arduino 5v relay not working


I said that today the physical dimension, as you can see it here, we have three connections here that can be connected to Arduino for control and power purpose. We have three terminals here, this one, the middle one is positive. The other side is negative. If you can see it here, they label it as negative and then the last one is signal ground. The middle one is positive, which would be connected to five volts. This will be connected to the power of Arduino, and this is a signal where it receives a signal to turn this on. Now we have an LED here whenever it receives a signal to energize relay to establish that connection. This will turn on indicating that there is signal on this side. We have three terminals here, and this is normally connected. What it means is that if you connect two wires like that, this will be, these two will be connected if you connect two wires here. These are normally open and they will be connected or be connected like that when the power establishes or the signal comes whatever you do, this pen, the middle one, will never change so keep the wire the middle wire here. If you don’t know what is the condition of the relay under what condition it’s on off so keep the middle? Not changed, just change the other wire here or there, and then you will find your way. Another thing that’s to remember about this relay is that it can handle up to tell ampere and any voltage.

It assists 30 volts 10 amperes if you are using 30 words or 28 volts that’s 10 ampere. But if you are let’s say in North America you are using 20 volts, so that’s tenable. So what you do is multiply by 10. Just put a zero here this this can handle in North America, 100 1250. What 1.25 kilowatt machine the turn on and off. Even if you’re in Europe or Asia or somewhere else, which has 220 or 240 volts, so then it would be two thousand five hundred watts, so remember that that’s the limitation, because if you connect a load that is heavier or it needs more current, this will melt Down or not, were considered a limitation when you’re using it. Another thing to remember about this: one is that this is not optically isolated, so it doesn’t have optocoupler, which means the relay is connected to the rest of the circuit. Except these three contacts are isolated. Totally. Keep in mind that when you’re working with AC voltage, we have to be very careful. You have to wear a protective gloves if you’re trying to touch this area once it’s connected or the power is connected and make sure that you do not put this in a metal metallic surface. Let me explain the AC bulb, so this is a table light. That is connected to the wall outlet and then the wire goes and will be turned on, but I have disconnected one of these two wires here.

I’Ve just cut this wire from here now this can be connected to the relay. The relay job is to just connect. It so it will be on and disconnected it will be off, I’ve just twisted them and then put some solder. So this can be inserted into a connector with a screw to connect the wire just unscrew this here and then insert the wire and then tighten it back the same thing for the other one. Now I have connected the AC load here between the metal, one and the side. This is normally open. So when really get power or gets a signal that will connect these two wires to turn on the bulb when it’s connected to pin 7 and then the red is connected to 5 volts and then ground is connected to the ground of Arduino. Let me explain the code, the setup we have just said this pen mode setting pen 7 as output, but this will be connected to terminal s or the signal of Arduino and setup. We don’t do anything and inside the loop we say that when, as initially it starts, pen 7 should be high, this is connect turning the really on and then keeping it for 3000 milliseconds or 3. Second and after that, it turns it off and keeps it off for five thousand milliseconds, so this is as simple as that you can do whatever you want under your condition or controlled, controlling some heater or maybe the relation be turned on and off, under certain condition.

Let’S say a temperature increases or you’re turning on and off some fan or other equipment, you can do it here, just control up and seven to be high or low under certain condition. Example, this push is a value of a push button that you’re receiving it. When somebody pushes a button or the values, how, if you say if push is equal high, then turn this on and keep it for 3000 milliseconds on or you can just remove this and just say turn it on just put this line now, the AC load is Also connected everything is connected except Arduino, or do you have any you? Don’T have any power, yet there is AC now there, as you can see, normally open means when the system doesn’t have any signal or any power it’s open or connected, but it grew for three seconds on and 5 seconds off, you can get the code by clicking At the link at the description below or you can go directly to Rubicon, slash learn flash Arduino. Thank you for watching.


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Originally posted 2016-10-01 06:11:10.

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Comment (47)

  1. Hey, The circuit is DC,and if we give the AC Supply. how could the bulb works as the bulb is also being DC Bulb..

    1. We have power to Arduino and then the load. You have to understand and separate them. Your load can be AC or DC.

  2. I want to run pneumatic solenoid (24 Volt DC) using Arduino….do I need a 24 volt battery for it or just a 9Volt small battery connection to the Arduino is enough?

    1. Arduino needs it is own power so 9V will work for it. For your solenoid, you need separate power. In this case instead of bulb use your solenoid and instead of AC use your 24V.

  3. Hello Sir, thank you for your tutorial. However I am new to arduino and I have one question to ask. How to prevent the delay affecting my sensor system. Because the delay of relay effect the measurement reading of my sensor? I am looking forward for your answer. Thank you very much sir.

    1. @Robojax I don’t understand why the trigger pin of the relay is connected to pin 8 which is high when the writedigital value is HIGH??? At this instance, will not 5v will come from pin 8 and damaged the relay??

    1. @Robojax thanks friend, I plan to do some projects with this relay soon when my order comes in from eBay

    1. I watched the video wondering how come I did not address such important thing. Surely enough, I have explained it in the video. Please watch and do not escape. It has been answered.

    2. @Robojax I meant say that since it can handle 10A at 240VAC then should be able to handle a bit higher than that at 125V. Shouldn’t that be the case?

    3. And will I be able to run a 0.25HP motor with the help of such a relay? The motor barely draws 150W at 220VAC.

    4. “since it can handle 10A at 240VAC then should be able to handle” yes it will handle lower but not higher.

    1. You have not watched the whole video. It would have been clear if you watched. At 3:30 you will learn how two wires come into existence.

  4. I can’t find many people who use single relays and arduinos with AC devices, so thanks for the video! To clarify though, you said that you have to know the “load” on your device (that you plug into the relay) so it doesn’t melt the relay? What if my device doesn’t say? Thanks again

    1. You are welcome. Sorry I have replied the next day and it has not been published. You should be able to find the rating. The Air conditioner, Large Pumps, Washing machine with dryer are those which are beyond the rating of this relay. Some toaster are large and above the limit. But do research online, use google image, take photo of your device and upload it and you will find the item with details.

    1. No problem. You are welcome. I have a lot of other videos on relay. You may search for them and I have explained them in different contexts.


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