I'm building a touch screen kiosk using an iPad and a USB BarCode Scanner (through the camera connection kit).
the problem:
The pinout here shows the USB pin that the scanner would connect to. However it appears that the charger (info here) also requires the D+ D- Pins to initiate charging.
How can I charge the iPad at the same time as the Bar Code Scanner being used? In theory, this should be possible since iPhone/iPad do charge (however slow) while connected to a PC.
Best Answer
I haven't yet verified this with the MFi documentation. However, it sounds like Matt B. is correct in the sense that you can't be both a USB host and a USB client at the same time and charging means you're acting as a client so host functionality should stop.
Other pins such as iPod controls, audio, video, etc may remain operable still which charging since they don't use USB.