To make mini work with 5V Arduino you need to add all extra parts which exist on full size shield, namely level shifters for all input and output pins. You’d be much better off working from “Simple” shield schematic.

I recently purchased your Host Shield v.1.21, and have a couple of questions:

Question 1) Is multiplexing circuitry necessary to allow simultaneous use of the TX/RX pins, or is there a software method to allow both the USB shield and Bluetooth Mate to be used? I am trying to use both a USB mouse and Bluetooth Modem simultaneously.

To allow for use with an Arduino Uno, “BUS is routed to VCC, therefore only self-powered USB devices are expected to function,” as stated in your description of your Mini version.

Question 2) Does the above statement mean that an extra converter would be necessary to operate a USB device from an Uno using the Host Shield Mini’s design? I am trying to port this functionality to a separate PCB.

Please respond at your nearest convenience. Thank you!