No Contact Fluid Sensor

Summary

The video demonstrates how to connect a water detection sensor module to a 12V power source and output device. It explains the color coding of the sensor wires and how to hook up the red wire to 12V positive, blue to 12V negative, yellow to the output device, and black to negative to reverse the output logic. The presenter gives examples of using this sensor to control a pump, flashing LED indicator, or provide full tank alerts. A relay must be used for high power devices exceeding the sensor's 100mA limit. Overall, the video aims to clarify the wiring and capabilities of this basic water detection sensor module.

Takeaways

• 😀 How to connect the water sensor wires - red to positive, blue to negative, yellow to output
• 👉 Black wire controls the logic - connects to negative to inverse the output
• 🔌 Can power a small load directly, or use it to activate a relay for larger loads
• ⚡ Relay allows you to switch much higher voltages and currents
• 📉 As water level drops, sensor will activate output
• 📈 As water rises, sensor will deactivate output
• 😊 Can be used to automatically turn pump on when water is low
• 🛑 And turn pump off when tank is full by connecting black wire
• 🤝 Uses very little power itself, so needs larger separate power source
• i Overall a simple but versatile sensor for detecting liquid levels

Q & A

What are the four wire colors on the sensor plug and what do they represent?

The four wire colors are black, blue, yellow, and red/tan. They represent ground, negative voltage, sensor output, and positive voltage respectively.

How is the sensor wired up to show a flashing LED when it detects water?

The red wire goes to 12V positive, the blue wire goes to 12V negative, and the yellow wire goes to the output that drives the flashing LED.

Why can't the sensor directly power a pump?

The sensor can only provide about 100 milliamps of current, which is not enough to power a pump directly. A relay would need to be used to allow the sensor to control a higher powered pump.

What does connecting the black wire to negative do?

Connecting the black wire to negative reverses the output logic. So instead of the output going high when water is detected, it goes low. This allows it to be used to detect when a tank is full and turn off the filling pump.

What voltage range can be used to power the sensor?

The sensor can be powered by 5V to 24V, either from a battery or AC transformer.

How can the sensor control a 120V AC pump?

By using a relay that has a 12V coil that the sensor can drive. The relay contacts then switch the 120V AC to the pump.

What does the schematic diagram show?

It shows how the red wire goes to positive voltage, blue to ground, yellow to the relay coil that switches the pump. This allows the low power sensor to control the high power pump.

How could this sensor be used to control filling of a tank?

It could be mounted vertically in the tank, and when the water level rises high enough to trigger the sensor, it could turn off the fill pump via a relay.

Can the sensor output be used with 5V logic instead of 12V?

Yes, the output could drive a 5V logic input instead of a 12V relay, as long as the sensor itself is powered from 5-24V.

What is the main benefit of this water sensor?

The main benefit is that it provides a simple way to automatically detect water and control pumps, valves, indicators, etc based on water presence and level.

Outlines

00:00

😀 Hooking up the water detection sensor

The paragraph provides a step-by-step explanation of how to connect the wires of a water detection sensor. It explains the color coding of the wires - black, blue, yellow and red/brown. The red wire connects to 12V positive, blue to 12V negative, yellow to output that controls an LED indicator. The black wire enables inverse logic to detect when a tank is full and turn off the pump. A relay is required to power a pump from this sensor. A circuit diagram is also shown.

Keywords

💡water sensor

The water sensor is the main device being discussed in the video. It is used to detect the presence of water and control other devices based on the water level. For example, it could be used to turn on a pump when water reaches a certain height. The water sensor has four wires - red, blue, yellow, and black - that get connected to power and ground and output a signal.

💡wires

The water sensor has four wires that need to be connected properly for it to function. There is a red wire that connects to positive power, a blue wire that connects to ground, a yellow wire that provides an output signal, and a black wire that inverts the output signal when connected to ground.

💡relay

A relay is an electrical component that the video recommends using with the water sensor. The sensor can only handle a small amount of current, but a relay allows it to switch a high-powered device like a pump on and off.

💡power supply

The video explains that the water sensor needs to be connected to a power supply in order to operate. This can be a battery providing 5-24 volts or an AC transformer converted to DC. The positive wire goes to the positive supply and the blue ground wire completes the circuit.

💡pump

One possible application suggested for the water sensor is to control a pump. The sensor could detect when a tank is empty and turn on the pump to refill it. When the tank is full, the sensor would then turn the pump back off.

💡LED indicator

The video shows the water sensor connected to an LED that flashes when water is detected. This provides a visible indication of whether water is present and the changing water levels.

💡water tank

A water storage tank is one example system where the water sensor could be installed. It would detect when the tank is empty or full and control a pump appropriately to automatically refill the tank.

💡water column

The video demonstrates the sensor's functionality using a tube filled with water. This water column changes height as water is added or removed, allowing the sensor to detect the varying water level.

💡ground/negative

Proper functioning of the sensor requires connecting the blue and sometimes black wires to ground/negative. Ground completes the circuit and negative reverses the output signal.

💡schematic

The video shows a schematic detailing how to wire the water sensor. This includes what each wire connects to and how those connect to components like a relay, pump, power supply to build a complete functioning system.

Highlights

Explains how to connect the water detector wires - red to positive, blue to negative, yellow to output

Output connected to a flashing LED indicator showing water detection

Device can power a relay to run a pump when water is detected

Limited to 100mA output, so can't power pump directly

Connect relay coil between yellow output and positive

Relay switches power to pump from separate power source

Can operate pump between 5-24VDC

Black wire inverts logic to detect full tank and turn off pump

Attaching black wire to negative reverses water detector logic

Useful to detect full tank and turn off fill pump

Schematic shows connections - brown/red to +12V, blue to ground

Yellow goes to relay coil, other coil side to +12V

Relay switches separate power circuit to pump

Can switch 110VAC pump with suitable relay

Demonstrates complete pump control system

Transcripts

i want to take a second to show you how

this works and how you hook it up

there seems to be some confusion on how

to actually get it wired up so

uh just wanted to show you now on the

end of the plug you've got a black a

blue a yellow and sometimes a red or

this one's actually kind of a tan brown

color and so those are representative as

a black blue yellow and a red wire

so in order to hook this up

you hook up your

red wire goes to the positive side in

this case i'm using 12 volts so i've got

it to 12 volts positive the blue one

goes to 12 volts negative

okay

and then the yellow

goes to your

output

all right so in this case we're having

an output to a red flashing led

to show us whether it's detecting water

or not

okay so if we look at this

jar over here when it detects water

it's going to flash okay and

as the water

gets

as it moves up the water column you

don't see anything and then as it moves

down you see water so

as

this would work this arrangement would

work if you were wanting to run a pump

in order to when the water gets too high

it'll turn on and then as the water gets

lower

it'll turn off

now this will only power about um

100 milliamps so you couldn't use this

to power

a

pump directly you'd have to have it

power a relay or something like that so

this will put out nega 12 volts negative

so you'd have to have this go to the

coil of a relay

that doesn't use more than 100 milliamps

for the coil

to the negative side and then the

positive side of the relay to the

12 volts positive and then it would

activate that relay and the relay would

be able to switch something large like a

pump

now the real confusion comes in on this

black wire here and what does it do

okay well you've noticed right now

so

there's no water but as the water comes

up

it detects it and it's flashing right

okay so if you plug that if you connect

this

uh black wire to negative

like this

it's going to do the opposite of that so

now you could use this in order to say

you've got it on here

and you want to use this

to

tell you when a tank is full okay so

then as the water rises

it turns off the pump so you have a pump

that's filling up filling up your your

tank as the water level goes down it's

going to come up it's going to fill up

the tank

until it senses the water has risen and

it's going to go off so that's what your

black wire does and it connects to the

negative side

of your 12 volt system here's just

showing it to you in the in the

schematic

so you attach the brown or it might be

red to 12 volts

the blue goes to ground which is this is

your battery so it attaches where that

triangle does those attach together

and this a 12 volt attaches to the 12

volt side of your battery or your

transformer whether you're using a

battery or a transformer it could be 5

to 24 volts

and then the yellow comes out and see

it's going to feed the coil of a relay

and the other side of the coil is going

to go to 12 volts

then

this is your relay

and so you've got 12 volts or you could

even do 110 volt

pump powered by this if you use a relay

that can handle that you could do the

coil with 12 volts or anywhere from 5 to

24 depending on what your system needs

to be and so you would have the positive

side of that you'd uh

switch it inside the relay when this

activates it'll pull it down and turn

your pump on and then this side's going

to go to ground the other side of your

pump so that's just another view of how

this thing works so that's really all

there is to it i hope this was helpful

to you thank you for watching