I had no idea the the digital inits broadcast their state change.. You make this so easy to do Berkinet. and thanks.for your comments Blaine.
Regarding the frequency counter, I still want to use it since I am choosing a wind speed that generates a signal with 2 magnetic induction reed switches/
Thus there will be an Ac voltage generated with a frequency proportional the rpms of the generator. Berkinet, is the the Phidget plug is compatible with the phidget frequency counter? it is a usb connection to the sbc3 that can generate a frequency value in Hz? I can see tat value in oh the control panel and hopefully create a device with it. If not there is more than one way to build the better mouse trap, i can convert the frequency to 1-5 output.