HI, I would like to know if there is a solenoid that will retract when power in one direction is applied to it and when the current is reversed, the solenoid sticks out again. THANX VERY MUCH IN ADVANCE, i look forward to reading your answer. Ahmad

Asked by in06khattab 8 years ago  |  last reply 8 years ago


Im trying to make a airsoft  gun with a solenoid. but im having trouble making a solenoid can someone please help me on how to make it

Posted by minecraftpotato 4 years ago

Solenoid vs actuator

I'm planning on adding network capabilityto my current remote car starter (like the viper systems) At first i was thinking of hacking a remote and connecting it to my microcontroler. But since the spare remote cost 80$ I chose to go out with a mechanical pushing of the button instead, at least for the prototype. Considering the following facts, what do you think i should use? The solenoid/actuator must operate at -22 f (-30c) I dont want the thing to smash the remote too hard and break it Thanks

Asked by gazoutg 3 years ago  |  last reply 3 years ago

How to control a solenoid? Answered

Hi, I have a tiny solenoid from an automatic air freshener that I want to control manually. The solenoid acts as a valve that opens when fed 5v, and closed when no voltage is present. On the factory board, there's a timer that triggers the solenoid every few minutes for a fraction of a second (opens and closes so fast it just sounds like a click). What is the simplest way (No Arduino, Raspberry, etc.) to make a 5 volt pulse to make it go "click" on the push of a button?  Further more, how would I control the length of the 5v pulse?  I want to be able to control the amount of gas it passes (Pun intended) when activated. Any information would be helpful, and a circuit diagram would be greatly appreciated (I can read diagrams but can't design a circuit). Thanks!!!

Asked by Morgantao 5 years ago  |  last reply 5 years ago

Explain me how to make an "Electromagnet Solenoid" more powerfull

I bought something like this off Ebay: Turns out it wasnt as powerfull as i need it to be but it has the right amount of travel and is nearly perfect in size... Notice that the body where the coils are is fairly short. What if i made my own? But MUCH longer body, (theres plenty of room in my aplication LENGTH-wise) will it get more powerfull? Can i make it more powerfull by adding more coil? Turns out i have plenty of coil like the one used in my solenoid, i have plastic pipe similar size and i can CNC the central "plunger" rather easy as well. Or make it different shape etc... The solenoid i have has a metal body, does that affect how strong the solenoid is?  The coils are wrapped around a plastic tube, the plunger is rather loose inside it and the tube could be thinner. Will thicker plunger and thinner tube improve the power? Im using a 11.1V lipo battery, something you can find in RC-cars. Increasing voltage/amps IS NOT AN OPTION.  So, in simplicity, if i make a solenoid like mine, but longer, can it pull greater load than the original or do i need to do something else as well? The actual aplication itself in simplicity is the solenoid pulling certain object back around ~10mm AGAINST a spring, not very powerfull spring might i add. It pulls the object back, then lets go. It will be controlled via a circuit later but right now just a battery and nut-job holding a red button. I just need a solenoid powerfull enough to overcome the spring. The object needs some force  to return to its position so putting in a smaller spring is not an option eighter.

Posted by peelo 2 years ago  |  last reply 2 years ago


Hello sir,  Im intrested in solenoids feild and wanna have practical experince in that.can you please tell me how to generate electrical charge by using solenoids and storing that charge in mica capacitors with less voltage rating high storage capability..which also has slow discharge. The time of storing the charge should be high.Hope will guide me. Thankyou. Raghudeep,

Posted by RaghuC 3 years ago  |  last reply 3 years ago

can i make a solenoid out of these materials? will it work? school project pls help?

I have 50 meters of uninsulated copper wire 20 gauge. I want to make 4 solenoids out of it, yes i know i need magnet wire or insulated wire but they don't sell it where i live (Mississauga, Ontario, canada) so i was wondering if i can use electric tape (vinyl electric tape) to insulate the uninsulated wire and use it to make solenoids. first time on instructables so i apologize in advance for any mistakes in this posts. Oh and the metal object needed inside the solenoid that goes in and out (idk what its called) can i use canadian pennies and apply hot glue to make a long rod? would that work? i don't need the engine to push anything heavy i just want it to work.  Thanks

Asked by ZaidA10 3 years ago  |  last reply 3 years ago

how to make a good relation between magnetic fields that formed by electric fields and magnetic force ?

How to make a big magnetic force if we have a Direct Current battery, a solenoid, a magnet?

Asked by puteri salmiati 9 years ago  |  last reply 9 years ago

Electro Magnetic Core Solenoid

Dear Friends, I need to lift a weight of 100 grams or 500 grams weight using a solenoid. I can use any current DC or AC. What is the procedure for calculating this. Please help me. Ramanathan PS INDIA

Posted by RamanathanP 4 years ago  |  last reply 4 years ago

Low voltage Push Solenoid

Hey everyone... I've been trying to find a DC push solenoid powered by 12V or less (I think 9V would be best). It needs to be able to push down on point and shoot camera trigger so I'm estimating about a half pound push minimum. I saw some time lapse modifications on the Make: photo pool. I'm going to do the same, but with simplicity in mind :P

Posted by trebuchet03 11 years ago  |  last reply 9 years ago

rewind Solenoid? Answered

Dear All .. My original solenoid winding by awg 30 magnet wire,  now I would like to  rewind new  with 2 x awg 33 So please help me to know : -The new (2x awg 33 )  they power as identical  as  1x awg 30  magnet wire? Thank you so much .

Asked by lam.huuminh.3 2 years ago  |  last reply 2 years ago

do you have an idea about 2way multi-purpose solenoid valve?

Posted by ghen 8 years ago  |  last reply 8 years ago

Using a Push Solenoid as a finger press to start video game console...Help please

Ok guys so Basically I have a plastation 2 console in my arcade machine, I want to be able to turn it on via a arcade pushbutton on the outside of my machine. The idea I have is to use a linear push solenoid to act as a finger to press the power button on the front of the ps2 everytime i press that pushbutton........ Is this possible? what type of push solenoid do I 12v? size etc.... and can I use a momentary contact pushbutton to power on the solenoid momentarily to do a single press of the playstation 2 power button? Thanks for any help... P.S. I have very little knowledge of robotics or servos and solenoid usage....but I can solder, wire, etc....

Posted by Negativecreep0 9 years ago  |  last reply 9 years ago

How much power to control 3 x12V Solenoids?

Hello! :) Newbie here (and to using Arduino). Sorry in advance for the dumb question: If I'm using an Arduino uno to control three 12V push-pull solenoids, how much external power do I need? I tried using  3-12V power supply to control 1 solenoid only, but it didn't work.  FYI, in the circuit I'm also using: - TIP120 transistor - 1N4004 Diode - 1K resistor (don't have a motor shield to replace all of the above..) Not sure where I'm going wrong. Could anyone help me please? Thanks! 

Asked by Joanne55 3 years ago  |  last reply 3 years ago

Looking to replace LEDs with solenoid driven indicators.

I'd really like to replace some LED indicators with physical on/off indicators, like they used on old NASA spacecraft. To see what I'm talking about take a look at this console from Apollo 14 at the little windows above the switches at the center left. The top row is all "barber poll" the bottom row open.My initial thought is that I could possibly replace the LEDs with a solenoid that would shove an "on" indicator into a little window when powered, and retract it when powered down.The problem: I know next to nothing about solenoids and don't know if this is feasible. They'd need at least 1/4" throw and to run at low power if they're going to simply be a drop-in replacement for LEDs. What kind of solenoid am I looking for and does it even exist?

Asked by Grathio 9 years ago  |  last reply 9 years ago

Need a controller (or program) for low voltage solenoid valves, programmable to have a station stay on for days @ a time

I have 16 solenoids that need controlling to open air valves in sequence that create bubbles in a fountain that simulate moon phases.  Would like something that is stand alone hardware over a program that would require a computer to be on 24/7. 

Asked by Brent Owen 6 years ago  |  last reply 6 years ago

Should I use a remote-controlled solenoid to tip something over?

Hi all, I want to be able to remotely tip a model face over when my friend walks in the room (see attached photo). The face is made of cardboard and spray foam and is mounted on a piece of plywood that is hinged to the table. Should i try to use a remote controlled solenoid to pull this gag off? Any better recommendations? It should be remote but I could probably hide a wire if there is a different and more reliable system. All advice welcome!!!! Thanks, D

Posted by damianzuch 7 years ago  |  last reply 7 years ago

Electronic coin dispenser

I'm trying to build an electrically controlled coin dispenser (all the coins will be the same type). I have a metal tube -just the right diameter for the coins - mounted vertically, with a piece of wood horizontally at the bottom. There is a gap between them of approx 1mm, just enough for a single coin to be visible. I've been experimenting with using a solenoid to swipe a coin from the bottom. Rather like the image here: Solenoids aren't cheap, and I was aware that the weight of the pile of coins (I'd like to be able to hold around 100) would mean it needed to be fairly powerful. In the end I bought some cheapo solenoids from ebay (around $7 each). They are rated 2A and have a hold force of 20N - this seemed a lot more powerful than I could find elsewhere for even 10 times the price. Given how cheap they are, I could even use two in parallel if I still need more power. I'm using coins with a 20mm diameter, but after the solenoids arrived I realised they only had a 10mm stroke - obviously not enough to fully push the coin away. I've tried using the solenoid to pull a lever, but this doesn't seem to work very well. Previously I'd also tried a stepper motor linked up to a disk with a coin-sized hold cut on it, rather like this: That worked pretty well but was very slow - it would take 3 or 4 seconds to dispense each coin. So, I'm looking for a bit of advice. Would I be better off splashing out on a more expensive solenoid with a 20mm+ stroke? Am I approaching it the wrong way?

Posted by psmith37 4 years ago  |  last reply 4 years ago

Is there a way to turn a pull solenoid into a push solenoid

I bought a powerful push solenoid for part of a Halloween project, but when it arrived, i found it was a mislabeled pull solenoid... Is there a way to convert one to the other?... otherwise, is there a source of 24vdc push solenoids with a 1/2" threaded mount that will ship overnight?

Posted by gschoppe 10 years ago  |  last reply 8 years ago

Controlling Solenoid Valves from a Computer?

How would I go about controlling a few solenoid valves from a computer? These valves run off of 120v source. I understand the question is vague, but anywhere to start me off would be great. Thanks, Austin

Asked by Newman180 8 years ago  |  last reply 8 years ago

How to connect a solenoid valve to my water container? Answered

I have a setup in my mind, consisting of a plastic bottle(filled with water) with a male threaded neck. This bottle is sitting upside-down so the threaded neck is on the bottom. I want to transfer this water to a cup(by freefalling water) through an electrically controlled solenoid valve. The problem is, the plastic bottle I have picked out has a neck outer diameter of 1-1/2 inches, and assuming I want to directly connect the solenoid valve to the neck, I need to get a 1-1/2" diameter valve, which is above $100. Is there any way to connect this container and a valve(still not picked out) without that high a cost? Maybe a reducer of some sort(i looked but cant find any with 1-1/2" diameter on one side)?  Thanks guys, and sorry if the question is kinda weird and simple. For a reference, check this project. What i want to do is similar,but instead of using a pump, I want the water to freefall into the cup.I'd like to eliminate the tubing too.

Asked by Chris414 5 years ago  |  last reply 5 years ago

Where to source Pneumatic solenoid valves in Canada?

Hi, Does anyone know where to find miniature Pneumatic Solenoid Valves in Canada? I have only been able to find rely cheap low quality ones from china or really expensive ones from America. Something in the middle would be great! Thanks

Posted by IanS160 2 years ago  |  last reply 2 years ago

Solenoid secrets?

Folks, I recently purchased some inexpensive 110Volts AC solenoid coils from China through eBay (of course.)  As I understand solenoids will convert electricity into linear motion.  I have been unable to do that.  I tried ferrous rods as plungers, they get stuck inside the walls of the coil's cylinder.  No ferrous material like aluminum rod did not work at all.  Can someone please guide me to make it work.  I purchased 110 Volt coil thinking that it will create a stronger field, I don't feel the strengths of magnets to be rather weak. 1. The coil gets hot when energized.  Will it burn out if I keep the solenoid energized for 4-5 minutes? 2. Should I go for a lower voltage DC coil? 3. What happens to the dc coil if energized for long time? I would greatly appreciate your comments. Thanks.

Posted by kabira 6 years ago  |  last reply 6 years ago

solenoid valve control

Hi, im wanting to build somthing simple to control the heater control valve on my fiesta. its a simple solenoid valve at 0v its open(hot) at 12v(14.4v) its closed(cold) the propper control board uses pulses to control the valve, the board has since given up and im left with a very hot car, now i thought a simple way to sort the problem might be to use the 10k pot on the control board with a MOSFET and just vary the voltage going to the valve. will this have the same effect on the valve?

Posted by stevelee10 6 years ago  |  last reply 6 years ago

Device for touching a touch screen? Answered

I need a type of solenoid/servo device capable of moving a few millimeters at a fast speed. I am building a device that will tap a touchscreen for me via an electric signal (In this case, and arduino.) they need to be relatively cheap and small. I will have four of them evenly spaced over four inches (They need to be no wider than an inch, would much prefer they be less than a half inch in width. Height isn't important, and length should also be under an inch.) They also need to be fairly weak, i dont want one of them punching a hole in my tablets screen by accident. Doesn't need to be controlled by PWM, either off (Not touching) or on (Touching) will work fine. Please do leave links along with the name of the device/part.

Asked by RocketPenguin 4 years ago  |  last reply 4 years ago

Camera flash magnetic cannon?

Is it possible to make a strong magnetic cannon using camera flash units? I've read about some instructables that provide instructions on using several capacitors connected in parallel to provide higher current, but I'm really skeptical about the performance of such a cannon. Can anyone make an instructable and provide video evidence on this??

Posted by Boppo3 8 years ago

Programmable solenoid controller

Hi all, I need some help finding a suitable solenoid controller, it must be dc powered and operate a latching solenoid for an hour every 24 hours. It must be programmable by the user and operate the latching solenoid instantaneously on and then off separately. It should be relatively cheap as its for a HNC lawn watering project. Regards woody.  

Posted by woody1001625 5 years ago  |  last reply 5 years ago

Push/Pull solenoid on a switch or a solenoid valve? Answered

Hi, I have an air supply and, thanks to iceng, a rapidly pulstating (variable speed) 12v Dc power. I would like the air supply to allow through a set amount of air each time. I already have a mechanical switch that works perfectly, allowing the exact amount of air through, I need this air switch to be opening and closing as quickly as possible. Would I be better of using a push solenoid and setting it up with the switch or do you think I will obtain faster speeds using a dedicated solenoid valve? I was looking a this solenoid. (or something like it Though i am not sure about the valve version. Any advice/recommended solenoid (valve or push-pull) would be very helpful. Specs: 4mm pipe (ext diameter) 2mm (int diameter) 6 bar (preferably have the solenoids as small as possible) Thanks

Asked by Digital Flame 3 years ago  |  last reply 3 years ago

Electronic Box Lock Help!? Answered

OK so I would like to use a solenoid to unlock a box from the inside, problem is the electronic circuit I designed inside the box operates on 3 vdc and as far as I can tell most solenoids operate on a voltage of 6-24 vdc. Is there any way to make a simple driver circuit for a solenoid so it can operate on 3 vdc?  Below is a copy of the box's circuit so far. I would like the solenoid to be in parallel with the "puzzle solved LED."

Asked by TXTCLA55 6 years ago  |  last reply 6 years ago

Need help to move a solenoid to sound

Hello all, I am working on a project where I need a solenoid  move to sound.  I was thinking of using an Arduino and a microphone to achieve it but I'm a little stuck.  The goal is to have music playing and have the solenoid move to the music.  I also want it to move to noise so that's why I went down the microphone route. Unfortunately after much searching on the net I've hit a brick wall. if anyone can point me in the right direction on how to do this, then I'd be a very happy person.    

Asked by lonesoulsurfer 2 years ago  |  last reply 2 years ago

How would I trigger a solenoid from a timer pulse, either from a 555 or the output of an electronic metronome?

Emphasis on cheap and easy. Small and portable (battery powered) also are big plus. Basically the solenoid- triggered either from a 555 or headphone out of a metronome (which would be easier?) would tap the table (or other object) to the beat. (I'd love to tape this to my drummers head!)

Asked by merrickhard 9 years ago  |  last reply 8 years ago

Suggestions for a cheap source of solenoids for a music project? Answered

I'm looking for some 'normally in' the would perform a striking action when voltage (pref. low) is applied.  I'm not above scavenging, ordering online, or building my own.  It just has to strike a xylophone and retract, so not a lot of force is required. Any suggestions?

Asked by NEIN 7 years ago  |  last reply 7 years ago

I'm looking for a pneumatic solenoid valve of a certain layout and not having much success. Can you suggest one for this

I'm looking for a pneumatic solenoid valve of a certain layout and not having much success, although I am CERTAIN it must exist and by the level of knowledge exhibited around these parts -someone here will know of one! Here we go, I need a really simple "normally open" valve with low current draw, small dimensions, good sealing, -in fact something very much like this type only normally open in design and capable of handing 18psi Do you know of a suitable design on sale for my project? Thank you for your constructive input and I hope the answer will help anybody else who is looking for a valve with similar requirements on their project :D

Asked by Fingermouse 6 years ago  |  last reply 6 years ago

CPU/555/mini chip circuit and coding help? Answered

CPU/555/mini chip circuit and coding help? You can probably tell I don't really know what i am looking for, I have a micro-switch and a 12v dc pneumatic solenoid (for air pipe valve) I need a cpu device to say, every time power is received, no matter how long short or even if I don't release the switch at all, wait a fraction of a second or so then release 12v dc for x amount of time (to the solenoid). What parts do i need for this and how will I program it? Thanks in advance, -Digital

Asked by Digital Flame 3 years ago  |  last reply 3 years ago

Are there any inexpensive ways to make a material flex/contract when an electrical current is applied to it? Answered

I'm working on a small-scale prototype toy and it would be nice to have the ability to apply a charge to a piece of material and have it flex or contract. I kind of see it working a bit like a mechanical solenoid (and that is a possible option here although they would have to be tiny!) in that if the material looks like ____________ to begin with, when you apply a charge to it it becomes like __/\__ (excuse the poor ascii art!)

Asked by ProfessorFalken 7 years ago  |  last reply 7 years ago

Need Help With Wiring Up Two Limit Switches?

I have a closure system with deadbolts that works on a sliding assembly with a solenoid that turns 180-deg to close and the other 180-deg to open. It is accomplished with two limit switches (as shown in the picture attached). My question is I have a single control button. If I press it once -- I need it to trigger the power in conjunction with one of the limit switches (to stop the solenoid at the appropriate time) and then on the next press of the button, send power through the other limit switch so it cuts power at the appropriate time. Obviously if I wire everything at once you have one switch open when the other closes and vice versa so power continues. My question is this. I believe I can use a 4017 chip to allow power to go to one and then the next with each press of the button. However it seems like overkill and I figure that there has to be a simple one-two power diverter switch of some kind that I can put between the button and the solenoid/limit switches so it cycles between the two. In other words. When power comes through it the first time, it routes it into limit switch #1, the next power cycle goes through to limit switch #2, and back and forth. Is there something simple like that. If so please share. If not, can someone please tell me the best way to wire up a 4017 chip for this purpose. As always, thanks in advance for any experience, advice and/or wisdom -- it is greatly appreciated.

Asked by pletchman 6 years ago  |  last reply 6 years ago

capacitors Preventing sparking

Im trying to build a sollenoid motor like this one;=channeland i need to no how to prevent sparking on the switch so that im not constantly having to replace it. ive heard somewhere that a capacitor will prevent a spark on the switch but will it? and how big of one will i need. thanks

Posted by budsiskos 9 years ago  |  last reply 7 years ago

Does anyone know how to connect Solenoids to a Arduino? Answered

Hi All, I'm working on a project and I was wondering if any of you could help me hook up a solenoid to an arduino so that I can control it using a button? The solenoid I'm working with is 24v dc with 6 watts Thanks  Aman 

Asked by amantux 7 years ago  |  last reply 7 years ago

how to use solenoid with Capacitor Discharge Technology?

Hello guys, i am on a project for a pcp air gun, i want to replace the hammer that open the air valve with electronic trigger, a solenoid to strike the valve open, the travel of the valve is maximum 3mm, a weight will be added to the solenoid to help with kinetic energy. the idea is to use capacitor discharge to activate the solenoid for a fraction of a second (to fire a burst of air propelling the pellet out of barrel) i have seen some electronic triggers using 67v 2200uf capacitor, just to give you an idea. now i want to control the solenoid force and duration. can i do that with arduino? sure i need an external circuit to power the solenoid, maybe like the disposal camera flash?? Please advise. thank you

Asked by gerarddag 4 years ago  |  last reply 3 years ago

Power supply for a strong solenoid (recoil simulator)? Answered

Ok, I need a power supply for a solenoid. It is to simulate the kick of a pistol. I need a power supply that is small, so that I can hold it in my hand without being to heavy to hold for a long time or it being uncomfortable. The solenoid will have a neodymium rod made of lots of 6mm*3mm neodymium magnets inside it. The coil is 5cm long with 0.8mm ECW and 7 layers although it can be rebuilt. The point is that I need something to power this coil and let the neodymium magnets hit the wall behind the coil (wrapped around a 6mm tube) and produce a sort of kick. The power supply needs to run on a roughly small power such as two nine volt batteries (dc). This is a long question but I would greatly appreciate any help. Thanks :) (I have a circuit to make it produce recoil (electic bell...) but how will I power it to be powerful enough!?) Thanks again!

Asked by Digital Flame 3 years ago  |  last reply 3 years ago

knowledge about wire which use in solenoid?

I want to make a solenoid & i am confused because i don't know that which type of wire is use which no or ohm . Actually i have a project in which I want to produce electricity  with the help of magnets or solenoid . So can u plz guide me this matter very gently  Thank You Ashish Dhiman

Asked by adhiman2 6 years ago  |  last reply 6 years ago

I have a 6v mini solenoid mounted on a wheelchair that needs to open twice daily for 20 seconds. Answered

I want to connect a Power source to a solenoid and a toggle switch. See photos below.

Asked by RaymondB56 2 years ago  |  last reply 2 years ago

I need an advice on making electromagnet/solenoid from bare copper coil/other option

Hi, I have in my lab room thick tinted copper wire. I planned using them to make some electromagnet, but fail to find a solution on how to insulated them. At first I thought using those acrylic/enamel can spray, but I am not sure if it would fully insulated them. Would the acrylic/enamel penetrate between the contact gap and insulated them or will it just fail to do so? In fact, I am not even sure if it's a good idea to begin with, because I don't want to actually waste the copper. As an alternate option I thought using those magnet wire from the Microwave Oven transformer, the one with really thick diameter. I would uncoil them, and manually turn them.  I thought I could use some of your advice. Actually, I dont mind if the process takes time, I am just looking a convenient way. Thanks  Richard

Asked by richardphat 2 years ago  |  last reply 2 years ago

Voltage boost

I'm trying to make a remote shutter release for my large format lenses. I found a solenoid that will do the trick. It's 12v / 36 ohm push solenoid with 3/8" travel. I prefer to drive this thing with a single AA battery. Is there a simple way to boost 1.5v?

Posted by JonLoder 5 years ago  |  last reply 5 years ago

Solenoid Valve Question:Power supply for a VERSA VSG-3521-U-D024?

I found a set of versas VSG 3521 and I cant seem to find the correct way to power them up in a circuit. From what I know they need 24V dc and 9.5 watts. I calculated that they need .395 amps is that right? Does anyone have any suggestions for a circuit that incorporates them, a power supply and a switch? Thanks for all your help!!!!!

Asked by amantux 7 years ago

At room temperature, how much pressure does a 12g CO2 cartage output? Answered

...and can it be controlled by a 10 bar rated 12v solenoid valve? I'm thinking about making a remote controlled Co2 confetti cannon and I'm planning on using a 12v 3/8" solenoid rated at 0-10 bar which will be operated by a relay controlled by a networked arduino. I realise that they run at different pressures depending on their temperature, but this will be used indoors. Thanks!

Asked by DanShort 6 years ago  |  last reply 2 years ago

mechanical wave

I'm trying to build a tail of a fake animal, and the tail is kinda long (total length of about 3 feet), I have a 10 pound pull solenoid and I want the tail to kind of do a wave thing, like if you were do a wave with your arms ( not in a group, all by yourself where you hold your hands together, you know what I'm talking about). I know how to do the electronic part of it by sending pulses to the solenoid, but How would I convert that into a believable tail?

Posted by guyfrom7up 11 years ago  |  last reply 11 years ago

Need an auto-off timer switch for my home-made electronic lock

Hello. I made my own (extremely basic) remote-controlled door lock a few weeks back. It consists of a couple of solenoids, a remote controlled pass-through plug socket and a shaver adapter (lol) The RF remote turns the plug socket on and the plugged-in shaver adapter carries current to the solenoids which causes them to retract so I can open the doors. I can also use the remote to turn-off the plug socket (thus releasing the solenoids, locking the door if the door is shut) But the problem is that sometimes I forget to turn the system off and the (still-retracted) solenoids get hot after 20-30 minutes, which is an obvious fire hazard. So I'm looking for a timer that will shut-off the system after a few minutes. I've seen plugs on eBay that are designed for hair straighteners and turn connected devices off after a set time, but they all operate at 30mins+ and most require you to push a button to set the countdown timer, which is just completely useless for me. I want a timer that starts as soon as it's powered-up and shuts down the solenoids after a couple of minutes if I forget to shut them down with the remote.  Any ideas where I could get such a thing? They're operating (via the shaver adapter) at 4.2VDC if that helps I've included a photo of the RC plug and shaver adapter in case I didn't explain it very well xx

Posted by daaabs 5 years ago  |  last reply 5 years ago