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  1. 06-07-2017 #13
    RickyTerzis's Avatar
    Lives in Miami, United States.
    RickyTerzis
    Last Activity: 03-08-2017 Has been a member for 7-8 years. Has a total post count of 1.
    Hi...as per my knowledge when the limit switch is closed, the EL817 opto isolator's NPN transistor will ground the printer ports input pin. The breakout board does not have any pull up resistors to ensure a printer port input is at a valid logic high when the limit switch is open.

    assembly circuit
    Last edited by RickyTerzis; 03-08-2017 at 11:27 PM.
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