Newbie Voltage for end switches, but from where? - CNCzone.com-The Largest Machinist Community on the net!

s_volenszki · #1 10-20-2008, 01:33 AM

Dear experienced Members!

If I want to put end switches to my stepper drived axis, and I dont want to use external power supply, where can I get it form a motherboard?

My conception is a sign without any converts.

If you know something, please do not keep it quiet!

Alex

jalessi · #2 10-20-2008, 02:06 AM

Alex,

You can use 5 volts from the USB or from one of the drive connectors.

Jeff....

s_volenszki · #3 10-20-2008, 02:14 AM

Dear Jeff!

It is so simple!

No resistors, no interface circuit, just USB 5+ to a wire on the switch button, and the other one to LPT input pin?

Alex

jalessi · #4 10-20-2008, 02:41 AM

Alex,

You may have to use a 2.2K resistor to make sure the pin is pulled down however most people use a breakout board with optical isolation.

http://tinyurl.com/5e5zdu

s_volenszki · #5 10-20-2008, 04:31 AM

Yes! This is what I am looking for!

Many thanx!

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