I'm Thinking of Building This

Anyone know if it will work?

The USBGPIO8 is a USB-to-GPIO bridge.  Specs are here.  I want to use it to read the status of the front-panel buttons on my Thecus N5550 NAS.  (There are actually 4 buttons; the circuit diagram only shows 2 for clarity.)  I have established that the buttons are simple contact switches.

The circuit is inspired by the Background section of this article.  (This is using pull-down resistors, as shown in the lower diagram on that page.)

Other notes:

• IO2 and IO4 are set to output/on; they provide the positive voltage that is detected when a switch is closed.
• I have established through testing that all four positive connections (as I plan on using them) on the button module are wired together.
• S0 is read on IO0; S1 is read on IO7.  (I probably wouldn't actually wire things up this way, but it makes the diagram clearer.)
• The USBGPIO8 is powered (and grounded) through the USB connection.

If this is going to produce blue smoke, now would be a good time to post a comment.