Serial to USB adapter for iPod?

I am working on a project that needs a pedometer at some point. I came across this today and was hoping it would be feasible and not too difficult to setup?

It mentions being able to work with a mircocontroller using tx and rx, if this is the case I take it an Arduino Uno would be insufficient as its uses digital pins 0 and 1 (tx, rx) to communicate with the computer?

The idea would be to use it in conjunction with an sd card logger to record steps.

Has anyone on this forum has used such a device?