The Ping sonar is a multipurpose single-beam echosounder. It can be used as an altimeter for ROVs and AUVs, for bathymetry work aboard a USV, as an obstacle avoidance sonar, and other underwater distance measurement applications. Ping combines a compact form factor and 300 meter depth rating with an open source user interface and Arduino, C++, and Python development libraries to create a powerful new tool for marine robotics!
An echosounder, like the Ping, is one of the simplest forms of underwater sonar. It operates by using a piezoelectric transducer to send an ultrasonic acoustic pulse into the water and then listens back for echoes to return. With that information it’s able to determine the distance to the strongest echo, which is usually the ocean floor or a large object. It can also provide the full echo response (echo strength versus time) which can be plotted like the display of a fishfinder sonar.
The Ping uses a 115 kHz transducer frequency, away from those used on most boat echosounders to avoid interference. It has a measurement range of 50 meters (164 feet) and a measurement beamwidth of 30 degrees, perfect for applications on a rocking boat or for obstacle avoidance. An advanced bottom-tracking algorithm runs on the device to determine the distance to the seafloor, even in complicated situations with multiple echoes.
The Ping is housed in a rugged hard-anodized aluminum enclosure with an encapsulated transducer and a 1 meter (3.3 feet) cable with a pre-installed cable penetrator. It has four threaded mounting holes on the back and comes with a mounting bracket and hardware to make it easy to mount on the BlueROV2. The included header pin to JST-GH adapter makes it easy to plug into the USB to Serial and RS485 Adapter.
The Ping can be connected to a microcontroller device, such as an Arduino, or to a computer through a BLUART USB to Serial adapter.