I recently bought an Arduino Pro Micro (https://www.sparkfun.com/products/10999) and a "mini" USB Host Shield for Arduino Pro Mini (http://www.circuitsathome.com/products- ... -pro-mini/).
I can't get the USB Host to work, not even the test program supplied with the USB Host shield. The Pro Mini seems to be pin compatible with Pro Micro, so that should not be a problem. And I'm kind of a hardware newbie to any help or pointers is appreciated.
Similar setups has been done with Teensy: http://www.pjrc.com/teensy/td_libs_USBHostShield.html
Any success stories using these or similar hardware?