Questions regarding endstop voltages and Duex2/5
I have a couple Duet Wifi (early production) but haven't put them to use yet (still designing mechanical hardware). The switches I want to use for endstops specify a minimum 5vdc for operation. AFAIK, the duet does not natively support this, but the duex2/5 expansion boards do. Is this correct? My printer design will need a duex espansion board anyway, so this makes for an easy solution. Presumably I would simply have to configure the use of the additional endstops rather than the typical ones.
Basically, my question is regarding the base Duet board – it does not have the functionality to use a jumper to set 5vdc for endstops, correct?
You haven't said what type of endstops they are. Some 5V endstops can be modified to work from 3.3V, and some can be powered from 5V while providing a 3.3V-compatible output. See https://duet3d.com/wiki/Connecting_endstop_switches.
The firmware does not currently allow you to swap endstop connectors around.
This is the switch I would like to use:
Here is some info from the PDF linked in the "More Information" tab:
Contact Rating DC5~24V 20mA (MAX) Resistive Load (10mA with LED)
Strength 100MΩ or More DC250V Megohm-meter
Voltage AC500V 50/60Hz, 1 min. between Each Terminal and Case
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I'm not sure by the description or on Misumis pages but I get the impression this is a mechanical switch with 2 wires. If so the led will be lit by 5-24V while switch circuit is not closed. You only need >= 5V if you want the LED to be lit.
I suggest you get the version without the LED. The LED may stop the Duet recognising the difference between triggered and not triggered.
Thanks. for that suggestion. I was leaning that way, just because a constantly lit LED would be annoying. Do you think the switch will work with 3.3v? I'm not sure why it wouldn't, but I'm also not an electrical engineer.
I can't see why the version without the LED wouldn't work on 3.3V.
Thanks, I'll give it a shot. I should have two IDEX printers to test the firmware on within 1-2 months. (This is the reason I want to use switches with such precision – aligning idex heads).