Hi, guys, I put a lot of effort into making good videos, but for some reason only this video got a lot of views, other my videos got unnoticed, so if you like similar projects please check my latest videos as well: th-cam.com/users/ElectricalProvideos Thanks! Have a nice day.
You might want to put a diode across the solenoid to protect the transistor from back EMF. and also if you include a variable resistor you can adjust the switching point.
The ldr is reciving the light its just like if you place a battery over a speaker and as the speaker wire touches the battery terminals so it pops in or out causing continous vibration
Great project ! 👏👏Very simple to.build, just a few components 👌 By the way , i thought we need to have a free-wheeling diode connected across the relay, to protect the Mosfet against the back emf
Is there any apparent benefit of using a Mosfet instead of ordinary universal Transistors? Using ordinary transistor need a schmidt Trigger circuitry as well otherwise the Relay chatters when the light is "half bright half dark"
a two power source220v for the bulb and 12v for the relay.. thats what i wanted to know,, i am wondering if where can i get a supply from my bulb.. i though that one supply only which can regulate and amplify the current
hi there. Can you plz aso suggest an automatic time off and on system for unmanned mobile charging point. so that it does not gets heated off due to continuous charging. It may go off after a specific time and get on after a specific time.
Finally. What relay is that ? I have a programable double relay it seems it either stays on or stays off but doesn't switch. I have a breadboard with AC 5v power board (not arduino). I need a simple circuit that triggers a switch from a pir sensor. When the pir sensor area is clear I need the motor to switch on and run 10 second (pir adjusted time) then shut off. Arduino is too complicated expensive and overkill and I can't see programming thru my computer with special software hardware thru my internal terminal software writing code for an auto cat door when two relays two pir's one 3v motor on 1or 2 relays should work just fine for running once and a while on AC low voltage.
Hi, In this project, I have used 12V, 400 Ω relay. If I understand you correctly, you need some kind of 10-second timer and you don't want to use Arduino, right? I think such timer is possible to create by using a capacitor that charges or discharges, try to google "timer one transistor", and probably you will find what you need. I don't even know what voltage output your PIR sensor has, and how voltage changes if there is motion or no motion. If I understand you, you need a device that can do this: If no motion, then, turn on a motor for 10 seconds. But what voltage your motor needs? a lot of unknown...
In this project, it doesn't really matter. I've used 250 mW resistor just because I like the size, it not small and not too big, so it is perfect for my project.
please please please upload a video on how to check the resistance of the coil of your relay and how to test the MOSFET... please bro please i relly need to do this. i like the video but it is not working properly. the bulb only gllows on and doesnt turns off when i cover the ldr07.
bro could you explain about the terminals of the transistor?? I dont have knowledge about the terminals. i dont know where's the location of positive terminals,negative and so the ground.. thanks bro and more power God bless
The is a lot of information about MOSFETs just google it, please. There no positive/negative terminals, MOSFETs have Gate, Drain, and Source terminals. In our case Source connected to the ground. Ground (GND) just means negative, so it should be connected to the minus of the power supply. If you don't know where is Gate, Drain and Source terminals just google "2n7000 pinout" and look at pictures. If you need full documentation for 2n7000, then google "2n7000 datasheet pdf" and read the pdf file. If you know nothing about MOSFETs, you can watch my short video about them: th-cam.com/video/debfZWIDkgQ/w-d-xo.html And use google to find out more. Hope it helps, Good luck!
Hi, yes, I think IRFZ44 will work. But, IRFZ44 has a higher "Gate Threshold Voltage" so maybe you will need to replace 470k resistor with something lower, for example with 220k. But I am not sure that it is necessary to replace the resistor... 470k resistor may work just fine. If you replace LDR with a phototransistor it is not going to work (most likely). LDR is very different from phototransistor, you will need a different circuit for that, so my answer is: no. P.S. Greetings from Ukraine
Just asking , why you dint use a diode? at the relay? some or most of others videos like this use diode to prevent ...... and in your design you dint, please explain ty ;)
I didn't think about that much, I did not look at other circuits, I just made it myself, that is why. I am still not sure that diode is absolutely necessary, I agree that is a good idea to add it but I think it is not vital. I did try to kill 2n7000 with a relay without a diode, no success, 2n7000 is alive and works fine. Moreover, day/night change is a gradual process, so no voltage spike here. In the future projects that use relays, I'll use a diode, just in case.
Hi, BC548 and 2N7000 completely different transistors, theoretically BC548 may work but I didn't test it. BC548A, BC548B or BC548C will behave differently because they have a different current gain. Well, you can try to choose a value of the resistor experimentally. And of course, BC548 and 2N7000 have different pinouts, so you need solder it correctly before turning the device on.
Yes. I am just a little concerned about the stability of the voltage in the motorcycle (when the engine is on), it may have some impact on the stability of this device. Anyways, tell me if face any problems.
In u'r video u used 1 bulb n in u'r comment 12 v relay could received wattage max 120 W with 10A. So this circuit suitable for home circuit with of wattage max bulbs (led lamp) equal 120W , spec relay 12v 10A. Isn't it ?
12V marking on your relay means the voltage for the coil of the relay, but the contacts of the relay can work with much higher voltage, 250V in my case. The wattage depends on the voltage. The contacts of the relay can handle 10A max, but Watts=Volts*Amps, so if you going to use 12V instead of 220V as I did, we have: 10A*12V=120W, so YES, in this case, the relay can handle 120W max. But if you use 120V for example 120V*10A=1200W so ten times more... in both cases the current is not more than 10A, but wattage 120W vs 1200W.
Resistor and LDR together make a voltage divider, since the resistance of the LDR is not constant and depends on the amount of light, we have different output voltage from the divider. (Very approximate output voltage from divider: in light 1V, in dark 9V) The voltage from the divider drives the MOSFET, and when the voltage becomes higher than 2.5V the MOSFET starts to conduct electricity and starts to power the relay, and the relay turns the bulb on. Short answer: Without the resistor, the light will be always off. And the opposite: without the LDR the light will be always on.
You can use other N-Channel MOSFET transistors for this project, for example, IRF540N, or IRFZ44Z, etc. I think that it will probably work with bipolar transistors as well, but then you need to choose a correct value of the resistor.
What exactly do you mean by 220V supply? You need a regular AC to DC power supply. The power supply should be with the input of 220V AC and the 12V DC output. If your power supply can provide 12V DC then no need to change anything in the circuit.
In the video, I've used 220V light bulb, so no problems here. The relay can control 220V devices as well as 12V devices, the relay can control anything.
Hi, if you want automatically turn the light on in a room, the sensor (LDR) should be Installed outside. If it is not possible to instal sensor outside, then we should somehow make this device differentiate the light from the Sun, and from the light bulb. I know that daylight has a lot of UV, so if we cover the sensor with some kind of UV filter, then it probably will only react to the light from the Sun. But it is just my thoughts.
very nice and simple, but please do *not* use bare mains wires like that. Rather, either get a PowerSwitch Tail or a special one socket extension device that has this type of circuit in it, plugs into the wall and has a socket output to drive any mains device. Use this circuit for LED strips only, for your own safety. They're just as bright, can easily be controlled by a relay and use 12 volts.
Hi, actually BC558 is not equivalent to 2N7000. To make it work with BC558 you at least need to choose correct value of the resistor, and with a BC558 transistor, you'll also need to reverse the polarity of a power source, because it is PNP transistor.
Probably not any, but you can for example try BC547 or similar NPN transistor. I did not test it with NPN transostors at all, so I don't know if it will work, feel free to experiment.
THERE ARE MANY TYPES OF 12V RELAY..LIKE DPDT SPDT SOMETHING.. WHICH ONE DID YOU USE IN THIS PROJECT?? CAN U REPLY ASAP BECAUSE I HAVE A SCIENCE PROJECT TO DO..
Hi, I've used 12 Volt JZC-20F relay. It is SPDT NO + NC relay. You just need to find a 12V single or double pole relay, with one (or more) normally open contacts pair (NO).
Yes, but, transformers give AC, but this device requires 12 Volt DC. So if you want to use a transformer you need to use AC to DC converter (diode bridge and a capacitor). But I think it will be easier just to find a power adapter that provides 12Volt DC right away. Btw, the power adapter in the video was the power adapter from my router.
Hi! Just use NC contacts instead of NO contacts of the relay, and it will work exactly like you want. NC - means normally closed contacts, and NO means normally open contacts.
your project is excellent but finally do more thesis for low light working (this circuit is not good working in low light) relay switch does not fully work in low light or dark... evening and morning time do not come too dark & light. pls develop your project with IC & Variable Resistor thank you.
You can try to replace R1 with a variable 680K resistor, and you will be able to change On / Off threshold. But if the problem that this device needs too much darkness for turning on and too much light for turning off, it is because of hysteresis of the relay. To fix such problem a modification of the circuit is needed. Probably the best solution is to replace 2n7000 with TL431, and chose a correct value of R1, or replace R1 with a variable resistor.
Hi, I think it depends on a relay. I've just tested my relay and it can even work with 8V, but for your relay 9V may be not enough. Just connect the coil of your relay to the battery and test it yourself. But I think in order to work reliably 12V relay needs a 12V power source.
I am little bit confuse. If we setup this on street lights then street light will be start blinking at the time of sunset I/O fully lighten? What is the solution in this case?
Hi. You just need to set this up in a way so it mostly sees the light from the sun and not from the street lights itself. If it detects light from a street light that you try to control it will start blinking at night... it is because when it is too dark (in the evening) it will turn lights on, but with those lights on it is too much light so it thinks it is day and therefore turns lights off, but when lights off it becomes too dark again, so now it thinks it is night and turns lights on again, and it repeats again and again, and that is why it is blinking.
Electrical Projects [Creative Lab] You mean LRD will ignore the other street lights and will only observe direct sun light. Anyway let me try to experiment this at my backyard. Further is there any possibility to connect solar panel instead off LDR. I think Solar panel can do this job with more perfection. What you recommend?
You will not have any blinking if it senses light from other street light, but it will not ignore light from them. The light from the sun usually is much stronger than the light from street lights, so it may work fine, but it depends. You can also try to put LDR in a box in a way that it only detects light from above (the sun or the sky) and not from sides...because probably the light from your and other street lights go from a side. A solar panel also may work fine, but again it depends on the size... it should provide enough power for the relay even on a cloudy day. The clear advantage here that you only need a relay and a solar panel, and nothing more... I also had this idea with the solar panel but I did not test it.
Electrical Projects [Creative Lab] Thank you so much for all the help. There is much Electricity issues in my country and usually peoples are here careless. This project will help a lot to change the behaviour of my neighbours. GOD Bless you.
Yes, with this device you can control any bulb, (and not only bulbs) and doesn't matter what current DC or AC, also doesn't matter 12V or even 250V. But for powering of the device you should use 12 Volt DC only, just like in the video.
It cannot be the same. Can you clarify what do you mean by "the sensor sensing only light instead of dark"?, if you meant that it turns the light bulb off in darkness instead of turning it on, then it means that you are using the wrong pair of contacts (NC instead of NO). It is easy to check whether you use the correct contacts or not. To check it just disconnect wires to the coil of the relay, after this the lightbulb should be off, if it is still on it means you are using NC instead of NO.
![Electrical Projects [CreativeLab]](http://yt3.ggpht.com/ytc/AIdro_nXuaCebPi8RjzINYxrETo1-K9WQerCEIndpQMoSs0BfQ=s48-c-k-c0x00ffffff-no-rj)
Hi, guys, I put a lot of effort into making good videos, but for some reason only this video got a lot of views, other my videos got unnoticed, so if you like similar projects please check my latest videos as well: th-cam.com/users/ElectricalProvideos
Thanks! Have a nice day.
Can you use photodiode in this project
Change the value of the resistor.
you are the FIRST and ONLY person that has made this make sense after hours and hours of researching how this works!!!
thanks!!!!!
I have been looking for a simple relay switch to ad to a yard light. This is PERFECT and very well explained. Thank you
U r using transister LDR resister & rele & this is working excellent work man always made like this video
Simple but Super Project . Gr8 job.
You might want to put a diode across the solenoid to protect the transistor from back EMF. and also if you include a variable resistor you can adjust the switching point.
I came here to say that 🙂
Great vid! How do you fix the feedback light in actual application? Maybe reduce the sensitivity? Or a latch?
Wow nice it is 100% working now i made it thanks broo
Hello how to make this circuit
I had made this, it's not workink
U made some mistack try gain couse of i done it and its working
Which rating components are used in this circuit? I made it, but light continuesly glown
Well explained, thank you and baraka Allah fik
The ldr is reciving the light its just like if you place a battery over a speaker and as the speaker wire touches the battery terminals so it pops in or out causing continous vibration
Wrong explanation
Great project ! 👏👏Very simple to.build, just a few components 👌
By the way , i thought we need to have a free-wheeling diode connected across the relay, to protect the Mosfet against the back emf
That was Epic now i can put the lamp in the box and enjoy "Darkness"
@Bok ram Lmao
I think the sensor should be put outside of the house.
i like this kind of vids. VERY DETAILED
Is there any apparent benefit of using a Mosfet instead of ordinary universal Transistors? Using ordinary transistor need a schmidt Trigger circuitry as well otherwise the Relay chatters when the light is "half bright half dark"
Useful! Good work. :-)
Wow! This is awesome.
Tqsm ill make one...
i like it thump up and subscribed
Nice project.you should use diode for protec the mosfet
Good job well done..Thank you..i hope if you could do LDR with solar panel & Recharge battery
Hey bud, i want to make this but i have another light dependent resistor the model is LDR Gl5516 can i use it , please reply
Please make lot of amazing video like this video👏
Very good, similar to what I do. But I'm using different transistors.
th-cam.com/video/DpWZBAF4t-g/w-d-xo.html
Very Nice Yr Kantt projects
I am sunil
*Friends the 2n2222 transistor can be replaced by this MOSFET 2N7000* ??
*I liked the video and I left it like* !
It depends on the circuit. But without any info about the circuit, the answer is no, because 2N2222 is a bipolar transistor, and 2N7000 is a MOSFET.
*I understood friend depends on the circuit. Enrolling in your channel, thank you, my friend* .
a two power source220v for the bulb and 12v for the relay.. thats what i wanted to know,, i am wondering if where can i get a supply from my bulb.. i though that one supply only which can regulate and amplify the current
MUCHAS GRACIAS Y SALUDOS NAVIDEÑOS DESDE DOMINICANA
Hello, you can do a montage if the call does not detect light after a few seconds. It cuts the power of a relay (in 12 volts)
thank you very much
hi there. Can you plz aso suggest an automatic time off and on system for unmanned mobile charging point. so that it does not gets heated off due to continuous charging. It may go off after a specific time and get on after a specific time.
Explain something about Circuit !!!
Finally. What relay is that ? I have a programable double relay it seems it either stays on or stays off but doesn't switch. I have a breadboard with AC 5v power board (not arduino). I need a simple circuit that triggers a switch from a pir sensor. When the pir sensor area is clear I need the motor to switch on and run 10 second (pir adjusted time) then shut off. Arduino is too complicated expensive and overkill and I can't see programming thru my computer with special software hardware thru my internal terminal software writing code for an auto cat door when two relays two pir's one 3v motor on 1or 2 relays should work just fine for running once and a while on AC low voltage.
Hi, In this project, I have used 12V, 400 Ω relay. If I understand you correctly, you need some kind of 10-second timer and you don't want to use Arduino, right? I think such timer is possible to create by using a capacitor that charges or discharges, try to google "timer one transistor", and probably you will find what you need. I don't even know what voltage output your PIR sensor has, and how voltage changes if there is motion or no motion.
If I understand you, you need a device that can do this: If no motion, then, turn on a motor for 10 seconds. But what voltage your motor needs? a lot of unknown...
And ur video is awesome 🤓
Good vedio
if me using 5v volt relay with 5v supply then pls guide which transistor and resistor needed??
Hi, just use a 220k resistor instead of 470k, that is all.
I didn't test it with 5V, but it should work fine.
vedio available with 5V power supply trigger at following link th-cam.com/video/rZWEkof10g8/w-d-xo.html
What will happen if you let the flickering for 12hr? Will the relay melt or Bulb died?
please advice about 470k Resistor (how many watt) i confused in in Ebay and Alibaba.i found many types TNX
In this project, it doesn't really matter. I've used 250 mW resistor just because I like the size, it not small and not too big, so it is perfect for my project.
Very nice video
I mak projet susesfull
Hello how to make this circuit? I had made this but it's not working
plz tell me which type and model of the relay you used ?
and also tell me the terminals of each and every tools.
thnx
Kya sahi m light atometic on off hoti h or kya ldc ki jagh photo caplar laga sakte h video banaiye sir
please please please upload a video on how to check the resistance of the coil of your relay and how to test the MOSFET... please bro please i relly need to do this. i like the video but it is not working properly. the bulb only gllows on and doesnt turns off when i cover the ldr07.
bro could you explain about the terminals of the transistor?? I dont have knowledge about the terminals. i dont know where's the location of positive terminals,negative and so the ground.. thanks bro and more power God bless
The is a lot of information about MOSFETs just google it, please. There no positive/negative terminals, MOSFETs have Gate, Drain, and Source terminals. In our case Source connected to the ground. Ground (GND) just means negative, so it should be connected to the minus of the power supply. If you don't know where is Gate, Drain and Source terminals just google "2n7000 pinout" and look at pictures. If you need full documentation for 2n7000, then google "2n7000 datasheet pdf" and read the pdf file. If you know nothing about MOSFETs, you can watch my short video about them: th-cam.com/video/debfZWIDkgQ/w-d-xo.html And use google to find out more. Hope it helps, Good luck!
Thank you for the information, very useful for me
PARABÉNS FICOU MUITO BOM !👏👍
Couldn't be simpler.
I'd use a variable resister aka pot to adjust sensitivity.
May I substitute 2N7000 with IRFZ44?
May I substitute LDR with phototransistor?
Greetings from Indonesia
Hi, yes, I think IRFZ44 will work. But, IRFZ44 has a higher "Gate Threshold Voltage" so maybe you will need to replace 470k resistor with something lower, for example with 220k. But I am not sure that it is necessary to replace the resistor... 470k resistor may work just fine.
If you replace LDR with a phototransistor it is not going to work (most likely). LDR is very different from phototransistor, you will need a different circuit for that, so my answer is: no.
P.S. Greetings from Ukraine
Nice.....i want simoco notebook buddy laptop power adapter diogram&repairing videos...!!!!!!!pls!!!!!!!
Just asking , why you dint use a diode? at the relay? some or most of others videos like this use diode to prevent ...... and in your design you dint, please explain ty ;)
I didn't think about that much, I did not look at other circuits, I just made it myself, that is why. I am still not sure that diode is absolutely necessary, I agree that is a good idea to add it but I think it is not vital. I did try to kill 2n7000 with a relay without a diode, no success, 2n7000 is alive and works fine. Moreover, day/night change is a gradual process, so no voltage spike here. In the future projects that use relays, I'll use a diode, just in case.
Ahh thanks :) hmm just asking if i use 6v relay? how many ohms is needed? or same as 470k?
Well, use 220k instead and it should work fine. Or you can just use two 470k connected in parallel.
but sham ko ek samay aisa aata hai ki.. light bahut tej on off hoti hai.. uska kya
How many bulb can we connect to this circuit ? Can we connect 3 bulbs . What is the minimum and maximum watt of bulb to be used plzz reply.
Will any LDR work? I can't find LDR07. Will a GL5528 work?
Hi, I think GL5528 should work fine, specs look very similar.
I want to make for LEDs which works on 12v.....so can we use this relay for 12v output???
Yes, you can control any device with the relay, bulb or LED it doesn't matter.
Sir can i use bc548 transistor instead of 2n700? And what kind of resistor can i use if its allowed to use bc548
Hi, BC548 and 2N7000 completely different transistors, theoretically BC548 may work but I didn't test it. BC548A, BC548B or BC548C will behave differently because they have a different current gain. Well, you can try to choose a value of the resistor experimentally. And of course, BC548 and 2N7000 have different pinouts, so you need solder it correctly before turning the device on.
Hi, how can I power it directly with 220 v instead of 12 volts, obviously using a 220 v relay. Thanks.
Hi, no, it will not work like that. First of all, it needs DC, not AC, also that MOSFET can't handle more than 30V.
good job but use protect diode on relay
th-cam.com/video/5kjtiY9gxGM/w-d-xo.html
Will it work if i use 12vdc bulb and 12vdc supply. I would like to use it in my motorcycle.
Yes. I am just a little concerned about the stability of the voltage in the motorcycle (when the engine is on), it may have some impact on the stability of this device. Anyways, tell me if face any problems.
wow nice video
In u'r video u used 1 bulb n in u'r comment 12 v relay could received wattage max 120 W with 10A. So this circuit suitable for home circuit with of wattage max bulbs (led lamp) equal 120W , spec relay 12v 10A. Isn't it ?
12V marking on your relay means the voltage for the coil of the relay, but the contacts of the relay can work with much higher voltage, 250V in my case. The wattage depends on the voltage. The contacts of the relay can handle 10A max, but Watts=Volts*Amps, so if you going to use 12V instead of 220V as I did, we have: 10A*12V=120W, so YES, in this case, the relay can handle 120W max. But if you use 120V for example 120V*10A=1200W so ten times more... in both cases the current is not more than 10A, but wattage 120W vs 1200W.
Nice work but why we need to use a resistor
Resistor and LDR together make a voltage divider, since the resistance of the LDR is not constant and depends on the amount of light, we have different output voltage from the divider.
(Very approximate output voltage from divider: in light 1V, in dark 9V)
The voltage from the divider drives the MOSFET, and when the voltage becomes higher than 2.5V the MOSFET starts to conduct electricity and starts to power the relay, and the relay turns the bulb on.
Short answer:
Without the resistor, the light will be always off.
And the opposite: without the LDR the light will be always on.
Electrical Projects [Creative Lab] thanks alot brother
please do we use an other kind of transistor for that project?
You can use other N-Channel MOSFET transistors for this project, for example, IRF540N, or IRFZ44Z, etc. I think that it will probably work with bipolar transistors as well, but then you need to choose a correct value of the resistor.
THANKS AGAIN
Hi sir , if i turn 12V relay to 5v relay and DC is 5v as well, the R1 will be how many ohm ( Ω )?
Hi, it will be probably about 220K instead of 470K, but I did not test it with 5V, so I can't say for sure. (sorry for the late answer)
it's okay. thanks.
Ok very good, but the relay can't holding to long time
How about if I use a 220 supply.Am I going to change my electronic components?
What exactly do you mean by 220V supply? You need a regular AC to DC power supply. The power supply should be with the input of 220V AC and the 12V DC output. If your power supply can provide 12V DC then no need to change anything in the circuit.
Thanks sir. But what if I have a load which requires a 220 v.system?
In the video, I've used 220V light bulb, so no problems here. The relay can control 220V devices as well as 12V devices, the relay can control anything.
Thanks for sharing sir.
muito bom fiz um pra mim parabens otimo video.
Plz make aromatically upper deeper system in vehical
Very good
Make more projects with aurdrino too
I thought about that, maybe I will make some projects.
so if the bulb & the sensor cannot be proximal this would only work outside and not in a room
Hi, if you want automatically turn the light on in a room, the sensor (LDR) should be Installed outside. If it is not possible to instal sensor outside, then we should somehow make this device differentiate the light from the Sun, and from the light bulb. I know that daylight has a lot of UV, so if we cover the sensor with some kind of UV filter, then it probably will only react to the light from the Sun. But it is just my thoughts.
very nice and simple, but please do *not* use bare mains wires like that. Rather, either get a PowerSwitch Tail or a special one socket extension device that has this type of circuit in it, plugs into the wall and has a socket output to drive any mains device. Use this circuit for LED strips only, for your own safety. They're just as bright, can easily be controlled by a relay and use 12 volts.
THANKS!! IT WORK!! YOU CAN TO USE ALSO TRANSISTOR EQUIVALENT: BC558.
Hi, actually BC558 is not equivalent to 2N7000. To make it work with BC558 you at least need to choose correct value of the resistor, and with a BC558 transistor, you'll also need to reverse the polarity of a power source, because it is PNP transistor.
can i use any npn transistor?
Probably not any, but you can for example try BC547 or similar NPN transistor. I did not test it with NPN transostors at all, so I don't know if it will work, feel free to experiment.
Can I use C828 instead of BC557
is it work with dc 12 volt bulb and 12v batery source?
Yes.
THERE ARE MANY TYPES OF 12V RELAY..LIKE DPDT SPDT SOMETHING.. WHICH ONE DID YOU USE IN THIS PROJECT?? CAN U REPLY ASAP BECAUSE I HAVE A SCIENCE PROJECT TO DO..
Hi, I've used 12 Volt JZC-20F relay. It is SPDT NO + NC relay. You just need to find a 12V single or double pole relay, with one (or more) normally open contacts pair (NO).
Thank you!!
one more doubt
Instead of a 12V power source can i use a transformer to get tat 12V power??
Yes, but, transformers give AC, but this device requires 12 Volt DC. So if you want to use a transformer you need to use AC to DC converter (diode bridge and a capacitor). But I think it will be easier just to find a power adapter that provides 12Volt DC right away. Btw, the power adapter in the video was the power adapter from my router.
THANK YOU !! GOOD JOB.. IT WORKED :)
very beautiful
Can I used LED instead of bulb by using the same component?
Hi, yes, but you need to use appropriate voltage (and limit current if it is required.)
Hi its nyc ..Actually i need oppsite .mean while its light then switch get on and in dark switch get off.Please let me know how can i achive this ?
Hi! Just use NC contacts instead of NO contacts of the relay, and it will work exactly like you want. NC - means normally closed contacts, and NO means normally open contacts.
Can I used in the circuit my hone purpose plzzz tell me
Easy and simple 😃
your project is excellent but finally do more thesis for low light working (this circuit is not good working in low light) relay switch does not fully work in low light or dark... evening and morning time do not come too dark & light.
pls develop your project with IC & Variable Resistor
thank you.
You can try to replace R1 with a variable 680K resistor, and you will be able to change On / Off threshold. But if the problem that this device needs too much darkness for turning on and too much light for turning off, it is because of hysteresis of the relay. To fix such problem a modification of the circuit is needed. Probably the best solution is to replace 2n7000 with TL431, and chose a correct value of R1, or replace R1 with a variable resistor.
Will 12v relay run in 9v battery? Because my project didn't work.
Hi, I think it depends on a relay. I've just tested my relay and it can even work with 8V, but for your relay 9V may be not enough. Just connect the coil of your relay to the battery and test it yourself. But I think in order to work reliably 12V relay needs a 12V power source.
I am little bit confuse. If we setup this on street lights then street light will be start blinking at the time of sunset I/O fully lighten? What is the solution in this case?
Hi. You just need to set this up in a way so it mostly sees the light from the sun and not from the street lights itself.
If it detects light from a street light that you try to control it will start blinking at night... it is because when it is too dark (in the evening) it will turn lights on, but with those lights on it is too much light so it thinks it is day and therefore turns lights off, but when lights off it becomes too dark again, so now it thinks it is night and turns lights on again, and it repeats again and again, and that is why it is blinking.
Electrical Projects [Creative Lab] You mean LRD will ignore the other street lights and will only observe direct sun light. Anyway let me try to experiment this at my backyard. Further is there any possibility to connect solar panel instead off LDR. I think Solar panel can do this job with more perfection. What you recommend?
You will not have any blinking if it senses light from other street light, but it will not ignore light from them. The light from the sun usually is much stronger than the light from street lights, so it may work fine, but it depends.
You can also try to put LDR in a box in a way that it only detects light from above (the sun or the sky) and not from sides...because probably the light from your and other street lights go from a side.
A solar panel also may work fine, but again it depends on the size... it should provide enough power for the relay even on a cloudy day. The clear advantage here that you only need a relay and a solar panel, and nothing more... I also had this idea with the solar panel but I did not test it.
Electrical Projects [Creative Lab] Thank you so much for all the help. There is much Electricity issues in my country and usually peoples are here careless. This project will help a lot to change the behaviour of my neighbours. GOD Bless you.
Good performance sir
ye instrument kaha miles or kya bolna hoga
can i use a light bulb and a 220v AC power source?
it depents on the relay you use
Kya iska kai matcher transistor agar ho to plz share
Sir? about resistor you used? how many watts?
I've used 0.25W, but you can use for example 0.125W, it doesn't matter here.
can i do it with dc current?
very good project but no use 12 volt direct 220 volt Ldr video
fire alarm k bary men kuch gide dajeye plz
Sorry but you have not display the transistor & resistance & relay & Dc power supply ?
what is the cost of one unit
Can we make with 220 AC
dear sir. can i use relay 9v for this project.
Yes, but the power supply should be 9V as well.
Hi can I use PN2222 in this circuit
can i use relay in motor parts?
can we use it continououslu]y for more than 12 hours???
Yes
can i connect dc bulb with 12v dc potenial insted of a ac bulb with ac current?
Yes, with this device you can control any bulb, (and not only bulbs) and doesn't matter what current DC or AC, also doesn't matter 12V or even 250V.
But for powering of the device you should use 12 Volt DC only, just like in the video.
thank yo so much for your response
Change resistor value for 5 volt circuit provide a value plz
Hi, I think 220K resistor should work fine. And of course, your relay should be 5V also.
What is the specification of relay?
Reply Plzz.
12V 15A, coils is 400Ω, in the video I use NO contacts of the relay.
@@ElectricalPro What will be the cost of this relay and where do we get it ?
This project is work on dc power ?
Hi, yes, you need to use a 12 Volts DC power source for this device. But this device can control any lights, doesn't matter AC or DC.
Yes sir
akash singh
th-cam.com/video/hOVM0dOdR68/w-d-xo.html
hello sir this version DC 5v
@@ElectricalPro motorcycle???
All this to keep a light bulb in a closed box?
It is just to check that everything works. It is all because sensor should not sense any light from the bulb that it is in control of.
Sencar banane maye kiye kiye lagta hai please bataye
Extend your cable of the light bulb far away from the sensor.
hallow Mr i have tried myself bu the sensor sensing only light instead of dark so what should i do
You probably using NC contacts of the relay, you need to use NO contacts.
@@ElectricalPro i also use on normally open but still the same
plz help me
It cannot be the same. Can you clarify what do you mean by "the sensor sensing only light instead of dark"?, if you meant that it turns the light bulb off in darkness instead of turning it on, then it means that you are using the wrong pair of contacts (NC instead of NO).
It is easy to check whether you use the correct contacts or not. To check it just disconnect wires to the coil of the relay, after this the lightbulb should be off, if it is still on it means you are using NC instead of NO.
@@ElectricalPro I USE TO CONNECT IN NO BUT STILL TURNING OFF IN DARK
What is the rating of the bulb used.
230V 75W. But it doesn't matter, you can control any bulb you want.