DIY Night Activated LDR Sensor Circuit Using LEDs & Light Dependent Resistors
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- เผยแพร่เมื่อ 3 ธ.ค. 2024
- This electronics video tutorial explains how to create a night activated LDR sensor circuit using light dependent resistors. This circuit turns on a green LED in the dark. The green LED turns off when light shines on the LDR. It also explains how to create a light activated LDR circuit that causes the LED to turn on when the main light is on.
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Light Dependent Resistors: amzn.to/3B32MeE
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He is such a genius as explains any electronics subject as simple as possible.
Yes videos like this is how I learn best. Some people make clips where they will say use a lm317 a 1k ohm resistor but they never say why so I dont know how to figure the values for my own applications. This Is perfect thank you.
Best explanation in electronics across not only the web...
What about the voltage drop across R3 resistor?
When you find the Va=2.6 value?
Thanks for LEDing us through your reasoning; another wonderful video!
Man,you are such a great instructor!
Is there any video where you have made the same circuit using op-amp LM 358 or else instead of transistor
Could you go over the propities of group 2 elements?
Great educational video. Thankyou.
2 questions: 1. Why is the voltage at point A even needed for the LED, when you have 6V of Collector supply voltage above. It seems like if the voltage at point A was enough to establish a forward bias in the base, then the LED would light up due to the collector current. 2. When you calculated the required 2.6 V to activate the transistor and turn on the LED, why didn't you mention/include R3?
Can you make a video on thin film interference
Two very clever circuits. What are the light dependent resistors made from? Also, is a certain intensity of light required to trigger the light dependent resistor? I noticed in your second demonstration that either you were using some kind of night vision camera or that you had two lights of different intensities so that we could see the demonstration of course.
Clear Explanation Bro.
Everything is clear, but can NPN be any? I found some BC547B at home and tried to use it. Just to check, I connected 2 AA batteries: "plus" to C and B of transistor, E to "plus" of LED; GND of power source to the LED GND.
It should be simplest test, but the LED just barely glows. At the same time it perfectly works directly from 2xAA.
Great Video , i wou;ld like to add a back light to Victor VC97 , the thing is DMM is 3v. How to do?
It is so educative, thanks for the good job done🎉🎉❤❤
what is the specific transistor to use?
I didn't understand your last part when you reversed ldr and R1. I think the circuit here should turn the LED OFF when the main light is ON and, LED turned ON when main light is OFF but your last part is the opposite according to the resistance values you have chosen.. I'm confused. Kindly clarify
This was a great video, thanks! Could you possibly suggest a solution for my project? I have a photosensor that i am trying to defeat so that the circuit stays closed all the time, regardless of the lighting conditions. I can't think it would be as easy as simply removing the switch and joining the wires, could it? I think the entire system relies on a certain voltage to pass through the switch, but less than the 12v feeding it. If I were to measure the voltage with the switch closed, and replace the switch with a resistor that "mimicked" the output of the closed switch - would that do the job?
Thank you! This was very helpful!
hello sir, how can i increase the brighness of the led?
What about the collector recieving 6v ?
You can use an LED as a photo sensor as well. It is cheaper.
Hmm but is that mean we are always losing power? Whether light is on or off
How to make a zener diode
great great explanation thank you
very good video
Please correct your resistance symbol
Why is the input 6v when your battery is 9v?
Here how to calculate current limiting resister.
What the transistor ?
All maked only night activayed ldr light" but u an all don't know how to make day/light activated ldr light"😂😂