Department - Author 1

Electrical Engineering Department

Degree Name - Author 1

BS in Electrical Engineering



Primary Advisor

Dean Arakaki


The Shark Alert Early Warning System is a device geared toward avid beach goers such as surfers, divers, and swimmers. The system is composed of an ultrasonic transmitter mounted on a shark’s dorsal fin and a receiver worn by the user around the ankle. The receiver alerts the user to the presence of a shark upon ultrasonic signal detection.

The receiver warns the user through both visual and tactile (vibration) alerts to ensure user notification. This circuit was built and tested in the EE labs and Recreation Center pools to determine transmission range. The receiver detects the transmitted signal up to 150 feet away and fits comfortably on the user’s ankle. The alert module determines receiver detection.

The transmitter remains operational over the shark’s lifetime by hydraulic turbine-based AC power generation. This is accomplished by utilizing the shark’s movement through the water. Testing was conducted in the Cal Poly Civil Engineering Department’s Flume and in Lake Nacimiento.