Persistence pays off! I reflashed the nano with DISABLE_VOLTAGE_SENSE and now my leds are working when I press << and >>. So now I can start building the h-bridge.
#define DISABLE_VOLTAGE_SENSE // if no voltage sense
I did not like 12V on my breadboard so had uncoupled the voltage sense wire. But it makes all the sense in the world to disable the motor when the voltage is too low or too high.
#define DISABLE_VOLTAGE_SENSE // if no voltage sense
I did not like 12V on my breadboard so had uncoupled the voltage sense wire. But it makes all the sense in the world to disable the motor when the voltage is too low or too high.