Originally Posted by zitron
You can power it with 5V from the servo lead, there is a regulator thingie on the sensor board. I think both the processor and the analogue parts run on 3V (or maybe 3.3V).
Yeah you are right. The Vref is apparently generated on the processor board, and is fed into the sensor board, I'm using the pot to send ~1.5V to Vref.
Great. Thanks for the help.