Thanks for the info. I did something similar in my other car.I see the question is for gtlotus and we definitely welcome gtlotus's comments
For me, I actually pull out the stereo uint and attach a +12V to the ACC wire - so I now have a "regular" +12V cigarette outlet (cuts the power when you pull the key out) instead of our Lotus "always ON" cigarette outlet. Then use a simple 12V to USB plug to supply my android dash the power when the car key inserted and turned on. I simply turn off the app (touch the "OFF" at lower corner ), turn off the engine, and pull the key away....then the power supply is cut so the phone will go to sleep mode with a black screen after a few seconds. And when I come back to my Elise, I insert the key, turn the power on, the phone will be wake up and I unlock the screen, touch the ADD-111R (or ADD-PRO) icon, the app starts
Are you using the app with one of those "fast" (read: expensive) obd2 dongles like or just a generic one? Can the generic ones read fast enough to be plotting so many things?