Can i use a serial-usb (mini usb) cable?
And instead of connecting a seperate supply for B+, use the #1 pin?
Motorola RAZR, RIZR, Z8 mini-USB Charger pinout and wiring @ pinouts.ru
#1-- +5v dc
#2-- usb data
#3-- usb data
#4-- not used
#5 ground
Which ones of the data can I use for Tx and Rx?