Using a Duet 2 board with external stepper drivers
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And @dc42 , there is a +5V input in the DCI, so why is there need for an additional breakbout board? Is that 5V not sufficient?
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@peterartechno said in Using a Duet 2 board with external stepper drivers:
And @dc42 , there is a +5V input in the DCI, so why is there need for an additional breakbout board? Is that 5V not sufficient?
The outputs on the expansion header and CONN_LCD only have 3.3v signals levels, so they are not safe to use with a 5V supply.
The usual way of driving 12V fans from a Duet 2 is to use a step-down converter to generate 12V and feed its output into the centre pin of the V_FAN jumper block.
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Ah I see I have 24V fans so that will not be a problem. When reading the page of the expansion breakout board, I read that the board will have a voltage of 3.6V. When I follow the instructions, it states that I have to put the STEP+ of my driver in the +5V of my servo connector (one of the two). But if I have more than 2 drivers, how do I set it up within the expansion board?
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You can connect multiple STEP+, DIR+ and ENA+ wires from your driver to the same +5V pin.
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How does it get the signals then? From all the - pins?
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@peterartechno said in Using a Duet 2 board with external stepper drivers:
How does it get the signals then? From all the - pins?
Yes, it's the difference in voltage between the + and - pins at the external driver input that the driver responds to.
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okay thanks, is there also a limit to how much pins you can connect to the 5V pin? I assume that there is a maximum of amperage that it can hold? I have 3 d808 leadshine stepper drivers.
Is it also possible to connect the E+, D+ and S+ within the driver and using one cable to get to the 5v?
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Each external driver input pin draws only about 10mA or less, so you can connect as many as necessary to each +5V pin.
If we ever revise the EBOB design, we'll likely add a +5V pin to each stepper driver output connector to make this type of wiring easier.
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Thanks for your answer. I found out that my driver also accepts 3.3V (tested with arduino mega). Is it possible to directly connect the 6 pins from the EBOB to the driver? No extra 3.3V pin
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@peterartechno said in Using a Duet 2 board with external stepper drivers:
Thanks for your answer. I found out that my driver also accepts 3.3V (tested with arduino mega). Is it possible to directly connect the 6 pins from the EBOB to the driver? No extra 3.3V pin
Yes.
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@peterartechno said in Using a Duet 2 board with external stepper drivers:
Is it also possible to connect the E+, D+ and S+ within the driver and using one cable to get to the 5v?
Yes, that too.
