I use a tablet embedded in the meter cluster as my main meter.
Link G4X → Meatpi WicanUSB → Tablet (bluetooth)
The tablet has MacroDroid installed, which manages sleep behavior depending on the power supply status from the USB connector. Currently this works very well, the Realdash meter turns on when the engine is started and turns off when the engine is cut off.
However, there are times in my days when I don’t get in my car for a couple of weeks.
Is there a way to have the battery charged to maintain a minimum charge level while parked in a garage for an extended period of time?
I know I can let it idle for a few minutes and charge it until the tablet boots up, but sometimes my daughter will call me out of the blue and order me to pick her up as soon as I can.
How is the tablet being charged while driving? For my tablet setup fuse tapped into a fuse that provides power when the vehicle turns on. If you have A similar setup you would just have to fuse tab into a hot fuse which is always on even when the key is not in the ignition.
My only issues with those is that it’s possible it could lead to a dead battery depending on how many days.
Edit: I don’t know how power would work to turn on RealDash though since power is being supplied continuously. I assume you’d use a mixture of power plus if a Bluetooth device is connected.
The USB line for charging is connected to the ignition line, which allows Macrodoroid to control the sleep state of the tablet.
Is there a way to control the sleep state in conjunction with key on/off when charging power is supplied directly from the battery?