ToDo.txt

     Next actions
Change lookup logging to record RFID # before lookup so that the RFID # is logged even if the lookup fails
Trap lookup exception so that the system doesn't crash and restart. 

Convert to structured logging

Convert to syslog logging

     Feature development

Allow operation without RGBLight as option (so I/O doesn't need to be allocated. (may be as simple as not loading module - needs checked)

Add PWM IO to allow light intensity variation. 

Second scan effect (toggle, ignore if on, extend timer if on)
Invalid scan effect (output off, no effect)

handle multiple contactors (just start separate parallel processes?) (immediate challenge here is multiple card readers. Linux or Python -not sure which doesn't seem to like multiple readers.  I can get devices delineated in /dev, but they no longer seem to read.)

analog current sense to support detection of machine state: on/machine running/overload