Ciao, I have precompiled Marlin firmware installed on a printer Prusa i3 and would like to add couple of servos. From what I understand I need to install a jumper on the 5V left pin of reset button and than the servos on right pins on reset button. Now to test if servos works I use the following g-code: M42 P11 S255 ; power ON servo 0 on pin D11 M280 P0 S90 ; set servo 0 to rest position nothing happen! My guess is that since I did not compile the firmware, servos are not enabled in the firmware and the M42 does not override the firmware configuration. Is this the case? Any suggestions? Thanks Alessandro https://reprap.org/forum/read.php?292,537564,537564#msg-537564 Fri, 14 Aug 2026 05:08:43 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?292,537564,537564#msg-537564 https://reprap.org/forum/read.php?292,537564,537564#msg-537564
I have precompiled Marlin firmware installed on a printer Prusa i3 and would like to add couple of servos.

From what I understand I need to install a jumper on the 5V left pin of reset button and than the servos on right pins on reset button.
Now to test if servos works I use the following g-code:

M42 P11 S255 ; power ON servo 0 on pin D11
M280 P0 S90 ; set servo 0 to rest position

nothing happen!
My guess is that since I did not compile the firmware, servos are not enabled in the firmware and the M42 does not override the firmware configuration.
Is this the case? Any suggestions?

Thanks
Alessandro]]> biskero Mendel90 Sun, 26 Jul 2015 09:12:22 -0400