For anything related to designing electronics for use in water.
Questions tagged [underwater]
58 questions
13
votes
3 answers
What electrical connectors to use underwater?
I am looking at doing a project with a AUV (autonomous underwater vehicle) and need to know the best type of connectors to use. I have listed the things I need from most important to least important:
Reliability
Ease of in…

Jake Robinson
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7
votes
3 answers
Toy with non-waterproof battery box: is this an issue? What will happen?
There is a toy that is intended to be used in water. However, we found out that the battery box (holds 2 AAA's) is not water tight and water leaks into it. Is this an issue? I know that water is conductive.
So, essentially when water leaks in, the…

milesmeow
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6
votes
2 answers
wireless transmission underwater
I am looking into constructing a closed and small device with arduino sensors that goes underwater. It has to be submerged into water and back several times, and that is made by someone with a rope attached to it. So it needs a way to communicate to…

Dani Oliveira
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6
votes
2 answers
transmit data wirelessly under water?
I am looking into constructing a small submarine with a Raspberry Pi. This is just for a hobby project but my idea is to have it communicate with the surface wirelessly. I know that normal radio waves will not work very well so I was thinking of…

Yamaha32088
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6
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3 answers
Is there a function to model the resistance between 2 metal probes
I'm trying to design something that will measure the amount of rainfall in a small container. And I was wondering if there was a function I could use to calculate the resistance of the metal probes when say we've had 5ml of rain and then 25ml of…

Dean
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6
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3 answers
60Hz "click" or clipping noise when differential amplifier is surrounded by salt water
I am a graduate student attempting to take electrophysiology recordings from a lobster under water. In the current set up I am using, two differential amplifier boards are attached the the lobster's back in waterproof casing, with a transmitter and…

Benjamin
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5
votes
3 answers
Water detector for heating element?
I want to run a 300W heating element in a water bath, but I'd like to make sure that it isn't turned on by mistake when it's out of water, so I thought of connecting it to a controller and a sensor, though I'm not quite sure about the best way to…

nbubis
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5
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2 answers
Smallest water detector / switch
I am looking for a small simple switch. But it has certain restrictions because I want to use it for salt water aquarium and copper exposure is lethal to some fauna, as well as some plastics.
Looking around the internet i found floating switches,…

Piotr Kula
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4
votes
1 answer
Shielded cable vs. unshielded in underwater environment
I know basic electromagnetic theory very well and understand why this works but I'm not sure about one thing regarding usage of coaxial (shielded) cable vs. unshielded (normal conductor) cable when using in underwater data transmission.
Shortly:…

sailfish
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4
votes
1 answer
Running a battery in propylene glycol
So I was thinking about building a deep water camera housing. The housing would be filled with a non-conductive fluid to counter the pressure at depth.
Although fluids like purified water or propylene glycol (anti-freeze mixtures) are stated to be…

user3002097
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4
votes
3 answers
Can a device be damaged by water even if there is no power supplied?
For example, say I submerged a computer mouse entirely. Assuming that I ensured that all traces of the water were gone, would the device suffer any issues?
It is my understanding currently that provided that there is no power being supplied to a…

Steffan Donal
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4
votes
1 answer
Exposed contacts for power and data in an underwater project
I have a dive flashlight that charges via a proprietary USB connector and exposed pads on the exterior. My dive computer also has similar pads that don't charge but allow for data download and programming. I have seen similar things on other marine…

CrustyAuklet
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4
votes
2 answers
Underwater Distance Sensing
I'm looking to measure distances from a submersed robotics project in the range of 1 to 20 feet (around there at least). However, the only options I seem to come across are rather heavy sonar modules that cost hundreds of dollars. Are there…

wcmartin
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3
votes
1 answer
Waterproof sonar?
I'm building sensors for an underwater robot and was wondering if it's possible to waterproof ultrasonic range finders like this one to work underwater. I have made waterproof enclosures before. However, I don't know what material will allow the…

Benjamin Chasnov
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3
votes
3 answers
What device/component from the early 1940's can listen to only a specific narrow range of acoustic frequencies?
This website briefly describes the development of the first active acoustic homing torpedo of the US Navy:
Investigation of the use of echo-ranging equipment or an "active" homing torpedo system was initiated under the auspices of NDRC in 1941 at…

DrZ214
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