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  1. 27-02-2018 #3
    john swift's Avatar
    Lives in merseyside, United Kingdom.
    john swift
    Last Activity: 18-01-2021 Has been a member for 9-10 years. Has a total post count of 257. Received thanks 53 times, giving thanks to others 0 times.
    the Chinese BOB can be powered 2 ways

    either via the USB connector or
    connecting a 5V power supply to the 5V input screw terminals

    the switch selects which powers the board

    Click image for larger version.  Name: chinese BOB.jpg  Views: 636  Size: 119.9 KB  ID: 23846

    Click image for larger version.  Name: chinese breakout board.jpg  Views: 651  Size: 163.1 KB  ID: 23847

    note :-
    the input circuit for pins 10 to13 +15
    has an design error the 74HC14 is missing the 5V supply to pin 14 !!

    adding a wire link to pin 14 on the adjacent IC solves the problem

    Click image for larger version.  Name: +5V link.jpg  Views: 580  Size: 98.0 KB  ID: 23848
    John

    PS
    can you give more details of the on/off switch
    do you mean E-stop switch ???
    Last edited by john swift; 27-02-2018 at 06:10 PM. Reason: add PS
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