously missed?
Let me know and I will review it again, but this time taking my time.Thanks for the help! I appreciate it!
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Hi, I think the expansion board is meant to connect external drivers, with step and direction signals, and not motors directly.
It's different from duex2 and 5 wich have additional on board stepper drivers. -
Sorry I misunderstood what you were connecting.
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@3doeste At one point I thought the same thing, but the connections are labeled motors, and motors have 6 pins.... Even though the Duet2 only connects 4. Also, the connections are for a wire and not a socket for a driver. When I look up connecting external drivers, there is a picture of a custom made cable plugged into the expansion port on the duet2.
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Still curious if anyone out there knows how to connect stepper motors to the Duet2 Expansion Board.
Thanks!
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Have a look @ this i made a little time back, i think it should answer your question/problems
https://forum.duet3d.com/topic/6732/external-driver-s-how-to -
@Exerqtor
Thats a pretty good write you, but it looks like you are adding external drivers to the Duet2 board's expansion port. I have a Duet2 Expansion Breakout Board, and would assume the drivers are already on it. I just want to wire stepper motors directly to it.... It has labels on top for the motors but as mentioned, but the pin out labels don't line up with the Duet2 board (has all 6 wires for the motor, and Duet2 uses only 4).This the board I bought.
https://duet3d.dozuki.com/Wiki/Expansion_breakout_board -
It doesn't have any stepper drivers, you connect your own drivers.
Like: https://www.buildyourcnc.com/item/electronicsAndMotors-stepper-driver-3!0a (via a random search)
https://duet3d.dozuki.com/Wiki/Expansion_breakout_board -
There are 3 common ways to drive additional motors from a Duet:
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(easiest) Use a DueX2 or DueX5 expansion board. This gives you all the same benefits that the on-board drivers do, such as software-controlled current setting, variable microstepping, microstep interpolation from x16 to x256, and stall detection. Along with the additional motor outputs, you get additional heater/servo and fan outputs, and a 12V regulator to allow you to use 12V fans when using 24V power. See https://duet3d.dozuki.com/Wiki/Duex2_and_Duex5_Features.
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(for high current motors) Use high-power external drivers with optically isolated inputs (e.g. Leadshine). Some types can be driven directly from the expansion connector, but many need higher current. This is what the Expansion Breakout Board is for: it increases the current drive capability and provides connectors to make the wiring easier. It also provides two servo outputs. See https://duet3d.dozuki.com/Wiki/Using_external_stepper_motor_drivers#Section_Connecting_external_stepper_drivers_with_differential_inputs.
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(cheapest, but more work) Use low-cost Pololu or Stepstick driver modules. These can be driven directly from the expansion connector, but you must add a 100uF capacitor across the VIN supply close to each module. A simple way to wire them is to use an unpopulated RAMPS PCB, which you can buy on eBay. See https://duet3d.dozuki.com/Wiki/Using_external_stepper_motor_drivers#Section_Connecting_Pololu_style_drivers.
So in answer to your original question, you cannot drive stepper motors directly from the expansion breakout board.
HTH David
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@dc42
Thank you!
I don't know why, but I thought the DueX2/5 boards were for an older "DueX" board (that apparently doesn't exist).
And as such, I wasn't thinking they worked on the Duet2 boards and never read into them. I just thought the Expansion board I bought was the only option.
I just ordered a DueX5 and will return the Expansion board.Thanks!
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It's the DueX4 that was for the Duet 0.6 and 0.8.5.