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Thread: Voltage for end switches, but from where?

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  1. 10-20-2008, 07:33 AM #1
    s_volenszki is offline Registered
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    Voltage for end switches, but from where?

    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
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  2. 10-20-2008, 08:06 AM #2
    jalessi is offline Gold Member
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    Smile 5 volts from the USB or from one of the drive connectors.

    Alex,

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


    Jeff....
    Attached Thumbnails Attached Thumbnails HDD Connector.jpg   USB.jpg  
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  3. 10-20-2008, 08:14 AM #3
    s_volenszki is offline Registered
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    I see.

    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
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  4. 10-20-2008, 08:41 AM #4
    jalessi is offline Gold Member
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    Smile

    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
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  5. 10-20-2008, 10:31 AM #5
    s_volenszki is offline Registered
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    Ah!

    Yes! This is what I am looking for!

    Many thanx!
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