CUREE, the Curious Robot for Ecosystem Exploration, is another autonomous underwater vehicle built around the Raspberry Pi 4: https://warp.whoi.edu/curee/
Blue Robotics (bluerobotics.com) is also using Pi, for their BlueRov and survey boat (BlueBoat) - they’re quite nice to use (and not toys… you can add sonar, dvl, usbl locator to go at depth - max 600m with the kit)
I’m also starting to build other water/ground vehicles for underground exploration - communication and localisation are challenging, without speaking about navigation on uncertain terrain. Pi are accessible and cheap, and the Pico’s are also very useful to interface with the motors, sensor and so on.
Sadly no — you have toys (none open source and reliability is... well, let's say that the repair are regular and out of support) or you can try to create yourself a waterproof solution (that's complex). Most connector cost a lot, 3D printing is not really an option (especially at depth), pressure is not joke to deal with... And then you'll have to fight with the environment (algae, plants), water salinity, acidity and so on.
Other system at the same level costs more — I think the next one is at 25k without option.
Don't forget that if for any reason you need to reach it at depth, you'll have to dive. Please don't do that alone...
I think it's so cool you could in theory buy a satellite module eg. $250 break out board from spark fun, plug it in and be talking to a robot in the middle of the ocean. I wondered about the legal aspect, can you do that? Just release something into the wild.
Yes you can. However, international waters are a physically challenging environment and getting there requires navigating national waters which have regulatory restrictions. Of course, enforcement is probably nonexistant if you're small, barely visible, and heading straight out to sea... so, solve the "invisible awesome robot that can survive in tough conditions" problem, stock the "multi-day batteries for energy continuity" load, buy the "expensive communications" solution, and then yeah - you too can play with the big boys in the bathtub. Or ... just stick to your actual bathtub.
Now I'm wondering, those people that sail say from SF to Hawaii in a small sailboat, do they do drop routes... "take my drone to the ocean and release it"
Why not? I doubt there are any legal restrictions other than don't be a hazard to navigation. But it would probably be too small to be a hazard anyway, and likely too small to be noticed.
Anyone who would happen to come across it is likely to be suspicious of its origin and purpose, though.
I happen to drop equipment into the sea for a living on occasion, and we always paint it in garish yellow for visibility and label it clearly with contact info to allay suspicions. Typically "Scientific instrument - flux capacitor, Acme Co. - www.bar.org // foo@bar.org // 555-2368"
Also, we notify the coastal administration and the mapping agency so that an EfS (NOTMAR; Notices for Mariners) may be issued if they deem it necessary.
A cynical colleague suggested we had better label them 'Highly radioactive' to keep fishermen from picking them up and taking them apart out of curiosity...
