I have a 2007 Audi A4 and a 2013 VW Beetle. I'm planning to plug in some Veepeak BLE OBD II scanners and hook them up to my home automation server. I want to track a few statistics about our cars and build some dashboards. I only want to collect a few stats when the cars are turned on and before leaving the garage, and just after they arrive home and before getting turned off. Mainly just interested in tracking some simple stuff like fuel tank levels, tyre pressure, total kilometers, etc.
So I want to completely turn off the ODB II scanner when the car isn't running, so it doesn't draw any power and drain the battery. Apparently many cars will provide permanent battery power to the connector, so the ODB II scanner might drain the battery over time even if it's not doing anything.
Are there any simple fixes for this problem? Is there an ODB II scanner that can automatically turn itself off, or is there some easy way to rewire the connector (without causing any problems for mechanics in the future.) Thanks!