None of the readings will make any sense until you fix the missing grounds. My assessment of the trigger input pin is based on your schematic, and assuming that all the grounds are connected (from what you are telling me, they are not).
None of the readings will make any sense until you fix the missing grounds. My assessment of the trigger input pin is based on your schematic, and assuming that all the grounds are connected (from what you are telling me, they are not).