maxmon:
Thanks for the feedback, you're right about the resistors, dropped a zero along the way. Putting a 1.5k resistor would drop the voltage to 4.8 volts, is that enough to read high on the Arduino pins?
3.0V reads HIGH, < 1.5V reads LOW, guaranteed for 5V operation of ATmega chips (see datasheet electrical
characteristics).
Note this means that 3.3V logic signals can just be read by a 5V Arduino reliably...