In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Jon Williams wrote:

You can write a custom PULSIN to give you as much resolution for the Ping))) as you need.  If you want to use the native (8-bit) SX/B PUSLIN then you'll need to set the resolution accordingly.

James: The Ping))) is a low-cost ultrasonic range finder.  You trigger it with a short pulse and and it returns the distance to target as a pulse width.

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