= 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 Ultrasonic class that is compatible with the WPILib Ultrasonic class.

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]