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Questions tagged [underwater]

For anything related to designing electronics for use in water.

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0answers
57 views

Build tips: Underwater camera that sends images over a 3g/4g network [closed]

I'm looking to keep a small camera underwater and have it take a photo every hour, and then send this photo over a cell network to an email address. I was imagining a small device powered by a ...
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0answers
91 views

Are there any sensors that can immediately tell if you are underwater or not? [closed]

I was looking for a chip that can sense it’s underwater or something if it gets wet that it can send an alert to your phone? Looking for something that is pretty small in size! Thanks for any ideas
2
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1answer
65 views

Identify this packaging

I've seen this packaging used by many companies, specifically in mobile equipment, automotive ECU's, marine, and other harsh environment applications. I doubt all these manufactures are making the ...
2
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2answers
32 views

Extend life of hygrometer? (Prevent breakdown over time)

Context: I'm working on a gardening project using a microcontroller to power grow lights and other related components after I've built on top of it. Case: I was interested in adding some hygrometers ...
2
votes
2answers
50 views

What pH sensor have a long-term use with non-calibrated?

I have a project that use some water monitoring sensors (pH, oxygen, conductivity...). But my project are facing a problem: My device can not be touch within 3 months. And as my knowledge, those ...
4
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1answer
140 views

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 ...
3
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3answers
140 views

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 ...
0
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1answer
113 views

PCB material that does not swell from water absorption?

We designed a microchip to sense high pressures under water. The chip senses pressure through a thin diaphragm that deflects and a corresponding piezoresistor circuit that measures the deflection. For ...
0
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0answers
498 views

Water Temperature Sensing with DHT22

This question may also be asked in physics stackexchange, but I'll try my luck first here. I want to set up a water temperature sensor system. My temperature sensor will most probably be DHT22 due to ...
1
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1answer
120 views

Antenna design for radio energy emission into a fresh-water test tank

I would like to emit as much RF energy in the frequency range of 433.9 to 434.5 MHz into surrounding fresh water with a 100mW transceiver. The antenna is in the middle of a 4mx8mx2m fresh-water tank ...
3
votes
1answer
229 views

Dipole Sleeve Antenna design in fresh water - Transmission frequency and emitted power?

Hello dear antenna enthusiast, I would like to receive and emit EM signals with a dipole antenna in the range of **433.9 to 434.5 MHz in fresh water. So I chose a half-wavelength dipole sleeve-...
1
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1answer
342 views

Piezoelectricity in water mediums

I am trying to run an experiment using a piezo ceramic cylindrical transducer (32X30X10MM 29 KHZ) to send a signal from the inside of a water-filled test metal tube to a transducer mounted on the ...
4
votes
1answer
121 views

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 ...
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1answer
327 views

Wireless underwater transmitter [duplicate]

Similar to this question, a need a wireless transmitter for underwater, both fresh and salt water. Vertical range needs to be a few 100 meters, and underwater depth only 2 meters. The power supply ...
0
votes
2answers
112 views

Is it safe to build a floatable speaker?

I'm thinking of building a floatable speaker to float along beside me in a lake or a small river while tubing. I've got some speakers and the following 12V amp: DROK Amplify Module Audio Component ...
0
votes
1answer
76 views

What company and/or government permits/licenses are required when selling an electrical device in the United States?

Are there specific licenses that need to be on hand, or any permits that need to be signed by various parties, in the United States, when an electronic device is sold? If it's easier, if the device ...
1
vote
1answer
312 views

Water immersion sensor

I have an object that I want to know whether it is submerged into water or not for a specific period(20 seconds for example). The object will float over the water most of the time but I want to be ...
1
vote
1answer
586 views

LED strip underwater

I am working on a project where a LED strip is placed at the bottom of a pool which will send patterns of light along the bottom of the pool. I have looked into some LED strips and found a 5V APA-102 ...
6
votes
3answers
350 views

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 ...
1
vote
1answer
564 views

Shallow underwater wireless sensor network

I need to make shallow (max 2m) underwater wireless sensor network. Data payload is about 10kB/s. I know that VLF band (~3-30kHz)could be the best solutions for that, but cause of time-to-market I ...
0
votes
1answer
657 views

aquaculture fish counting

in fish farming the fish are fed at a percentage of their weight. i measured the weight of the fish that i put into the tank, and i can remove the fish once in a while to reweigh them but that is very ...
0
votes
1answer
736 views

How to package an ultrasonic transducer so it can be submerged?

I'm looking for a way to package an ultrasonic transducer without losing too much power in the process, which will also be an easy to make it so my transducer can be submerged. My system is supposed ...
0
votes
2answers
260 views

Could some one explain me technically as to why the bandwidth is severly limited in underwater channel for communications?

I understand that, due to the harsh characteristics of the underwater channel, the effective bandwidth for communication underwater (using acoustics) is severely limited. But i would like to know the ...
4
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1answer
559 views

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 ...
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0answers
114 views

Quadcopter plummeted into the ocean

We have a quad copter which had an arm partially detach mid-flight, which in turn destabilized the vehicle, plummeting it into the ocean. After two hours of searching we were finally able to recover ...
2
votes
3answers
2k views

Water Sensor to detect backed up drain pipe?

Trying to detect when a drain pipe, filled with water from a washing machine pump, starts to get backed up. Since the water is being pumped through, a simple water detector is not enough. And since ...
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vote
2answers
2k views

Measuring water pressure in a tank

I am trying to build a pressure sensor ( PSI gauge ) that will be used to measure and monitor the pressure in a pool water filter. These generally have a mechanical pressure gauge like this.... What ...
5
votes
3answers
258 views

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, ...
5
votes
1answer
9k views

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 ...
6
votes
2answers
8k views

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 ...
3
votes
1answer
1k views

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. ...
7
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3answers
14k views

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 ...
6
votes
3answers
171 views

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 ...
5
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2answers
2k views

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 ...
4
votes
3answers
21k views

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 ...
3
votes
2answers
1k views

Is the (PVC) sheath of a consumer grade USB cable waterproof?

We are building a marine instrument that will operate at up to 30m depth in sea water. Part of the design requires that the middle part of a USB type cable is exposed to seawater. Most electronics ...
1
vote
1answer
789 views

Conductivity of water, and risk of shock? (fact checking)

Through simple researching I have discovered the unit of siemens (being a reciprocal of ohms). Now I wish to apply this to a (silly) scenario where the conductivity of tap water is 800µS/cm (from ...
13
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3answers
7k views

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: ...
3
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4answers
956 views

Looking for information about how well standard electronic components function when submerged in liquids, especially water

Tradition says that electricity and water do not mix well, but sooner or later some electronic components are going to come into contact with water. I noticed that datasheets don't mention anything ...
4
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2answers
3k views

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 ...