The distance sensor are really common in robotics projects, very useful for automation, interactive art and motion sensing.
This EASY Plug SR01 Ultrasonic integrates ultrasonic transmitter, receiver and corresponding control circuit. It uses upgraded N76E003AT20 solution.
The module comes with four fixed holes, so that can easily fix it on other devices, such as the servo plastic platform and so on.
It should be connected to the double digital interface with only one line, which is very easy to use and convenient for connection.
Note that this module matches with EASY plug control board.