How to wire up magnetic switch in-line with a LED strip (reed switch)
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- เผยแพร่เมื่อ 8 ก.พ. 2025
- This is how you use a reed switch in-line with LED strips to turn them off and on when a door open and closes. These are the reed switches I use from Amazon amzn.to/2OvDCMp
This is the same why I wired up my gun safe. See the video here • LED lighting for gun s...
If you have higher current loads, watch my video how to do it with a reed switch and a relay
• Wire magnetic reed swi...
Finally found a simple and well explanation of these mag switches! Thanks!
Great! Glad it helped.
Just what I was looking for, thank you so much sir..
I have an idea for a hidden vehicle kill switch using a reed switch and a relay for the starter solenoid but am a complete novice regarding electrical engineering.
Basically glue a reed switch behind an interior panel that breaks the normal circuit from the ignition switch to the starter, requiring not only the key, knowledge of the kill switch location and a magnet
Naturally it’s not completely theft proof, but it adds a significant level of complexity and time to the process
Seems like a cool idea too, not sure how to fully accomplish the task though, your videos do help with my understanding of how everything works though.
You just made my year. I can’t thank you enough! 🎉🤗🥳🥰
Wow, whole year? Glad it helped. 😉
thanks for this! exactly what i was looking for. so many vids out there that do led strip lights with remote but not for this specific setup. i need it for sliding closet doors. i'm looking to setup 1 for each door.
This was really helpful. But what if I used a Normally Open switch instead of a NO/NC switch?
Thanks for posting this, it was very helpful.
Thank you. Well explained. 👏👏
thanks .from Algeria
Right, ok. I'll check it out.
This is the closest I've found on how to create (simply) a light that turns on when the magnets come apart. I wonder if this would work if the power supply was a battery pack? I am creating a little treasure chest that when opened, the light turns on, and when the lid is closed, the light goes out. It has to be portable, hence the battery pack.
I am literally building the same thing for my daughter. Right now the lights are controlled with the cheap controller that comes with the LED strips. Did this workout for you?
I'm thinking of using this set up for my car doors. I know I could run an add fuse to my interior but I think the door switch itself is faulty so I was going to do this instead. I just need to match up voltage and ampage amounts with the Reed and the supply
Thank you!
The reed switches you use have a current rating of 0.5A. Most light strips draw more than that, so this is not safe. It's okay with the demonstration setup, but people may make false generalizations.
Thanks for the feedback. I do have a high current video using a relay. I will add a link to in in desc.
th-cam.com/video/aPXJhUfEgNw/w-d-xo.html
Can you recommend a little better quality one that can be used outdoors ? Thnaks
Hi. I found this one. amzn.to/3sxi0DH
I haven't used it, but seems to be sealed for outdoor use.
@@mattadata2 Great, thanks so much for your reply. I think you're the first person that's ever replied to a question I've asked. I tried to get the relay off of amazon off of your link but they're no longer available. I found elsewhere but but takes pretty long time to get here. I put up an electric solar gate and want to wire up a blinking light running from Solar . I was wanting a magnet switch to trigger the light so I'll know when the gate is opening at a long distance. Thanks for taking the time to answer and for doing great videos explaining this.
@@thomasj.dubberly5480 Glad to help. I will see if there is similar relay and change the link. Sounds like a good project! Good luck.
@@thomasj.dubberly5480 2 pack of similar relay. amzn.to/3aVoENS
@@mattadata2 Thanks a lot for the link. I just pulled the trigger on those.
Can we arrange this to cut the power to the power supply unit instead? Otherwise, the power unit will consume energy all the time which is not too cost effective as I see :)
Can't use a reed switch for 120V AC. You could do it with the addition of a relay....but that would draw a little power also.
Here is a video with a reed switch and relay.....although not exactly what you were asking. th-cam.com/video/aPXJhUfEgNw/w-d-xo.html
Not sure if you’ll read this. How do I know how long of a run is too long for a Reed switch? I’m planning to install one in a small closet. I will be using LEDs instead on an overhead light, and I want the Reed switch on the door to turn on when I open the doors.
I will read it :)
The higher the voltage, the longer you can run it.
But you might want to use a relay so you are not carrying high current long distance.
Check out my other reed switch video with relay. th-cam.com/video/aPXJhUfEgNw/w-d-xo.html
I'm trying to have light hook up to my service bed truck and I have 6 tool box doors can I connect them all together and each door will have power to them?
Yes. Just make sure to hook them up in parallel, not series.
Could you wire this up the opposite way, to have the light turn on when the magnets are together?
Yes. That is what the other screw is for.
Move the wire from NC to NO screw.
Would this be the same exact setup for a small 12v buzzer? I plan on installing a buzzer alarm in my van if I leave my solar panels upright when I start the vehicle. thank you for posting the video!
Yes. Should be same. Good luck!
@@mattadata2 wonderful! I appreciate the help!
can you replace a 250V AC, 50/60Hz, 2A switch for a magnetic switch? I do not know anything about voltage or anything electric.
Wait I’m confused. If its wired NC, wouldn’t that mean power is flowing because you have the magnet on the switch?
It is confusing. But he does indeed have the circuit wired through the NC path on the switch if you zoom in. I guess for reed/ magnet switches the normal mode behavior is defined as what the switch state is when the magnet is NOT acting on the sensor. In other words: the normal mode is when the switch is “inactive”, or the magnet is apart from the sensor. When you think of it that way, then it makes sense.
What size fuse would be needed for LED light and magnetic switch?
Depends on what type of LED strip, how long, and voltage.
60" LED truck bed lights run on 12v, with 5amp in line fuse. Switch 100volts on 0.5amps. So maybe changed in line fuse to?
I also have a on/off push button switch that is 20amps,12volts. Trying to hook magnetic switch up to tailgate, so when I open tailgate LED light comes on. And also have the option for the push button switch.
@@derkb8087 Got a link to the exact LED strip? My fear is that is too much current for that magnetic reed switch. A few seconds at a time would probably be fine....but if you leave it on for a long time, that magnetic reed switch would heat up and potentially melt.
12V at 5 amps is 60 watts.
Check out my other reed switch video that shows how to use the reed switch to control bigger loads with a relay. th-cam.com/video/aPXJhUfEgNw/w-d-xo.html
I need to see what kind of LEDS they are to see how much power they use. 5050 or 3528....and how many leds per foot or strip.
Im doing my just like this, i yave thr same setup with relay. th-cam.com/video/_Lur3p11gGE/w-d-xo.htmlsi=3AGTWdsnigGk0u20
Is it possible to do the opposite, to have the light turn on when the magnet is close?
Yes. That is what the NO and NC screws are for. They do the opposite of each other.
I'm a general hobbyist, looking to make a wall mount for my Electric Bass that lights up when the bass is on the wall and turns off when I grab it. This is perfect for that, thank you!!
Cool project! Post back with some video when complete!!
Is there a way to have the light on with the magnet/ door closed?
Yes. Just hook the black wire to the N.O. screw instead of the N.C. screw.
@@mattadata2 wanting to wire these to turn lights on when magnets are away/door open but still be able to turn lights on when it’s closed through use of another switch. Switch I’m talking about is a 3 way switch just didn’t know if it was possible and if so how.
Can this be used to complete a ground signal only? Adding an alarm in a trailer and the alarm trigger input is a ground
Sure. Don’t see why not.
CAN I CONNECT THIS TO DIRECT AC LINE 240 VOLT ?
No. Don’t do that. You need a relay for that.
Hello, maybe you can help me out. I have a security gate at the end of my driveway. I can't see the gate from inside my garage, but I want to know when the gate is open and when it's closed, also from inside my garage. I open the gate in the morning and close it at night and have to walk out to make sure it opened and closed. I need a way to wire up switches on the gate, without wires running all the way to the garage that's over 250 feet away. Any thoughts?
Hi. I think a wireless door sensor would be perfect. I have the Wyze ones and they work great. It would require a Wyze Hub. Not sure about weather proofing. I am sure there are other versions of similar for outside use.
@@mattadata2 that’s what I was thinking. I have a door bell on my mailbox door. When the mailbox is opened, the chime goes off. I may do the same with the gate, but I’ll need to figure out how to wire in a light and turn off the chime. No one wants to listen to a chime all day. Thanks!
Any luck with the Wyze?
I have a sliding gate at the end of my driveway & this is what I’m looking for. Was thinking about putting a small (~1ft) led strip on the post I can see from my house: when the gate is closed, the lights are on (green).
(Would love to have the lights be red when the gate is open & green is closed), but this is a great first step??
@@mangoman692 that’s kind of what I wanted to do as well. I ended up putting up a wireless solar powered camera pointed toward the gate and an Echo Show 8 in the house. I also have a remote in the house for the gate and I press the button and tell the Echo to show me the gate. It works perfectly. I can check it on my phone or the Echo any time I want. The camera also records any movement in the driveway. I’d highly recommend that system.
@@terryjones8360 - cool! I don’t particularly want/need an echo show. Am trying to keep it in the apple ecosystem. That being said, I’m running Homebridge to get stuff that’s not HomeKit enabled. Lol
Hi can i use this switch for air curtains?
Yes, but I think you will need to add a relay. Not sure how much power an air curtain needs, just make sure the relay you pick can handle it. Here is how todo it. th-cam.com/video/aPXJhUfEgNw/w-d-xo.html
I'm confused. Just bought ten closed Switches like this that say you have a open switch and not a closed switch. Research it. Seen other that showed the same as you, but on ebay, the sellers are showing just the opposite.
Not sure what you are talking about. The switch in this video has a screw for both OPEN and CLOSED. So you can set it up either way.
NORMALLY CLOSED means if nothing is acting on the reed switch (such as the magnet), then the circuit is CLOSED (meaning ON).
The main problem with these reed switches is that they are all low current, around 0.5A. 🙁
LED strips of any decent length draw at least a couple of amps, typically
Which is exactly why I made another video with a relay th-cam.com/video/aPXJhUfEgNw/w-d-xo.html
does the reverse also exist?
no magnet = closed contact
with magnet = open contact
Yes. There are 3 terminals. Switch the wire between the NO and NC terminal.
@@mattadata2 hey! i'm really new at this and i'm looking to make a prop where the light would come on when the switch is in contact with the magnet - is the "reverse" you guys are talking about how i'd accomplish that?
Yes. Just change the wire between NO and NC (or the other way around)
may i ask if how many voltage is ur power supply?
12 volts
Can It be wired to give ground when door open to activate a car alarm
How im do to conect mor than 3 switch magnet
What is the power supply you are using?
Verhooft - it’s a very old 12V bench power supply I got at Radio Shack years ago.
What size wire do I need to use?
It really depends on what your load is. Just a few LEDs and short distances, 18AWG should be fine. High loads and longer distance, you need larger diameter wire. There are lots of charts out there to help you figure it out. www.engineeringtoolbox.com/amps-wire-gauge-d_730.html
Could the power source be a small battery?
Yep! I have seen some people use this rechargeable battery pack. amzn.to/2GoBTWj
D you know a magnetic switch which doesn’ contain Reed switch?
No, I don’t.
Is should't be NO?
It totally depends on your use case. Do you want the light ON when you OPEN the door? Or do you want the light OFF when you OPEN the door? Both will work, it just flip-flops the state.
how would I add an on - off- on switch to this to allow me to either turn the lights on all the time, have them off, or have them switched by the reed switch?
Get a switch that has 3 positions and wire it in front of the reed switch. Position1: reed on, p2: off p3 on.
I tried this set up and the Reed Switch keeps blowing out. Some reading indicates that the current is too strong for the reed switch and a relay or transitor or some other device is required to prevent this. Any suggestions?
Hi. Yes, it will blow if too much current runs through it. What are you trying to power? I power about 13 feet of 5050 LED strips in my Safe video and it has been working fine for years. I think this relay will solve your problem. amzn.to/2xp4qqS I just ordered one and will do a video on how to hook it up.
Here is the new video on how to use a relay so the reed switch won't burn out. th-cam.com/video/aPXJhUfEgNw/w-d-xo.html