This discussion originally started in the X6R thread if you want to read or respond there: KronoReview: Eagle Eye X6R
TomE was helping a ton but maybe some other people can chime in so I don’t feel like I’m pestering him too much. 
The the X6R is a rechargeable clicky+eswitch light with the charging circuit separate but stacked on the driver, so a driver swap is possible. The tail clicky has to be ‘on’ to complete the circuit while charging.
I am going to use STAR dual-switch, but I would like the driver to know when the charger is connected and set PWM to 0 while charging, then turn the light back on when the charger is disconnected. I figured I could use the unused pin (#3?) for this. What can the I/O pins on a 13a measure? Can I just airwire that pin to the 5v power input? I assume the actual code for this would be very simple, but I dont know how to do it.