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?

Topic by stevelee10   |  last reply

What is a Solenoid Valve?

This Design Squad Nation animation shows how an electric current flowing in a coil produces a magnetic field. Explains how a solenoid uses a changing magnetic field to move a rod back and forth to do mechanical work, such as opening and closing a valve. For more Design Squad Nation visit our website.

Topic by designsquad 

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

Question by Digital Flame   |  last reply

Delay Power To a Solenoid Valve

I am making a pneumatic cannon with a solenoid valve which is turned on by a switch. However, I am wondering how I could delay the switch. So, when I flick the switch the cannon doesn't instantly fire, instead it would be delayed by maybe a half a second or so for effect. Would I use a 555 timer? I'm really new to this, so could you tell me how I would go about doing this? Thanks Guys

Topic by Make me a SANDWICH   |  last reply

Cheap air valves or solenoids?

I'm planning on building an unconventional pipe organ, but I am having trouble finding good cheap air valves that I can buy 60 of to complete an entire manual (keyboard). Normally, a classic organ would use mechanical linkages to a sort of air switchboard, but I have neither the time nor the inclination to build that kind of system (and I want everything to be physically robust and portable, for traveling and abuse during performances. Plus my pipes are very weird ones, and almost all of them would have to be offset anyway, so air tubes would be involved at some point no matter what.) So I'd prefer to have air lines going to each key, with a valve, and then the air lines continue to a much simpler switchboard, so that no pulleys or levers need to be involved. The valves can be electric (keys can easily connect a circuit instead of letting air through), or mechanical (pressing the key opens the valve), and my budget is about 2 dollars or less per valve. Any ideas or links? Homemade plans are welcome too, if you have a method that would be easy to mass produce and not cause leakage. Some of the lower notes may require higher airflow/larger valves too, so a solution that is scalable is preferred.

Topic by smurfsahoy 

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.  

Topic by woody1001625   |  last reply

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

Topic by IanS160   |  last reply

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.

Question by Chris414   |  last reply

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

Question by Newman180   |  last reply

Lego pneumatic electric valves?

Hey all. I was just wondering, I want to use the lego pneumatic parts like i would for the fischertechnik ones. And I was wondering if anyone know where i could buy an electric solenoid valve approapriate for the lego pneumatic tumes and pressures. 10-50 psi. or so. OR, if i cant find valves for the lego, where could i get a fischertechnik kit that had EVERYTHING needed including the electronics, motors, sensors, solenoids, tubes, wires, and everything else.

Question by sci4me   |  last reply

Analog Water Valve 1/2" or 3/4"

Hey guys, new here. Been looking around for parts for my project for a while now and so far have come up pretty empty handed. I am looking for some parts, or even some information on if anyone has a specific place for parts when it comes to household plumbing. i am trying to source out Variable water valves of the analog variety in 1/2" or 3/4" inlets (preferably in brass) to be controlled by an Arduino. They need to be able to handle a PSI range of 80-100psi and in a N/C state. $0-$30/each preferably Without fully giving away my project idea I basically am looking to switch out manual hot/cold water taps with electronically controlled ones. I need to be able to adjust how open the valves are so I can vary the temperature between the two pipes so that I can get an Arduino to control (with other sensors) and get a water temperature out the drain that is equivalent to bath water. (Hence why I need them to be variable and not just on/off) I have have checked local shops, asked plumbing friends, alibaba, and (of course) Google. And I just can't seem to be able to punch in the proper keywords to find exactly what I am looking for. The closest thing I can find is automatic sink tap solenoids but they require a manual set up and only output at that mix ratio, So I'm hoping that someone has a plumbing supplier to direct me to, I'm pretty much out of ideas. thanks in advance!

Topic by TheMartinDobson   |  last reply

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. 

Question by Brent Owen   |  last reply

Cheap Solenoid valve (or other electronically actuated valve) sources?

...i'm needing to find a good source for cheap electronically actuated valves (for liquid mainly)...i've found a few solenoid type valves through random google searches...but they're all pretty expensive....i can get just solenoids for under $2 from most places...but they're just the solenoids...and well...i'm not sure how to turn one of those into a valve assembly if anyones got some good sources for either solenoid valves or other electronically actuated valves (i've seen some people use ice maker valves for this...but those things are $20 and up...too rich for my blood)

Topic by crapflinger   |  last reply

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!!!

Question by Morgantao   |  last reply

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 

Question by amantux   |  last reply

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

Question by Fingermouse   |  last reply

Solenoid Valves with exclusive INSTRUCTABLES Discount - 15% OFF

We are offering an exclusive deal to the INSTRUCTABLES community of 15% off your purchase. This code is good for the rest of 2013! We also have free priority shipping for orders over $20. We love supplying users of the INSTRUCTABLES community with valves because they build some of the coolest projects! We have many sizes available and lots of low-cost options for those small projects. USE CODE: DIY2013

Topic by expressre   |  last reply

Question about sprinkler valves? Answered

I'm planning on making a potato cannon, however I want to make it be able shoot multiple times with one tank. If I make the firing valve a pneumatically powered sprinkler valve, will it have to empty the entire air tank before it can close? Or can I just release the trigger and have the valve close with still some air in the tank? I'm already going to have a 2 tank design with a firing tank and a primary air tank.

Question by General Eggs   |  last reply

Using a small solenoid to trigger a co2 hammer valve

Hello, I have a question that is integral to the design of a project i'm making. I am trying to make an airsoft gun. For a power source, I am using a 12 gram co2 powerlet. My main problem is the trigger mechanism. Since I want the design to be semiautomatic with no blowback, I decided on an electric trigger to avoid the long trigger pull associated with mechanical triggers. My valve is taken from an airsoft pistol magazine and is pretty small. It is operated by having the rear "button" of the valve hit with a simple hammer, which moves the valve pin and releases gas into the barrel. I want to use a small solenoid in place of the mechanical hammer. When activated, the solenoid's push end would snap forward and hit the valves "button." I was wondering if this is possible on any kind of smaller power supply? It doesn't seem like the valve button needs much more than a tap to dump a good amount of gas. All the projects i have seen like this are fairly large scale, for larger airguns, and they had to use large unreliable power supplies. I would like to keep this whole thing as lightweight as possible.  I was thinking that i could use a simple switch or circuit that would just dump some voltage into the solenoid for just a fraction of a second, to fire one shot for each trigger pull. Would this solenoid work? Also, the valve I am using is tiny, about an inch long. The "button" that needs to be tapped to release gas is about 6 mm in diameter.  Is there any way to calculate the exact amount of force needed to trigger the valve?  Does anyone have any advice for me? 

Topic by ilpug   |  last reply

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!!!!!

Question by amantux 

how to replace a GE WR57X10032 Dual Solenoid Water Valve with Guard?

I have a leak in the side of the valve. the valve is the one that the waterline connects into and 2 lines come out 1 goes to the icemaker and the other goes to the water dispencer. any help would be great!!

Question by cwb4life   |  last reply

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

Question by gerarddag   |  last reply

Convert airgun/Paintball gun to be fired by a computer (12v solenoid valve)

Hi!I have a project this summer where I need to convert a paintball marker and a co2 Airpistol to be fired by the use of a solenoid valve powered by 12v.The project goal is high-speed photography, more or less photographing object being hit by a projectile.What i need is a way to fire these guns precisely by the use of my computer and software, and since I already have plenty of 12 solenoid valves that work with this system I thought my easiest way is to adapt these valve to trigger the guns one way or another.I just purchased a Valken V-TAC SW-1 which I plan to use as base (for parts) My reason for getting this particular one was that it was on sale for 50% and seems to be fairly popular as it's based on the Tippmann 98 design.I attached an image of the valve I used with my controller and software (Cognisys Stop shot) now I can probably use any 12v solenoid valve (with the same spec ?) as the one I use now so it doesn't need to be these exact valves. As long as they can be operated by turning on-off power with the same powersource i use to control my current solenoid valves.From my understanding, most airguns use a pin valve, which is hit by a trigger mechanism that is then rearmed by the blowback.What would be the best way to modify an airgun for my needs? Replace the pin valve with a suitable solenoid i can control instead? Or go for a design that uses maybe use a piston and 2-way valve to hit that pin?The gun does not need to be mobile or ergonomic, it will be placed in a rig regardless, however keeping the barrel and keep the Picatinny is preferred to be able to mount marking aids etc. and mount the gun to a tripod.Any tips or suggestions are highly appreciated!Thank you!

Topic by PaulL320   |  last reply

Need regulator and compact solenoid 5/2 valve for small scale Co2 powered system.

Looking to drive a 5/16ths inch pneumatic cylinder all in a self contained package. Cylinder is rated for 150 psi and the 12 gram co2 i was planning to use is 900 psi so i need to reduce it considerably. I'm trying to make a moving costume piece, not a battlebots weapon or a bomb.

Question by Chirishman   |  last reply

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

Question by Digital Flame   |  last reply

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!

Question by DanShort   |  last reply

What do i need to control a sprinkler valve (24V solenoid) with an arduino?

I need to know what parts to get to open and close an electric sprinkler valve with my arduino. It's supposed to use 24V but I've heard that 9V works just as well. I tried using a 2n3904 as a switch with a 9V battery and it turns on but won't turn off unless I disconnect it. Since it's a solonoid (inductive load), I assume I'll need some sort of protection diode and noise-canceling capacitor. Would a MOSFET be best to control it with 5v output from an arduino? What models for these components would be best (and can be bought at radio shack)? Thank you!

Question by Vick Jr   |  last reply

Building Airpowered Bazooka

I am wondering if i use a sprinkler solenoid valve what kind of power i will need to operate it as in batteries

Question by joshmt2012   |  last reply

air cannon burst switch or light switch help

I am trying to build an air cannon with a circuit that opens the solenoid valve for certain amount of time (0.5 seconds) when I hold down the button, or detects, with a photo gate, when the projective leaves and shuts down the solenoid. So far I have a circuit that will shut down the solenoid when the projectile reaches the end of the barrel, but the solenoid turns back on when the projectile clears the optical sensor(optical switch). This is because I would still be holding down the button. Any tips to get the solenoid to stay turned off? It should probably stay off until I hit a reset switch.

Topic by dogsrcool2me   |  last reply

3d Printing aluminum? Answered

I was thinking about 3d printing aluminum and was wondering if you could do something like this. You have a stainless steel air tight cylinder, surrounded with some refreactory, then nichrome wire, then insulating refreactory. The first layer of refractory is to prevent an electric short between the wire and the stainless steel cylinder. Stainless steel so it will take longer to oxidize. You would fill the cylinder with aluminum, close it, turn on the heater, t would heat up the stainelss steel and aluminum and melt the aluminum. Temperature could be regulated. Air would go to a hole in the top of it, the air would be regulated by a solenoid valve and a a pressure release valve. A needle with come out of the bottom, however it would be bent into a upside down U shape and one side would poke out the bottom, this would preven the aluminum from running out when there wasn't pressure. When the solenoid is open, aluminum comes out, when the solenoid is closed the release valve is opened to get rid of any excess pressure and stop the aluminum flow. This would be put in the place of the the traditional extruder, would this work?

Question by snowluck2345   |  last reply

How to turn on a 24v solenoid when a 110v unit is shut off? Answered

Ok, so an odd ball scenario. I need to open a 24v solenoid(lawn sprinkler valve NC) for 5 minutes after main power(110v) has been shut off to a device. I have the ability to piggy back on all the power terminals, so it could have constant and switched power. I feel like this kind of thing will exist somewhere, I just can't find it at a Home Depot, and can't seem to google the right key words. Thanks to anyone who can point me in the right direction!

Question by Hack/Slash   |  last reply

How make round 5" air duct valves?

We moved into a large (for us) house, and we only use a few rooms. I managed to repair the furnace, but the first bill was astronomical. Beyond the leaking windows and lack of insulation, the problem is that, as it is, we have to heat the whole house. I've discovered a temporary method of blocking vent tubes to unused rooms (by stuffing the tube with a rag), but I want real valves. I've heard they are called air duct dampers.  My vents are on the ceiling aimed down.   So, I've seen these check-valve 5" ones but I haven't found any that would open and close manually.  But this doesn't seem like it would be difficult to make. I'm toying with the idea of using a cone-shaped "lid" with some kind of springy cord holding it in. Does anybody have any ideas?  How do I make a manual (or electrical solenoid, I suppose) operated valve for a 5-inch round air duct?

Topic by nehmo   |  last reply

What parts are needed to build a sensitive, push-plate activated, solenoid valve to act as a cat water fountain?

Hello Instructables Community! I am on a mission to water my cats! I have two cats that prefer to drink straight from a running water tap than from their bowl. I don't know if it is a freshness thing, or if it is just their odd nature, but they will always go for running water over a clean bowl of water any day! Also, they tend to drag their bowl of water around and it gets everywhere and is ruining my hardwood floors. So, I would like to accomplish the following: Build a push-plate activated water fountain that has flow controlled by a solenoid valve. I hope to train the cats to push on the plate in order to activate the water so that they can drink. I am hoping that the community may point me in the right direction to find the parts I may need for this project. I am hoping that the plate will be something small and relatively flat so that it does not stick up from the side of the bathroom sink too much. Many thanks!?

Question by audiological   |  last reply

Electronic Circuit

I have a spst relay(operating voltage-12v) using for switching the solenoid valve(24VDC and 0.5Amp) which connected through 24 V battery. relay is again connected to the transistor BJT NPN . So please suggest me that which transistor is most suitable.

Topic by jay_3189   |  last reply

Powering a 24 Volt sensor with an arduino? Answered

Hello!   Ok here is the issue. Right now I am designing a rain water collection system by having my down spout drain into a 55 gallon plastic drum. I want to cap the drum to avoid spillage. The problem is what happens when the drum is full and the rain is still coming in. I know there are plenty of mechanical ways to solve this problem but I wanna have fun with an Arduino I have laying around. What I am thinking is run a pipe out of the bottom that has an irrigation valve installed (for anyone who is reading that that isn't aware of what an irrigation valve is, it is and inexpensive solenoid valve that is used for unground sprinkler systems). I figure I will add a water level sensor to the inside of the barrel and then hook the sensor and valve together via my Arduino. From there type a little code and violaa I have an over fill protection device! Here is the problem: An irrigation valve is 24v and the Arduino is 6volts. I know I can get the 24 volts from a power supply down to 6volts via resister, but then how would power the valve? My goal is to NOT have to buy a 12volt 1" solenoid (i didn't want to spend a lot of money on this project). I am not sure if there is a solution to this problem, but being a very green/inexperienced electronics hobbyist figured could hurt to ask. Thanks

Question by Mpc1055   |  last reply

i am making an arduino automated mushroom climate control , i want to control the humidity of two rooms using relays?

Using arduino uno , pressure pump ,two solenoid valves  i want to control the humidity of two rooms . my planning that when the humidity of room no 1 falls below 80 the relay for pressure pump and the relay for that specific solenoid have to turn on and turned off if the humidity is above 90. The same procedure for the next room . As i am using single pressure pump for both rooms ...i am finding difficulties for reading two DHT11 and controlling three relay .....  

Question by abhisuma   |  last reply

i want to make a razer robot.....

I find some things like 12v solenoid valve , 12v hydraulic hump & motor ,but still can someone tell me ,how much SPI is required for mine hydraulic pump and what should be rpm for motor , mine robot's double acting cylinder's bore is 40mm and stroke is 150mm(15cm).. pls replay soon...........

Question by vish3385   |  last reply

Need a table top that can push stuff upp in the air

Okay so i need some help with a prop for a photographing stuff in mid air.I need a device (flat surface) that I can place objects on and it will shoot them up in the air.Imagine a bowl of popcorn or a pair of glasses with water in them flying up in the air etc. I will then have sensors that will trigger the camera at the right time. (these devices and system I already have)My dream would be to be able to control this "jump table" device thru a simple solenoid valve. (12v) So my rough plan is to have to sheets of wood 40cmx50cm about 1cm thick.Next is to have a pneumatic cylinder in between these two that will push the top plate up and down.I probably need some sort of guides in the corners of the plates so it moves correctly.The pneumatic cylinder will be controlled by a solenoid valve, the solenoid valve i hope to turn on/off with a 12v power supply. The easiest solution for air source would be a co2 cartridge.But if that's to much pressure for the components maybe a cheaper air compressor in a smaller size is usable ?So what im looking for in general advice in terms of pressure and pneumatic cylinders, which i do not have any experience with.This video pretty much has the basic components i need i guess ?Any general advice what to look out for when choosing components and air source ?Thank you!

Topic by PaulL320   |  last reply

Recoil simulation! Gas single action air cylinder or extended solenoid? Answered

OK, final question for this project! You guys on the other answer topics gave been a great help even if I haven't had time to reply yet! One half sorted onto the other. I have a tube with a 25mm diameter about 20cm long ( I could put a smaller pipe inside this and extend it at least another 20cm) I need recoil. Not super realistic, but as heavy as possible. Budget is about 40 pounds. (Money) My current ideas include either a 350g metal 20mm diameter by 10cm bar and a spring, being moved by a 250g solenoid with 10mm stroke, I would replace the metal solenoid bar (thing inside soldnoid) with a longer one, this will encrease stroke. Even if this did work there would be little recoil, though it is cheap and very easy. Power is a very short 12v pulse. The alternative idea is the pneumatic one, I don't really want to do this asi need to conserve my air supply for the other part of this project. It's effectively a solenoid valve (12v pulse) and an air cylinder (homemade to conserve price) which is attached to that weight aforementioned. Power is 6bar. This should provide significant recoil but is expensive, difficult and wastes large amounts of gas. is there a better way? Is there an electronic way that could avoid gas but still have heavy recoil and use my 12v pulse? Even if it is out of my budget, it'd be great to know. This is to simulate a backwards recoil as heavy as possible. Final question (unless something goes wrong) I promise!  Thanks.

Question by Digital Flame   |  last reply

Arduino soda fountain?

I would like to make a arduino soda fountain but i need some advice. Heres my plan Take an 8 channel relay board hook it up to the arduino. Then I take a 8 key keypad and hook to the arduino. I would buy 8 solenoid valves and hook them to relays. The valves would hold 1 water line and 6 flavors. Then i get stumped how do i get the last line to be carbonated water because if you had to take a soda stream to make the water it would take away from the effect of the machine. If any body knows how to do that i would love to hear I will also take any other advice Thanks Kaden

Question by FarmerKJS   |  last reply

different liquid detection sensor

I am building a biodiesel production system. at different points in the process, a tank will have different liquids in it (sometimes more than 1 type, separated out). for instance, there is a point where glycerol sinks to the bottom, while biodiesel floats on top. what i want to do is drain the glycerol from the bottom of the tank (via electronically controlled solenoid valve), then when a sensor detects a change in material (biodiesel), shuts off that valve and opens another (final product tank). for the life of me, i cannot find a sensor that will do this for less than $100. preferably, i'd like to spend less than $30. i can work with a resistive type or voltage type sensor. i just need to be able to make that distinction of material change... any ideas? THANKS!!!

Topic by samurai1200   |  last reply

I'm making an air cannon and I'm trying to make it automatic. How do I make the timing circuit?

I don't have all the details worked out but it should look like: just need to know how to make a timing circuit so that the bolt reloads (the servo should retract then detract), and then the solenoid valve is switched on for a split second (so as not to waste the air) and then reloaded again. I need it do this as long as the trigger is held down. I have no idea how to make this circuit, and I'm totally new to this so please explain in detail. pictures would help a lot.?

Question by strid3r   |  last reply

My Maytag mod. is LAT9614AAE. The problem is cold water runs constantly whether mach. is turned off or not. Advise.. Answered

My Maytag washer runs cold water constantly, will not turn off. We were doing some laundry and fortunately my wife was doing some other chores in the basement or our finished basement would have been flooded. I have not attempted anything as yet, but I do want to make the repairs myself if possible.  I suspect a stuck solenoid or valve on the cold water side.  Please advise the proper way to get into this area without damaging the machine. I am handy with tools and repairs around the home. 

Question by Debra kay   |  last reply

Mains Beer?

My head occasionally says "what about mains-beer?". Instead of buying stuff to take home, you have a beer-tap on the sink. Here is how it might work: You build a distribution centre, which may just be storage, but could also be a brewery, and run pipes around a nearby residential area. Each home has a beer-meter like a water-meter which is data-linked to a consumer-unit on a beer-tap on a sink. The distribution-point provides mains-beer under gravity, consumption of which is measured by the meter and data is fed to the consumer-unit. That box displays beer consumption, and via a radio-link informs the distribution-point. Periodically the lines will need to be flushed, here's how that would work: > The centre switches the supply from beer to water, which is coloured with a harmless-dye, and radios the consumer-units which display the message "free beer" whilst playing Happy Hour. Consumers vigorously empty the lines while it's free. When the water hits the meter-unit an optical-sensor calls the consumer-unit to shut off via a solenoid-valve, the consumer-unit reports back to the distribution-centre that water has reached it. After a set period the distribution-centre radios the units which haven't yet reported water to open (solenoid). Any units failing to give an adequate response within a reasonable period are radioed to display a "fault" message and flagged for a service-visit. The distribution-centre then switches supply to cleaning-fluid, and messages all consumer-units to display "cleaning!" and open up (solenoid). Once sufficient flow has gone through each meter, they shut off (solenoid) and radio-back. Then a water-flush follows in a similar way. Once the lines have been cleaned, the supply is switched back beer, the consumer units run until they no longer read "water", plus a bit more to clear dead-volume between meter and tap. Then the consumer-units display "read to dispense fresh beer". Pros: Beer is chilled by the ground in which piping is laid No packaging-costs (cans / bottles / kegs) Less transport costs Drinkers have an almost unlimited supply enabling them to drink more than they might otherwise. No more beer runs when the game runs long or uninvited guests show up (Re-design) Consumer units can display total quantities dispensed, with cost and "don't you think you've had enough?" Cons: Initial infrastructure cost It'll work best with poor quality-beer Well?

Topic by lemonie   |  last reply

Problem with compressed air, ping pong turret

Hello all, I am in the process of making a ping pong ball turret powered by an air compressor, I’m using a solenoid valve to trigger the air electronically.i have had some exact diameter steel pipe milled out which is 250mm, so the diameter of the balls are 40mm and the diameter of the pipe is roughly 40.5-41mm. And I’ve sealed off one end with a tapped out hole for a nozzle fitting. My compressor goes up to 7 bar -around 100,psi -. Do finally to the topic 0f my question, i have tested the firing of the balls by firing 7 bar through an compressor gun, and to my surprise it didn’t fire across the garage like I expected, instead it made a very high pitched noise and the ball vibrated inside the tube, eventually the ball would rise up the tube and eventually speed up towards the end of the tube but still only launched at most 1 meter. Any help on how to fix this problem would be excellent. As I expect 100psi through an exact diameter tube would fire the ping pong ball very far. Feel free to ask any questions if I haven’t been detailed enough. Cheers

Question by bashmore00 

How can i compress a biogas from a compost tank without risk of ignition.

I already have minor semblance of a design but, i always prefer to consult the hivemind before doing something potentially stupid(i'm missing enough fingers). so, big picture is to create basically a sealed septic tank tied into the water lines of a residential house, which would produce methane to be stored year round then used during the cold season. not so much that i could cut off the natural gas line, but enough to reduce the bill.the design so far is a gas line coming from the septic tank connected to a bladder sitting inside a large tube. once the bladder reaches a nominal capacity, it will trip a sensor near the top of the tube activating a compressor until the bladder retracts to a lower set optical sensor turning off the compressor. somewhere in this mix i have the intent to set up a large air filter filled with that "oxygen eater" stuff they use in food storage applications. as well as several o2 sensors in the main line set up to stop the compressor and activate a solenoid valve to make sure no oxygen ever get to the compressor. what i dont know, is what kind of compressor i should be using to avoid any type of possible spark. proper placement of the o2 sensors, and if a giant air filter for eating oxygen already exists or is that something im going to have to make the hard way.

Question by snowfox222   |  last reply

Propane flame thrower

    Please read full post before making any comments. First of all yes, I know real flame throwers use napalm and compressed air to operate, but I don't want any crazy range and lethal power. I don't intend on using this thing in combat. I'm thinking something with a 4-5 foot flame, more if possible, (I don't think it would be with propane, but please, correct me if I'm wrong). I don't want a jet flame so I'm assuming I'll need to lower the pressure to get a more "violent" looking flame with the desired ranged. A "gas pump handle" for the flame control (sorry I don't know the proper term for that type of mechanism. it's not really a trigger. A lever valve?), or I might use a solenoid, not sure yet, Whatever would be more effective. Again, please give me any input your may have. The fuel source would be a large propane tank that I will have strapped to my back, I already have a design for that. If that seems too extreme I might do what this guy did and use a small tank with a reservoir, but with two tanks for more fuel. ( )  I'm undecided on whether I want electric ignition if anyone could give advice on that as well it would be appreciated. Anyone who has made something like this or knows what they are talking about please give me your input. Yes, I know this is a dangerous project and I take full responsibility should anything go wrong.    This is a video showing the flamethrower that in the above video being used. It displays the kind of performance I am looking for, except I don't want it strapped to my wrists.

Topic by shark4t   |  last reply

How to power IoT devices with a 12v DC source (Like a Solar Power Kit without the Inverter)?

Hello,Iam a novice in electronics but have a passion for tinkering with IoT (Internet of Things) devices and other electronics projects, I have a system setup in my farm that uses the following devices,Raspberry pi 2 (5 Volts 2 amps)Wifi Modem (12 Volts 1.5 amps)3.5inch 250GB Hard disk for data logging (12 Volts 1.5 amps)I plan to use the system to monitor and control the water flow to some of the crops in our farm using soil moisture sensors, solenoid valves and flow sensors.The issue is that the system needs to run 24/7 and is located in a remote rural area where power cuts are frequent. I need to run these devices on a solar power solution so that they can stay off-grid (for power).My question is whether it is possible to power the devices off the DC power that is generated from a Solar power system (Solar panels, some batteries and a charge controller) without the need for an inverter.My reasoning is that the inverter converts the 12v power from a solar panel and batteries into 240v AC power and the DC wall-warts (DC power plugs for devices) convert the 240v AC power back into 12v or 5v for the respective devices. This conversion causes inefficiencies in the solar power system thus losing energy that can be better utilised.Note: We use 240v AC standard in India (in the US they use 120v AC standard), I plan to use a DC-DC Step down regulator to power the raspberry pi 2 off the 12v power provided by the solar power system and other similar regulators boards to power the wifi modem and the hard disk.

Question by arunprasathmba11   |  last reply