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Revision to Connecting endstop switches

David Crocker

Connect Gnd to Gnd, Vcc of the opto sensor to 3V3, and the output of the opto sensor to STP. Opto sensors usually have active high outputs, so use S1 in the M574 command.
 
Note: opto endstops made to the Generation 7 design are often claimed to be 3.3V-compatible, but in fact the design is marginal with a 5V supply and frequently doesn't work at all on 3.3V. To use this design with a 3.3V supply, you may need to replace the 180 ohm opto switch series resistor resistor by 100 ohms, and either replaceohms. Tip: if your opto endswitch uses surface mount resistors, instead of removing the 1K180 ohm resistor by 10K or remove it completelyis easier to solder ma 200 or 220 ohm resistor on top of it, so that the two resistors are connected in parallel.
Note: opto endstops made to the Generation 7 design are often claimed to be 3.3V-compatible, but in fact the design is marginal with a 5V supply and frequently doesn't work at all on 3.3V. To use this design with a 3.3V supply, you may need to replace the 180 ohm opto switch series resistor resistor by 100 ohms, and either replaceohms. Tip: if your opto endswitch uses surface mount resistors, instead of removing the 1K180 ohm resistor by 10K or remove it completelyis easier to solder ma 200 or 220 ohm resistor on top of it, so that the two resistors are connected in parallel.
 
TheIf you are using either the Duet 2 Maestro has 30V-tolerantor hardware version 1.04 of the Duet 2 WiFi/Ethernet, these boards can tolerate 5V on the endstop inputs, soinputs. So if your optical endstops do not work with a 3.3V supplysupply, then instead of modifying them you can provide them with a 5V supply instead (leaving the centre pin of the endstop connector not connected) and connect the outputs of your endstops directly to the STP pins of the Duet 2 Maestroendstop connectors.
TheIf you are using either the Duet 2 Maestro has 30V-tolerantor hardware version 1.04 of the Duet 2 WiFi/Ethernet, these boards can tolerate 5V on the endstop inputs, soinputs. So if your optical endstops do not work with a 3.3V supplysupply, then instead of modifying them you can provide them with a 5V supply instead (leaving the centre pin of the endstop connector not connected) and connect the outputs of your endstops directly to the STP pins of the Duet 2 Maestroendstop connectors.
 
== Test endstop switches ==

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