I tried to use the IO0 pin or Mode pin on Panda, by hook up the Piezo
to it (positive to IO4 and negative to GND)
I use the sample code and the driver from the Piezo Hardware.
When I connected the usb power, the Visual studio did not recognize the hardware. (as shown)
But when I dissconnected the GND wire. I was able to build the app with no error.
And if I connected the GND wire back, I also able to run the app. and the Piezo works.
Can someone tell me why it happened like that?