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Questions tagged [water]

Involving or pertaining to liquid water (flow, storage, measurement, conductivity of, etc.)

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1answer
59 views

How can the dielectric constant of water be so high but water on electric devices can cause a short circuit? [closed]

Is it only the fact that pure water has a high dielectric constant and non-pure water i.e. the water that usually causes a short circuit is contaminated and it's the contamination mixture in the water ...
-1
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0answers
50 views

Calculate water pressure sensor current consumption

I have a Analog Water Pressure Sensor but I don't have tools to measure the current consumption or simulate pressure level in the sensor. How can I estimate the current consumption when the pressure ...
2
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1answer
128 views

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 ...
0
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1answer
76 views

Struggling to find a sensor to detect water depth that suits my purposes

I am new to finding sensors and not familiar with good resources to find what I need, so the answer may be simple. I have a small tank that I am controlling the water level in. However, the depth ...
0
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1answer
70 views

Water as a conductor and bubbles

I tried putting two extremities of a 6 volts battery into water. With salty water, bubbles appear close to the positive end. With unsalted water, what looks like a thin white foam starts to squirt ...
-2
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2answers
72 views

Can I combine water turbine without power loss? [closed]

I have this small 12V water turbine generator. I connected one of these in a pipe running from a container on my roof to the ground. (height ~6m) and reached ~9V. If I buy 6 and put them one after ...
1
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1answer
67 views

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 ...
1
vote
1answer
47 views

Refraction vs Reflection in Ultrasonic sensor for water level detection

I want to use ultrasonic module JSN-SR04 for detection of water level inside tank. The US module has single sensor for Transmission and Reception of US signals as shown below. I wonder if US sensor ...
0
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0answers
60 views

General Peltier (lack of) cooling - why?

The physics here are beyond simple. 1ml of water requires 4 watts of cooling to drop 1 degree C. Thus: 30ml x 4W x 33c = 3.96kW (IE cool 30ml by 33c needs 3.96kW of cooling) The TEC01-02015 spec ...
3
votes
2answers
255 views

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 ...
2
votes
3answers
278 views

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 ...
1
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3answers
124 views

Sensor For Continuous Water Level Measurement

I am designing water level controller for water tank and want to show the water level in LED bar Graph I know how to transmit data to MCU and show level to LED bar graph but my problem is to find ...
0
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0answers
226 views

Water level sensor for a coffee machine boiler

I made a simple water level sensor with an Arduino. A digital pin supplies 5V to a probe in a coffee machine boiler. Boiler chassis is connected to AC ground (earth) and the ground to an analog IO ...
0
votes
1answer
112 views

Avoid fire on a battery-powered device [closed]

I was trying to repair a battery-powered electric razor when I suspect there was a short-circuit. The device started heating and it began smoking a bit so I took it and put it in a bowl full of water....
0
votes
1answer
65 views

Water sensing circuit?

I was learning about GFCI and wanted to know if there was any easy way to create a simple circuit to detect when there is water. What I would like to do is make a LED turn on if a component (whether ...
1
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2answers
267 views

Tank Water Level Indicator Wire

I am building a simple water level indicator (approx like the circuit below) for my tank. However, I am wondering about the wiring, for I suppose copper cables corrode in water and produce toxic ...
2
votes
1answer
77 views

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% ...
0
votes
1answer
43 views

Non-Corrosive Water Sensing

I have been told that passing DC current through two probes in water will lead to corrosion on the terminals. Apparently AC does not cause corrosion. Preventing corrosion is of high importance to me....
1
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2answers
117 views

ESD problem on water tank?

We have a water level monitor attached to a water tank. The water monitor has an hydro-static (output 0-5V) water sensor that goes to the bottom of the the tank. (See figure) In most cases this works ...
0
votes
1answer
87 views

Doubts in providing power to an LED

I am making a project on water level indicator. I've completed the circuit like this: The circuit is closed through the water. The problem is even before switching on the circuit, and with terminals ...
0
votes
3answers
100 views

Is a 5V DC Voltage @ 30mA applied, applied to water, unsafe?

As my question states, I have 5V DC, with an input current of 30mA, being applied across two exposed metal electrodes which are inserted into water. I am trying to measure the conductivity of water ...
3
votes
3answers
381 views

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 ...
1
vote
1answer
234 views

Capacitive fluid level sensor design and insulation

This is a question regarding the measurement of a fluid level (in my case water) using a capacitive sensor. Capacitive sensors are a common topic, but I have one specific question: It is necessary for ...
0
votes
1answer
66 views

Safety for 48v leds in water

I'm builing a 48v DC LED system to be used inside a fountain in a public space. I'm using a 48DC 30A switching power supply. What should I do to make it safe in case any conductor gets exposed to the ...
8
votes
3answers
2k views

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 ...
5
votes
4answers
643 views

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 ...
0
votes
1answer
592 views

Conformal Coating PC Parts?

I couldn't find any topics relating specifically to this sort of thing, and even tried asking folks over on Reddit at /r/buildapc, but I didn't get many responses or many people know if it would be ...
0
votes
2answers
135 views

Is it safe to apply a voltage to a cup of water, and then use the water in that cup as a voltage source for other electronics?

From research it appears that water level detection circuits, such as the one I have included below as a diagram, work on the principle that when the water is high enough to submerge both the +ve and -...
-2
votes
1answer
110 views

Help me identify a component

I'm trying to identify a component which I'm not entirely sure what it is. Here's an image: The component I'm asking about is circled in red. The product is a reader + transmitter for water ...
0
votes
1answer
569 views

Hall Effect Flow sensor output characteristic [closed]

The cheap and convenient hall effect liquid flow sensors available for a few bucks online nearly all cite the device output as being a square pulse train whose frequency is a linear function of the ...
0
votes
1answer
41 views

Is there a Certification requirement for device using mains power in/around water

Is there a device certification requirement when using mains power (60hz / 120V) in/around water? I'd like to market a custom fish-tank with integrated lightbulb and pump. The lightbulb won't be ...
-4
votes
1answer
65 views

Electronic urn pumps [closed]

How exactly do electronic auto dispensers/pumps, such as this one, work? What are the mechanics behind it? (I'd appreciate any information provided, even if it's a comment.)
2
votes
0answers
63 views

Need a simple buzzer/LED circuit for espresso machine [duplicate]

I have an espresso machine that I tore down, reassembled with fewer components then modified it to fit a specific setup -- kind of DIY project. The machine has an autofill circuit. After I removed ...
1
vote
1answer
952 views

Water level indicator with PNP transistor

I wanted to create a circuit that Lit's up an LED when water level rises to a certain level. I have created the following schematics following the https://www.electronicshub.org/water-level-alarm-...
0
votes
1answer
468 views

Sprinkler system - long wires or long pipes?

I am in the process of installing a sprinkler system using a commercial controller. There is quite an extensive area to be covered, and I am wondering whether, for the further-away sections, it would ...
10
votes
4answers
2k views

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 ...
0
votes
2answers
311 views

variable voltage divider using transistors

I found this schematic for a water level indicator: sensor schematic I would like to modify it some. Namely, instead of illuminating LEDs I would like to make it a variable resistor (aka make a ...
1
vote
1answer
152 views

Transimpedance amplifier circuit for water conductivity

I'm trying to understand the application of the water electrical conductivity measurement circuits based on transimpedance amplifier. Here the picture of general TIA configuration And here what I'm ...
0
votes
5answers
747 views

Measuring water level inside a drinking glass

Background: I am creating an automatic tea brewing machine using an Arduino and an electric water kettle from Amazon. My family and I drink lots of tea and we have many different sizes of glasses. I ...
-4
votes
2answers
2k views

reducing temperature of drinking water from 10c to 5c in 90sec using Peltier module. I have no background in physics so please talk simply [closed]

Right straight up I have no background in physics. I need to cool drinking water 1000ml in 90 seconds. I would like to cool the water to approximately 5c +/- 1c. The temperature of the water before ...
0
votes
1answer
864 views

Buzzer is not working

I am extremely new to electronics and stuff, I was trying to design a water level indicator. In Proteus, all the LED indications are working perfectly, but for some reason my buzzer won't work.
2
votes
1answer
123 views

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 ...
4
votes
3answers
2k views

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 (...
0
votes
2answers
226 views

Trigger for a water sensor

I want to build a water sensor that disconnects the motor when: 1. tank is full 2. water in input pipe is missing. I came up with the following schematics (haven't practiced much electronics in ...
0
votes
2answers
121 views

MOSFETs leaks current between two water sensors

Goal: I've got a set of EC and pH water sensors that need to sit in the same batch of water / capture values real-time for a Arduino project. However my sensors cancel each other out when both are ...
-4
votes
2answers
375 views

How does water affect a flash mempory chip? [closed]

If a flash chip is thrown into water will it affect the data stored inside or will it still be recoverable? And if so, will this be a gradual process or immediate one? Are flash chips waterproof or ...
0
votes
1answer
168 views

Contact-less liquid level indicator [closed]

I am developing a Liquid level indicator to be used for my lab breaker. The purpose is to get real time liquid level data on computer for analysis. I have searched for many liquid detectors, but ...
4
votes
3answers
10k views

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 ...
0
votes
2answers
780 views

What relay is suitable for a submersible water pump

I have an AC submersible water pump with the following ratings: Voltage: 165v-250v/50Hz Power 18W H-max 1.8 meters Output: 1200L/h My mains voltage is ...
3
votes
1answer
249 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-...