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How To Build An Automatic Night-Light
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- Опубликовано: 12 мар 2020
- Learn how to build a night light that automatically turns on when it gets dark. For complete schematics and parts list visit www.build-elec...
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Thanks for watching!
Nice little control circuit there. I need to buy that light dependent resistor before I can put this into practice. Keep uploading more. I enjoy your videos!
I did the procedure as mentioned in the video, it didn't work . But when I exchanged the battery terminals the led used to glow in light and turn off in dark ....what would be reason 🤔 and how to fix it
I dont think that reversal of battery should work.. as if led is glowing in reverse polarity it means your LED was not fixed the proper way.. try to reverse LED terminals and your circuit should work.
I follow exactly as the video but it didn’t light up, what should i do? Do i need to MAKE a corong first?
Not sure what a corong is.
I may sound dumb but why do we need the 2 resistors (100k and 470 Ohms)?
Will the circuit work without the 2 resistors?
Secondly, can I use this circuit with high power LEDs, like 15Watts, 20Watts or higher?
The 470-ohm resistor is there to limit the current for the LED so that it doesn't burn out. The 100k resistor is there to create a voltage divider with the photoresistor and will decide how much light is needed to turn off the transistor (and thereby the LED).
Yes, you can use the same type of circuit for high-power LEDs, but you'll need a different transistor that can handle the amount of current you want. The BC547 I used here can only handle up to 0.1A.
@@Ohmify Can you suggest any Transistor that I can use for 12V LED lamps.. It needs a couple of Amps...?
@@johnnybuoy9551 I don't have a specific recommendation for that. But you can use Digikey's search function to find a transistor that can support enough current: www.digikey.no/products/en/discrete-semiconductor-products/transistors-bipolar-bjt-single/276?k=&pkeyword=&sv=0&umin2101=2&rfu2101=A&sf=1&FV=-8%7C276%2C69%7C411897%2C74%7C380569&quantity=&ColumnSort=0&page=1&stock=1&pageSize=25
Very informative video
Good day sir, May I ask something about the project. What if we can't find a 100k ohm resistor, what parts should you use for alternative or what components should adjust their value?
You can try a lower value. Or a potentiometer. The value you need depends on your LDR.
On the breadboard image on your website, the LED is not facing the right direction
True, I'll update it.
Can you explain why those values resistors are used please? Thanks
You'll find the explanation here: www.build-electronic-circuits.com/night-light-circuit/
how will you connect this thru wires without the breadboard? asap
Can we use 9 v battery...while connecting wires by soldering? For automatic night lamp project? Please clarify my doubt..
Yes.
The led is glowing when i keep it dark space and also when i keep my hands nearer to the breadboard then also the led is glowing . What would be the reason
It's suppose to glow in the dark, so that sounds correct.
Hello bro I made this project but in light LED is On plz help me
Hi, check the value of your photoresistor in light. It should be around 5 kilohms or less.
@@Ohmify how to check it
@@venila5328 With a multimeter
Where is schematic diagram for the circuit?
It's in the link in the description: www.build-electronic-circuits.com/night-light-circuit/
what if the led wont light up, While the parts are properly placed. What could be the reason of why wont it light up??
If you've used the correct values and the correct connections, and given that all your components are working well, then the problem must be that off value of the LDR is too high for the 100k resistor. Try a 10k resistor instead.
did this work for anyone
Can i use a plug to power it?
Yes, just convert it do a DC value of around 9V.
How to find the value of photo resistor
Learn more about it here: www.build-electronic-circuits.com/night-light-circuit/
Can you tell me the components names and with their values
You'll find them here: www.build-electronic-circuits.com/night-light-circuit/
Can you share its circuit diagram plz
www.build-electronic-circuits.com/night-light-circuit/
Does it work with 12v
Yes, but increase the resistor in series with the LED to 1000 ohms to avoid damaging the LED.
I need your automatic night light diagram!!!!
In her site
www.build-electronic-circuits.com/night-light-circuit/
There is a flaw in this diagram, copied this to the letter and the light comes on straight away, tested the components and doubled check Ed the video is a scam!
Photoresistors come in a lot of different values. If the light comes on when it's not dark, it means the value of the photoresistor is too high compared to R1. You can solve it by reducing R1. Maybe 10k will work.
Bulb tu light ma bhi glow kr raha ha
this circuit don,t work, by any mean
That happens a lot with me too. The next step is to troubleshoot and figure out why your circuit isn't working. If you explain a little bit about what you're seeing, I can give you some pointers.