> Wouter, do you have a link for nc-busbutton info? Googling 
> didn't help to find out valid info on this approach. 

Its very simple: put a number of resistors in series. The top resistor
is connected to +5, and is in the device. The bottom one is connected to
ground. The PIC reads the voltage on the lower pin of the top resistor.
All resistors except the top one are in the user interface, with a
normall-closed pushbutton over the resistor.

No HID connector or broken cable: A/D reads 5V. HID connected but no
button pressed: 0V. One button pressed: inbetween. Arrange the resistors
to get 'evenly spaced' readings.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 
 

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