End stop LEDs flickering
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Hi I have a Duet2 ethernet board, running firmware 2.02, on a large custom printer.
I am seeing the endstop LEDs go bright red when the microswitch is triggered, but afterwards, they remain faintly lit and flickering. Is this normal? -
No it's not normal. Are they bare microswitches, or are they mounted on a PCB with a LED and resistors? If they are the sort with a LED then you should wire them differently. See the section on Makerbot endstop switches on the wiki page about connecting endstop switches.
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They are bare wired microswitches.They are wired to pins 1 and 3 of the connectors on the board.
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In that case it's odd that they are flickering unless the Duet doesn't have steady 5V power. How are you powering the Duet?
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I have a 12VDC supply connected to the Power In connections, .
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It sounds to me that you are using normally open switches. If the wires to them run close to stepper motor wires, they will pick up a signal by capacitive coupling, which might explain it.
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Yes the cables do run together in a large bundle from the machine to the cabinet with the Duet. The switches are configured as normally closed at the moment, but it would be easy to make them N.O.
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Normally closed is recommended. The endstop LEDs should be lit when the endstop switch is not triggered, and unlit when it is triggered.
