[charrisTTI]

Assigning a value to a PWM output is not the same as turning a digital output on or off. PWM<x> is a data variable in the block of data which is passed back to the master microprocessor. The master microprocessor handles the radio link and generating the motor signals (there is a way to directly control some of the motor signals, but lets not worry about that at this point). PWM stands for Pulse Width Modulated. The signal on the pwm pin is a stream of pulses at a frequency of about 50-55Hz. The width of the pulse varies between 750 us and 2250 us. A 127 value to the pwm variable generates a pulse width of 1500 us and the motor response to this no movement. A 0 value is full speed in one direction and 255 is full speed in the opposite direction.