Home/Limit switch sanity check
11 Aug 2013 00:14 #37544
by frieze
Home/Limit switch sanity check was created by frieze
So, I'm adding home switches to my sherline mill (connected to their supplied cnc driver board). There are pinouts for the parallel port pins I need (11,12,13) on the board but I wanted to do a sanity check before wiring it to power. I am planning on using 4.7Kohm pull-up resistors using the +5 and gnd wires off the floppy disk cable. Am I making a grounding or power draw error here? The parallel port pulls ground out of the PSU anyway (in theory), but I've made errors about such things in the past, so I thought I'd get a quick thumbs up/thumbs down before blue smoke comes out of my PC, rather than my usual method of asking what happened and why.
Please Log in or Create an account to join the conversation.
11 Aug 2013 18:50 #37560
by ArcEye
Replied by ArcEye on topic Home/Limit switch sanity check
Hi
This describes the procedure and possible 5v sources. I have used the 5v from a USB socket before, rather than a 5v winding from the PSU itself, which is probably capable of many amps.
www.ahmetozkurt.net/comporg/ekonomi/hw2006/selen2/inputpin.htm
Obviously it is safest to test via an optoisolated circuit, but I have no idea what Sherline provide, they are not used much over here.
regards
This describes the procedure and possible 5v sources. I have used the 5v from a USB socket before, rather than a 5v winding from the PSU itself, which is probably capable of many amps.
www.ahmetozkurt.net/comporg/ekonomi/hw2006/selen2/inputpin.htm
Obviously it is safest to test via an optoisolated circuit, but I have no idea what Sherline provide, they are not used much over here.
regards
Please Log in or Create an account to join the conversation.
Time to create page: 0.097 seconds