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Building a Home Security System with BeagleBone by Bill Pretty

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Isolated output PCB

The optically isolated output PCB is a very simple construction. There are two reasons why I made a separate board in this case.

This form factor allows for a more modular design. You can have as many outputs as you can find I/O pins on BeagleBone.

It is also cheaper to order small 3.8" x 2.5" mini boards from ExpressPCB than to order a larger custom-size board.

Isolated output PCB

Isolated output PCB

Assembly of this board is very much the same as that of the first board.

  1. Install the resistors first.
  2. Install the LEDs, making sure that the polarity is correct.
  3. Install the transistors, again checking for correct installation.
  4. Install the ICs preferably on ...

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