Question about end stop components on the Duet

  • Some how I ended up shorting out the Z end stop. I remapped it to another available pin so no big problem. I was wondering what component(s) are actually effected when this happens? Does it just destroy that part of the logic chip or are components involved as well?

  • administrators

    Which revision Duet do you have? The endstop inputs are well-protected on the 1.03 and 1.04 revision Duets, although if you apply 24V to one then the LED may fail, which may prevent a normal microswitch endstop working unless you add an external pull up resistor. On the earlier Duets the protection isn't as good, so applying 24V to the input might cause that microcontroller input to fail but probably nothing worse.

  • I have a DuetWifi 1.02 running firmware 2.02(RTOS) (2018-12-24b1). I double-checked my configuration and it is actually my E0 end stop that is not functioning. If I disconnect all connectors from the board and power it through the USB port, when I issue a M119 the output is "Endstops - X: not stopped, Y: not stopped, Z: at min stop, Z probe: at min stop". Note that I am using a BLTouch for my Z probe which is connected to the probe port and the Heater 3 for control, hence the Z at min reading. I'm not sure why the E0 & E1 endstops do not report in M119 but on the Machine Properties page it shows for E0 "Endstop hit = Yes".

  • administrators

    Have you tried connecting a microswitch or other endstop to the E1 endstop input? It's normal for it to read as triggered in Machine Properties when nothing is connected to it, because it is an active high input with a pull up resistor.

Log in to reply