Originally Posted by maxximuscool

I think you can hot wired the N900 USB to the car battery using some power reduction diods and resistors to reduce and limit the voltage flow to the N900 through charging method. And wired it to the ignition of the car wire.

Once you're done this then you can write a small script to limit the N900 functionality:

If N900 is charging = false then
stop pausing the music and disable FM transmitter
else if N900 is charging = true then
enable FM transmitter and Start the music
Leave the screen stay on


lol technically it's harder than it sound