= Mini Bot Ultrasonic Sensor

The !PiBotZero has a dedicated connector for an external ultrasonic or laser range finder.  The connector is pin-compatible with the popular and low cost (often for [https://www.ebay.com/i/311580098337 less than $1]) HC-SR04 ultrasonic rangefinder module and this is recommended.  The !PiBot Image libraries include support for the HC-SR04 using an [http://wiki.team2537.com/browser/pibot/trunk/src/java/com/tenetics/pibot/Ultrasonic.java Ultrasonic class] that is mostly compatible with the [https://wpilib.screenstepslive.com/s/4485/m/13809/l/599715-ultrasonic-sensors-measuring-robot-distance-to-a-surface WPILib Ultrasonic class].  An example of how to use the class is in the [http://wiki.team2537.com/browser/pibot/trunk/src/java/PiBotZero.java PiBotZero demo program].

For more information see:

* http://www.modmypi.com/blog/hc-sr04-ultrasonic-range-sensor-on-the-raspberry-pi
* [http://www.modmypi.com/electronics/sensors/ultrasonic-range-sensor-hc-sr04- HC-SR04 ultrasonic with Raspberry Pi]