Updates the OC1A and OC1B interrupt handlers to allow them to generate servo compatible waveforms. This sets the servo pulse width handler up to generate the proper pulse widths. The output port is specified by an index of 0-2 . If you are using the unipolar version of the servo signal converter, you can control two servos at once from one output port. The level may range from 0 to 255.
Smaller levels correspond to shorter pulse widths.
The pulse widths range from 0.50 msec to 2.50 msec. It should be noted that the servos I tested use this as a practical range for 180 degrees of travel on the servo arm. Test your servos with an initial level of 128, which gives a 1.50 msec pulse and will center the servo arm. For all calls to sensor functions, the idx is a value between 0 and 2. Sets the specified sensor to be an active type.