dummy motor driver

[seandepagnier]

If it is an arduino, it would be best to use the existing arduino sketch.   It supports 3 types of controller:

1.   servo ESC pwm, single output
   
2.   pwm and direction, two outputs
   
3.   direct hbridge, four outputs
   

I think the polulu is pwm and direction io like the vnh2sp30, but you better check this.

What  you described is not a good protocol to use because it is inefficient and lacks error checking.   It also seems like it doesn't support all the features already implemented.   Please check the source code in arduino/motor/motor.ino of the pypilot repository.