Ultrasonic Sensor

= Ultrasonic sensor HC-SR04 = This is an example for measuring a distance to an obstacle with the ultrasonic sensor HC-SR04. The sensor needs an operational voltage of 5V, draws 15mA of current and you will need a level shifter if you work with an 3.3V PIC (for example a PIC32-Pinguino-220). (More to come...)

Operation
TODO