Questions tagged [water]
Involving or pertaining to liquid water (flow, storage, measurement, conductivity of, etc.)
171
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38
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Using a bottle of water as a resistor
Today, while drinking some water from a \$500mL\$ bottle, I started reading the info about the water and found out that the conductivity (\$\sigma\$) at \$25°\$C is \$147.9\mu S/cm\$. So it came to my ...
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33
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3
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Why does water damage low-voltage microelectronics so easily?
Everybody has had the time where water gets all over their electronics, and the whole thing gets ruined, like cell phones.
At that low of a voltage (3-5 volts), I don't understand why it is such ...
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22
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4
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Why does water short out PCBs? (i.e. Why doesn't electricity follow the path of least resistance?)
If copper is more conductive than water (at any reasonable PH), submerging copper electronic circuits in should have no effect, as the electricity should continue to follow the path of least ...
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4
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What about water makes it destroy electronics? [duplicate]
From my understanding water shouldn't really damage electronics, but it does.
what about water actually causes damage, and why is water with impurities such as salt make it so much worse?
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4
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Prevent corrosion of circuit board fallen in water
I apologize in advance if this question is off the topics answered on this forum. Some hours back my drone fell into some dirty water. I was able to rescue the device, unplug its battery, open up its ...
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3
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Should I cool off in water the desoldered components?
I use a REGULAR (for home-use, not for electronics) hot air gun to desolder non-SMD components from PCBs. The components are really hot (naturally) after desoldering and it takes a while until they ...
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8
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3
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Water and Electronics?
I've read a lot about people cleaning keyboards in the dishwasher. But how does the water damage electronics? Does it cause shorts on the ICs on the internal circuitry or physically get in the IC(...
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1
answer
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Are my soaked capacitors still okay?
When the delivery man dropped my capacitors off earlier yesterday he did not ring the doorbell and I had no idea they had arrived on my front step. Then an intense rainstorm showed up and soaked the ...
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7
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2
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Why does my Vbe multiplier voltage oscillate when wet?
I've built a few Vbe multipliers as cheap temp sensors. I know there are better ways to sense temperature but I am not interested in accurate measurements, and my question is exclusively about a ...
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6
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4
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Is it possible for snow covering a car battery to drain the battery? [closed]
We had a snow/ice storm last night, and somehow the snow got into the engine area. Is it possible that the snow covering the battery was the case of draining the battery?
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4
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Sensing water level electronically
I am working on an electronic water sensing mechanism.
I need to sense various levels of water as the water level is consumed and refilled in an underground water tank. Later, I want to control the ...
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5
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4
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Is it possible to do water detection with a single electrode?
I need to detect the presence of water, but there is a catch. I can only have one single electrode contacting/submerged in water. It is in a mini-tank made of plastic (for a handheld device) so I ...
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5
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2
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Why is my multimeter not measuring current?
I'm doing a little bit of experimentation with a glass of water and a 9 V battery. I added a little bit of salt to the water, and I measure the resistance in the water from probe to probe to be ~60 kΩ....
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5
votes
2
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Is USB-C unsafe in humid/water conditions? [closed]
We had a case in France of a teenager who died by electrocution while taking a bath when his phone that was being charged fell in the bathtub (as reported by the press).
How is it possible taken into ...
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5
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5
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How is saltwater able to conduct electric charge between two wires?
Say I put some wires in a container filled with saltwater, but the wires do not touch, and I connect these wires to a battery:
simulate this circuit – Schematic created using CircuitLab
I know ...
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5
votes
1
answer
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Use a 15µf capacitor instead of original 12.5 µf for a water pump?
I have a 0.5 HP water pump. It's having trouble in starting and I have noticed the capacitor is damaged. It had a 12.5 µF 450V capacitor. When i went to buy a new capacitor the seller gave me a 15 µf ...
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1
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Water level capacitive probe topology
I'm building a small capacitive water level sensor for a reservoir (16cm tall x 10cm x 7cm).
This prototype gives me 10pF on free air and 20~30pF on medium water levels, so its definetively doable (...
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Will this water level indicator circuit work for my project?
I have only rudimentary knowledge of electronics so I ask for your forbearance.
There are many water level indicator circuits, of the type shown below, listed online and demonstrated on YouTube.
The ...
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4
votes
6
answers
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Measure Water Flow in a Swimming Pool
I've got an inground swimming pool, and was inspired by an ill-formed question that was recently posted. I would like to non-invasively measure the volume of water my pump is circulating through the ...
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4
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4
answers
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How to detect distilled water?
I'm trying to create a circuit that detects water, however, I'm looking for a very accurate circuit that can even detect distilled water.
My current circuit uses an Arduino that has a pin constantly ...
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4
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3
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Solar watering system for greenhouse [closed]
I wish to build an automatic watering system for my greenhouse and I would like to get some advice on how to do it.
Here is a sketch of the greenhouse system:
What I have right now:
Solar Panel (10W,...
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4
votes
6
answers
683
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What sensor(s) to detect (frozen) steamed up mirrors?
I am trying to build a (solar powered) device that heats up a mirror a bit until all steam/mist that was on it is gone. In the winter, the water is frozen. This is to remove any visual obstructing ...
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4
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3
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Building a pH meter circuit - is it feasible?
Let's say I have a budget of $15-20 to build a pH meter. I will then read the analog values from a microcontroller or such, but I want to first focus on somehow getting a reliable pH value on a ...
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4
votes
2
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Could you submerge any electronic device (with no applied power) and see no ill effects?
In theory, could you completely submerge an electronic device in water, let it fully dry out, apply power, and see no ill effects?
My logic: I can't see how how you wouldn't be able to do this. I ...
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votes
1
answer
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Use water as a conductor for a circuit powered by 1.5v battery
I've tried to create this quite simple circuit.
V1: 1.5 v (AA battery)
LAMP1: 1.5 v, 0.2 a (E10 incandescent light bulb)
"Salt water": 10 ml regular water + 1 g salt
When I connect the wires ...
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4
votes
3
answers
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12v nichrome wire water heater. Is it safe?
I want to heat the contents (water) of a two liter thermos flask using a low power (50-100 watt) 12 volt DC heater.
Rather than buying a tiny little immersion heater, I've got some nichrome wire ...
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3
votes
3
answers
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Electrical conductivity to determine reservoir water level to switch on/off pump
Did a survey of the commercial products available in the local market, which are broadly classified as 'Automatic Water Level Controller' or 'Automatic Pump Controllers', and found that all of them ...
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3
votes
6
answers
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Water level monitoring: simplest way
I like to develop a water level monitoring for my cistern tank: empty level, low level, mid level, high level.
One of my booster pumps broke because it runs even when there is no water in the cistern ...
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3
votes
2
answers
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What is the common name for this seal-in relay?
I'm trying to build a hysteresis water pump system with 2 water level switches. Please see the diagram and explanation of this setup I've taken off the web:
The first switch (L) is set at the minimum ...
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3
votes
5
answers
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Remote Controlled Water Valve
I have been planning on building a rain water collection system for my parents to be used for watering their dogs outside. I thought it would be a cool project to automate the watering process. ...
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3
votes
2
answers
3k
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Controlling the turn on/off of a 380-440V high voltage water pump
I'd like to control the turn on/off of a NFw Series Centrifugal Water Pump 380-440V high voltage water pump using an Arduino.
I have searched for how control it, but I haven't found any ideas. Can ...
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3
votes
3
answers
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Is there any arduino module to control water flow?
I want to build my super cool auto flower water gadget. I'm looking for some arduino module like valve or water gate, which can be controlled by input power. So, it can open or close water flow from ...
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3
votes
3
answers
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Turn on LED when an electrode or contact is submerged in saltwater
this is my first post here, thanks in advance for any help you can render. I am working on a project that turns on one 5mm white LED running on a 3.7v lipo battery when it comes in contact with ...
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3
votes
1
answer
403
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Water level indicator LED lights up even though circuit is open
I have built a water level indicator with a 555 timer. The supply is a 12 V SMPS adapter, the output of 555 timer is a square wave with a 21 kHz frequency. I pass this signal into AC coupling to ...
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3
votes
3
answers
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Flooded LAN RJ-45 connector may damage connected router? [closed]
I had an accident in the house and one of the LAN (cat. 6) cables including RJ-45 connector has been flooded. This "flooded" cable, along with other (dry) ones, was connected into a working gigabit ...
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3
votes
1
answer
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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-...
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3
votes
2
answers
476
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How to sense when a plant needs to be watered?
Im trying to design an embedded system that detects when a plant needs more water (mostly the kind of plants you have in at home in a pot)
What kind of sensors would you recommend?
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3
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1
answer
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Point Water Level sensor
The company I work for uses conductive point-level water sensors to determine water level in a small tank. The manufacturer of these sensors has proven to have very unreliable quality control and ~30% ...
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votes
4
answers
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Can I dip a soldering iron in water to cool it down?
I have a cheapo soldering station (Duratool D02265). It is fine for what I need. But, I often want to swap the tips round quickly, without waiting for ages for it to cool down!
I was wondering:
Can ...
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3
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What can I replace copper with for my salt water battery?
I and my friends were trying to make a salt water battery, but we cannot find copper strips in our town. Is there any other electrode we can use to make our battery? We have aluminum foil (which is ...
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2
votes
2
answers
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If a shipboard antenna isn't "grounded" to the water on a fiberglass-hulled boat, would using the radio (TX or RX) attract more lightning?
Because of my poor understanding of the interaction between static and flowing electrical charge, I don't trust my intuition about the answer to this question.
Essentially I'm asking if there could be ...
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2
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3
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9k
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How to calculate the resistance measured between probes in water
I have read already quiet a lot about the conductivity of water/ fluids but I cannot find a formula to calculate the resistance between probes in a fluid.
For example:
use-water-as-a-conductor-for-a-...
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2
votes
1
answer
334
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What is this component
I am trying to identify this electrical component at my work, it acts a leak detection sensor on a pump that when exposed to water will shut down the system.
Thank You !
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1
answer
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Can WD40 be used to mitigate water damage on electronics?
I've heard the advice that WD40 is designed to repel water, and hence, it can supposedly be used to mitigate water damage in electronics. Such as for a device that was submerged, instead of simply ...
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2
votes
2
answers
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Modelling I2C capacitance for cables under water
My setup works fine with following combination of hardware:
Raspberry Pi4 connected to a TCA9548A I2C Multiplexer from Texas Instruments, whereas each channel is connected over 4wires (GND, VCC, SDA, ...
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2
votes
1
answer
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What would happen if water splashed on a 12v power supply when under load? [closed]
If I am running a 40A 12v power supply at approximately 32A, and a large quantity of water splashes onto it, what physical effects will occur in a worst case scenario. I'm sure I can expect short ...
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4
answers
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Water Level Sensor Circuit
I am designing a water level controller with discrete components. But when I use DC sensing, the probes are getting corroded... I want to eliminate the corrosion completely, perhaps using either AC or ...
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2
votes
2
answers
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Resistor for maximum water electrolysis
I've partaken in an experiment where I am looking to create the most efficient way to conduct water electrolysis.
My only need is that I don't trip a breaker. I will be running at 120vac, and likely ...
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2
votes
1
answer
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Liquid / water level detection safely using AC voltage - Industrial circuit explanation
I am planning on working on a project to build a controller which will be used to detect the levels of water treatment chemical tanks and display them on a bar graph. then switch off the dosing pumps ...
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2
votes
2
answers
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Electric Analogy to Hydro-Electric Power Plant
What is the right electric analogy for the system of power generation in hydro-electric power plants? I am especially curious in designing the surge tank with the symbols for electric components.
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