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I have been looking into extra functions that could be included on the control board. We have 6 spare I/O pins on the Atmega, 3 of these are A/D capable.
Possible functions are
Start Input - wired to the cars start switch - operates main contactor
Reverse Input - from gear box reverse switch - restrict power in reverse
Fault indicator - drive dashboard light
Brake Light In - reset pwm to zero when brakes are applied
AC Plug In - wired to switch operated when charger is plugged in
Speed Sensor In - wired to hall effect sensor on motor shaft
Battery volts measurement - connected via a linear optocoupler circuit
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