ULTRASONIC Base Board for HC-SR04 for distance measurement with UART output is an amazing product that provides very short to long-range detection and ranging. The sensor provides precise, stable non-contact distance measurements from about 2cm to 400 cm with very high accuracy. Its compact size, higher range and easy usability make it a handy sensor for distance measurement and mapping. The board can easily be interfaced to microcontrollers RX pin (USART). At every 50ms sensor transmits an ultrasonic burst and send out ASCII value of distance that corresponds to the time required for the burst echo to return to the sensor. This sensor is perfect for any number of applications that require you to perform measurements between moving or stationary objects. Naturally, robotics applications are very popular but you’ll also find this product to be useful in security systems or as an infrared replacement if so desired. Since it is very stable, the “echo” ultrasonic sensor module can be used for micro mouse application instead of IR sensor.