The Pro-Wave SRM400 sonar ranging modules and US040 sensors are widely used for car reversing aids and are very popular with volume manufacturers and after market suppliers.
The SRM400 is a sonar ranging module utilising the newly developed Sonar Ranging IC, PW-0268, which can work with all of Pro-Wave’s PT or EP type transducers. The SRM400 provides a time-saving shortcut for design engineers who may have limited experience of analogue design and/or the operation of ultrasonic transducers. When developing car reversing systems or other distance measurement products use of this ready-to-go module allows engineers to focus their efforts on the system integration, digital processing, software and mechanical design.
The Pro-Wave US040015 is an ultrasonic sensor generates asymmetrical beam patterns, approximately ±80° about the horizontal axis and 40° about the vertical, which meets the requirements of most car reversing aids. Thanks to the newly developed Sonar Ranging Chip PW-0268 the US040015 sensor is ultra-compact aiding installation in difficult locations.
The US040015 has only three wires to connect; +V power, ground and I/O digital signal. The I/O digital signal connection is a bi-directional port and provides an open collector connection with an internal pull-high resistor. When the I/O port is being pulled low by an external switching transistor, the sensor is activated. After predetermined excitation duration, decided by the control pulse, the I/O port will again go low if a valid echo signal is detected. The US040015 deals effectively with all the analogue signals of proximity detection providing a digital output for the host system.