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If you are looking to pimp your ride you might want to consider adding a Capacitive Touch Sensor controlled Footwell and Glove Box LED Lightning. The code for the ATTiny85 is available so you can have a head start instead of having to figure out everything from the ground up. I think some of the major car manufactures should wake up and move away from the old click switches to something like this which offers enhanced flexibility.
 “The switching unit has 2 sets of pin pairs and 1 switch.  The switch is used to control the rear passenger LED and is discussed here.  Each set of pins are capacitive-sensing touch sensors.  Touch them once and the LEDs ramp up (on), touch them again to power them off.  The top pair control the foot well LEDs, the bottom controls the glove box LED.”
