Hello everyone, I thought that I would make a probe for my setup. My idea was to have one fixed plate and one movable plate attached to the probe head. These plates are initially in contact and move apart as the probe hits the surface thus breaking contact like a switch. I built this and tested away from the computer and it seemed to work ok, when the plates touch the output is 5v dropping to 0v when plates are apart. But connecting it up to pin10 of the parallel port of my laptop I found that when the connection between the plates is broken the voltage only drops to 4.6v and so emc doesnt pick this up as a trigger. Would someone please tell me why the voltage does not drop to zero as I expected it too? Is a switch insufficient for the task? I am fairly sure that I configured emc correctly, however my knowledge of electronics is very very basic. Also I checked the port BIOS settings which are ECP & EPP.
Thanks Alan ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
