not that easy
I don't think it will be that easy! The dash display is LCD, and judging by the total number of segments, it must be highly multiplexed.
First, it will be very difficult to tap any of the signals, since the wire capacity or the load of any circuit you hook up to them will dampen the original signal and screw up your dash display. LCD drivers are not made to really "drive" any load.
Secondly, even if you use some low capacity, high impedance buffers to recover the signals without harm, you now need to demux the LCD drive signals to figure out which segments are lit. It's doable, but by this time it's probably easier to reverse-engineer the communication protocol.
Fred,Fred Kaluza said:
I don't think it will be that easy! The dash display is LCD, and judging by the total number of segments, it must be highly multiplexed.
First, it will be very difficult to tap any of the signals, since the wire capacity or the load of any circuit you hook up to them will dampen the original signal and screw up your dash display. LCD drivers are not made to really "drive" any load.
Secondly, even if you use some low capacity, high impedance buffers to recover the signals without harm, you now need to demux the LCD drive signals to figure out which segments are lit. It's doable, but by this time it's probably easier to reverse-engineer the communication protocol.
