Questions tagged [water]
Involving or pertaining to liquid water (flow, storage, measurement, conductivity of, etc.)
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Washing potentiometers with de-ionized water, or with distilled water?
I am aware water conducts electricity because of its impurities.
However I am not sure if distilled water is pure enough to be safe to use to wash the potentiometers(and electronic boards in general), ...
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4
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Can I use a plastic water tube as resistance to protect bathing people within a safe voltage?
Suppose home water has a resistivity of 2 Ωm, home electricity is AC 220 V, and human body in shower has a resistance of 1 kΩ.
Then a resistance R = 8.2 kΩ, which is a plastic water pipe of 1.29 m in ...
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Why are two 555 ICs used in this automatic plant watering system's circuit diagram?
I have been working on this project but couldn't figure out why two 555 ICs are used and how they contributed to the operation.
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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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How to check the functionality of all the pins on stm32?
What happened: I was carrying my stm32 f401re inside a bag, and there was a little droplets of water inside the bag, when I removed the bag the MCU was wet, I wiped it gently on my clothes before ...
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Water level indicator using transistors
I'm trying to designing a water level indicator using npn transistor(BC548). I tried simulating the circuit on PSpice, but I don't know what to add for the sensor. I want a graph.
The circuit will ...
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Using a voltage regulator dimmer with a 220V water pump
I am builgin a hydroponics vertical farm. The motor which I bought is too powerful (220V/100W) for my system so I want to reduce its power with using a voltage regulator dimmer.
My motor has a ground ...
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Small electrical water heater
When I was much younger than my current 64 years of age, I saw water heaters made using simply two single electrical 110 V wires and some form of a connection between the two, to simply stick in a cup ...
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The reason behind LEDS getting dim (Water level indicator using ULN 2003) [closed]
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Whenever I switch on the circuit, the LEDs glow fully for a second and gets off. After 2-3 seconds they start glowing slowly.
What might be the reason for the above?
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Is there a fluid that visually displays electrical voltage/current?
I have a device that subjects fluid in a cuvette to a DC voltage waveform for a few seconds. The device is pretty powerful (lots of capacitors), able to continuously deliver up to 1,000 Vdc @ 40 A ...
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How can a mobile phone being charged kill by electrocution?
We have in France a wave of warnings about using a mobile phone while being charged in humid environments (or when taking a bath).
A charger is plugged directly into the wall socket and the charge ...
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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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Smart watchdog water alarm critique and questions
I've developed a smart circuit for the watchdog water alarm (teardown here)and I am ready to have PCBs made up. Before I do so I would like to get everyone's critique and as an amateur I do have a few ...
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Nodemcu: How to extend sensor wires?
I am using a Water flow sensor connected to v2 nodemcu. However, this sensor needs to be placed at a distance of 40 feets from nodemcu, on the 3rd floor of my apartment roof (I stay on 1st floor).
The ...
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how to detect water level using NodeMCU in overhead tank?
I am making a simple water level alarm connected to my V2 NodeMCU. Using the principle of water conductivity.
Two wires with stripped ends are dipped into the tank. As soon as the water level reaches ...
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How dangerous are high voltage batteries in water?
I am currently building an electric surfboard. The power source will be 16 li ion batteries in series to make a nominal 57.6 volts. My question is pertaining to the possibility of water flooding the ...
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Turn off LED when submerged in water
I want to do a simple project where an LED turns off when it is submerged in water.
I thought this would be simple because when you short the two leads of an LED with wire, it just shorts the power ...
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Can I use medical injection water to fill lead acid battery?
Can I use sodium chloride injection ip (0.9% W/V) instead of distilled water to fill a lead acid battery?
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Water flow sensor still active after water stops
I have a water flow sensor that uses a rotor with a Hall sensor (ATS177 SIP-3 Hall effect sensor latch). The problem is that the rotor keeps spinning for some time after the water flow stops.
Video on ...
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Is there a way to measure ripples in water with some kind of sensor?
Imagine you have a water tank on the top of a truck (like firefighters have.)Is there a way to measure how much the water ripples with some sensor?
I know sensors that just tell you if there is water ...
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Circuit is not getting completed by bucket water
I have a battery and a 5V active buzzer. Putting the end of circuits (just raw wire) in the bucket full of the tap water is not completing the circuit.
The buzzer, battery, and circuit are fine since ...
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More than sqrt(2)*AC after the rectifier. Why?
I encountered the following issue: supplying one working PCB with two different transformers (same model), the voltages on the PCB are different (higher!), even though the output voltages of the ...
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Are electrode based, water level monitoring systems safe?
I want to install a pump control with water level monitoring system.
I've seen all kind of sensors, ultrasonic, infrared, mechanical (Based in pressure switch's / float valves), etc.
One of the most ...
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Can I clean/Salvage this board?
wondering if anyone could help me out here. I don't work with PCBs, but troubleshooting a salt chlorine generator for my pool and believe the board in the pics below is the cause. My question is, does ...
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3
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Control overshooting
Suppose I want to control a portable electric stove in order to bring a big pot of water to, say, 70°C.
The first thing that came to my mind was the simplest: use one of those power plug+termocouple ...
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Water level indicator LEDs one by one
I want to make a water level indicator but, instead of all LEDs lighting at 100% (for example) I want the top one only to light and the rest turn off
at 0% all LEDs off
at 25% the first LED on
at 50% ...
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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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Is energy consumption of the 3kw kettle lower than 2kw kettle? [closed]
On the market there are 2kw 1.7 liter kettles and also 3kw 1.7 liter kettles.
I understand that bringing the same quantity of water to the same temperature require same amount of energy, but from the ...
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Understanding electricity as water, what does it mean to "draw 30 amp"?
Is this analogy correct? Think of electricity as water. The source is a big basket full of water, wires are pipes. Turning a switch means opening a pipe; as the water flows it makes the engine turn....
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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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PCB surface finishing for underwater use
I need to find a very cheap way to detect water ad specific levels. No needs to have a linear measurement of its height.
I'm thinking about a simple FR4 PCB, with several couples of tracks. Each ...
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Water damage repair on solders
So this is the cicuit for a 1h0257j VolksWagen polo vacum pump for central lock. I got it for practice since it was replaced.
The question the problematic part seems to be a burned soldering, it is ...
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AC water sensor for electrolysis
I have 2 electrodes placed in a water bucket for electrolysis, electrode[A], and electrode[B].
I am supplying a positive DC voltage to electrode[A] and connecting electrode[B] to the ground and this ...
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Does anybody know a better way to cool a heatsink that is not a fan? [closed]
I am designing a portable distiller powered by the sun. I will be heating the water with a heating coil and then when the water evaporates I will be collecting the stem in a metal tube(not sure what ...
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2
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Any DC-powered, fast water heaters,induction heaters? [closed]
Does anybody know a DC water heater? I am looking for a coil type design, so I can place it at the bottom of the container and it will get evenly heated. I need this to be DC and I am going to power ...
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Can you desalinate or distill water with a Peltier module?
Can you use both sides of a Peltier module to distill water? Using one side for heating and the other side for cooling. If so what type of Peltier module do you need and can you make it solar powered? ...
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Risks associated with water in a powered-off circuit
I think I understand fairly well by now why one wouldn't want tap water to get in contact with an electric circuit as it is conductive.
However, assuming the circuit will dry out completely before it ...
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1
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Transformer cooling difference between water cooling and air cooling [closed]
I just know air cooling method is cheaper than water cooling method. Please tell me what is the difference between air cooling and water cooling? And if you could please use some pictures to explain ...
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Ho can I light number of LEDs based on current flowing through circuit [closed]
I am trying to create a water tank level indicator which will have 2 wires going into tank one with resistors attached at increment levels and one simple wire. Is it possible to light up number of ...
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Auto off water pump only when tank is full
The water pump installed at my residence is operated on and off manually through a conventional switch wall socket.
Now, I want the pump to be automatically switched off whenever the tank is 90 ...
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2
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Issue powering up a DC water pump with Arduino Uno
I'm having issues powering up a water pump I got from a little water fountain with an Arduino Uno. I don't have the reference of the water pump, but after testing it, it works perfectly well with 5V ...
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What size capacitor do I need to reliably close a 1" US Solid motorized ball valve?
I am making a water feature that will involve a stream fed by the basin of a fountain with a pump at the end sending water back into the fountain. To control the water flow rate through the stream and ...
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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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Does water damage explain this issue?
I posted previously that the hot water button (PA in red) no longer causes the hot water solenoid (Eac in red) to dispense water. It now causes the left coffee group solenoid (G1 in green) to dispense ...
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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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Water's ability to short an L18650 cell?
Personally I no longer use 18650 cells, I use polymer packs with safety circuits.
However having once or twice in the past I have briefly shorted a connection between the positive terminal and the ...
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2
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thermal conductivity of a liquid cooler
I'm a high school student in a class called EDD, where we design a product and produce a prototype of said product. I have one issue though: My team bit off more than we could chew, and we have no ...
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Connecting Three 12V DC Water pumps to the same power source
I am new to all this and I am sure this is a very basic question, but wanted to ask before I fry some pumps up.
I have a relay, which is controlled by my raspberry pi, switching the pump on and off. ...
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Can you die when your plugged-in mobile phone falls in the bathtub? [closed]
I have questions related to the safety of using mobile devices in the bathtub. I always thought the danger in dropping it or getting water on it is mostly to the device, not to the person, but a ...
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3
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What methods are there for storing electrical potential energy in water vapor? [closed]
for an engineering class I had to create an electrical energy storage device and I began thinking about thunderstorms (I think it was a cloudy day) and how they create lighting. I know it's not ...