Would like to share a drop camera system design based on BlueRobotics 4 inch tube. System has one downward facing pan/tilt cam and one horizontal panning camera. The lights for the downward cam are external led while the pan cam has an internal led light which pans in sync and is mounted about 12-14 inches above the camera itself to reduce backscatter effect. The drop cam also has a hydrophone, water velocity sensor, depth, water temp and compass. A fin is to keep the unit from spinning in a current and align with water current. To rest on the bottom a weight is attached to the unit by a short tether and holds the system on the bottom while the added buoyancy keeps the system upright.
The system is powered by a custom Li-ion battery pack. There a three arduinos for processing, one for subsea, one for surface control and one to do the video overlay. The are also several custom pcbs. The tether right now is based on a heavy duty cat5 cable with a braided outer jacket and a heavy kevlar rope feed thru the braided jacket along with the cat5 cable. Most all the internal parts and modules are 3d printed and the framework is made from 3/4 inch HDPE sheet.
The drop camera is meant for use by a local non-profit marine science center during trips offshore with youth and adults to view and hear the marine enviroment first hand where now they just can see the surface. Design and build are fairly well along.
any comments, questions or ideas are appreciated.