arduino output current
I wanted to do it pretty much a giveaway. So if you want to stay tuned watch the video till the end, I have a nice surprise for you. So, thank you again for watching subscribing commenting on my videos and hopefully you enjoy the tutorial and yeah, see you at the end how’s. It going guys a lot here and welcome to the 11th Arduino tutorial in which we’re going to be discussing. How do you actually control how high voltage outputs through your Arduino, so some of the challenges? As you know, what they’re at we know is first of all the fact that it works with the 5 volt and 3.3 volt environments, and it is also uncapable of driving a high currents. I believe I mentioned them a couple of my tutorials. If you look at the datasheet of the atmega328, which is the main ship of the arduino, the maximum currents you can generally source are within 40 milliamps. So driving something like a high power LED strip will require a outside device of the arduino, one of which is a very simple transistor or you may also use a relay. So let’s start with the transistor a fairly simple circuit and then we’re going to jump to the relay alright. So, as I mentioned I’m looking to drive this high power LED strip and looking through the specs I’m quickly, realizing that the operating voltage is 12 volts, which means that I cannot simply connect the Arduino pin directly to the LED strip and toggle it on and off.
Like I did with the previous digital LEDs, which, which means pretty much that I have to use one of the two methods that I mentioned earlier in order to drive the strip so let’s take a look at the first method. So, if you’re interested in the in depth, transistor theory, let me know in the comments below otherwise I’m just going to quickly go through this so I’m, using the two and four four zero one general purpose: NPN transistor, so quickly going through the datasheet, the emitter volt, The collector emitter voltage is forty collector base is sixty. We also can drive a current up to six hundred milliamps. So, as you can see, those specs are way within the range of the power LED strip, which only requires 35 milli amps of current as calculated from the power consumption as well as the voltage. If you want I’m going to post the link to this datasheet, if you’re interested in some of the other characteristics of this device, so let’s take a look at the circuit that we need to set up in order to drive something with a transistor by using the Arduino so here’s the circuit that you saw earlier as you can see, I have a 12 volt DC barrel, jack on here that you may have may or may not have noticed. So that goes to my breadboard. I have a and I’m an inground. Obviously, I also connect my Arduino to the common ground to make sure my both of my circuits are on the on the same ground I’m, using a pin 13 to drive the transistor through the base.
I have a current limiting resistor of 22 kilo ohms in my case, depending on the transistor that you may be using. It could be different. The ammeter side of the transistor is also grounded. I am then driving the collector side through the strip so I’m pulling one wire through the LED strip and pulling the positive or the high voltage side of the LED strip to the 12 volt rail in order to power the LED strip. So what happens exactly is when I apply the voltage to the transistor. I have a closed circuit, which goes through the ground to my emitter to the collector through the LED strip, and then it goes to the 12 volt barrel jack, thus closing that particular loop and lighting up my LED strip so let’s take a look at how this Works on an actual circuit, so here’s the circuit in action, just a quick correction: I’m using a pin 9 of the Arduino instead of the pin 13 mentioned earlier because I’m, I decided to load the PWM example or sketch onto this on the Arduino in order to Fade in and fade out the LED strip, so that requires a PWM output, as you have learned, pre in the previous tutorials, so again, let’s quickly overview. The circuit pin 9 goes through the resistor to the base of our transistor, which turns the strip on and off. As you can see, if I remove that pin nothing is happening, so I need that pedal.
We have output, the strips power and ground are going through the collector and the emitter of the transistor, and I have, as I mentioned earlier, the barrel Jack of 12 volts from a power supply coming in to the circuit as well. So, as you can see, I can very simply drive a high voltage element by using the transistor, so you can apply this for motors that require a higher current higher voltage devices. Obviously, there’s going to be restrictions for the transistors, but you can also drive solenoids all kinds of pumps, etcetera, so let’s take a look at the power relay module. Next, so really module is going to give you the ability to drive much higher load. So, as you can see, the ratings on the undies is 10 amps. So you can pretty much you can drive very powerful heaters. You can drive very heavy loads. You can drive motors. You can drive pretty much whatever you want like much bigger things. Then a transistor would allow you to so. The really on its own has to be driven through a transistor as well, but since I have a module it eliminates that problem, so I all I have to do is pretty much put a ground and 5 volts onto the rail. So, as you can see, the reel itself has four pins: the relay module. Sorry, so the ground both of the V ends and then the VCC. So V n is the actual signal which is going to be toggling right now I have the basic blink sketch for pin 13.
So, as you can see, I have the pin, toggling and pin 13 and the opposite is happening on the relay. So the output of the relay itself is basically the functionality of the relays when you energize the coil inside the relay you’re, either going to be pulling an eye contact or pulling pushing out a contact. So in this case from the markings, let me just zoom in a little bit into the module. So, as you can see, there’s markings on the module itself in the normal situation. The relay is closed to this pin and once you apply a voltage, meaning that that LED is lit up, you will be toggling that connection to the white wire that I currently have connected. So if you follow the previous explanation, if I plug in this wire, I should be able to simply complete the circuit and power on the LED strip. So let me just put it in there and tighten the connection because it’s going to be inconsistent, so this is essentially like putting a very basic button in the circuit. So all I’m doing is closing that contact allowing the current to flow through from the barrel jack through the LED strip and then back into the ground of the of the 12 volt connection, and that allows the strip to light up. So this this 12 volt portion of the circuit is completely isolated, there’s, absolutely no there’s, no common ground, there’s, no there’s, essentially nothing.
The only wires that are even touching the this portion of the circuit are these two and that all they’re doing is going through the contacts of the really. So that is how pretty much how you can drive powerful loads. I have received a lot of questions asking how you can drive multiple LEDs through a single pin. So obviously they are do. We know, like I said, multiple times – cannot drive more than 40 milliamps and even lower in different cases based on the datasheet, so pay attention to that, because the Arduino itself is not protected against overloads so make sure to use transistors andor relays one necessary. So once again, thank you guys for watching share this video. If you can leave me a comment, if you have any questions, let me know what projects you’re using the relays or ant transistors on and thank you once you get for watching bye, so I’m going to be giving away the msp430 launchpad kit. This kit was first released by Texas Instruments about two years ago. I believe, and I got my hands on two of them so I’m – going to be giving away the spare kit so in order to participate in this draw, you need to be a subscriber of the channel, so please click the subscribe button down below. You also need to share the video so that your friends and family can also join the draw, and you need to leave a comment down below you can comment whatever you want.
I don’t really I’m, not picky. All. I knew this. The number of the comment which you left I’m also going to be checking if you’ve left multiple comments. So please don’t spam. The comment section and give a chance for others to participate as well and at the end of this draw, which is going to be in two weeks I will be pulling. I will be using essentially a random number generator to pull a comment and the skill is going to be sent out to wherever you live anywhere across the world as long as it makes through the customs, and there are no issues in your country. I don’t know if you have to pay customs anything like that that’s going to be up to you.
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Originally posted 2016-08-20 09:58:40.