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So all right, let’s start with these guys. These guys are piezo. Buzzer is what a piezo buzzer is that it has a thin electrical plate inside it, which is made of a piezoelectric material that basically vibrate mechanically whenever a voltage is applied to it. The same principle as a quartz crystal that’s used in watches, which also vibrates whenever energy is applied to it, or vice versa, so keep in mind that these are called buzzers and sometimes they’re called speakers. But I think speaker is misleading. They should be called just buzzers because they can only play tones melodies and the contrary, play music or sound effects or human voice, and actually I don’t think this one can either I’m not a sound engineer or something. But I think this one, you can only play some tones that’s about it so anyway, let’s get these connected to our Arduino. The visual differences between the active and the passive speakers is that the active is little taller than the passive one, and also the active is. Let me turn out just a zoom here: okay, better and the active is sealed at the bottom, but the passive is not sealed at the bottom, so those are the differences in the visual appearance. As far as functionality is concerned, the active speaker has active components built in into it and that’s the reason it’s called you know, an active buzzer. The passive is just a piezoelectric material, so it needs active components externally, on your breadboard or you know, inside your Arduino.

The way you generate the wave to work let’s keep this on the side for now let’s try to connect our active buzzer to the Arduino let’s let’s make actually let’s. Remove this resistor and let’s make the simplest connection that we could make. So, as you can see, one lead is longer than the other and just like general electronic component. This is the longer is a positive lead and the shore is the negative lead and there is also a plus indicator on both the buzzers, so that actually makes things a lot easier. So I’ve got a very simple circuit setup here: we’ve connected only the 5 volt and the ground pin to our Arduino and the 5 volt is connected to the positive side of the speaker and then the negative is connected to the ground through a 200 ohm register Or 100 ohm resistor, you can use any small value of resistor it doesn’t matter so let’s, actually and as soon as we power the Arduino, we should hear a sound yeah that’s pretty annoying what’s happening here. Is that, since this is an active buzzer, whenever 5 volts is applied to it, it just starts buzzing automatically because it has active components built in and then, if you connect the passive buzzer instead making sure you connect the positive to the positive and the negative for The negative, you will not hear anything so yeah, nothing so what’s happening here is that the active buzzer when it’s, given a straight line voltage of 5 volts or 3 volts or whatever it can convert that into sound because of the active components, whereas this guy it’s Trying to run away can’t do that.

So how do we operate a passive speaker? What this guy needs is a varying voltage, basically so more like an AC signal or a PWM, which is pulse width modulation. So we need a voltage that goes high, low, high low high low. What people usually do is use a square wave to generate a PWM signal which power is one of these speakers. Now. The good thing about the PWM style, sound generation is that you can either use a passive or an active speaker and it’s gon na work. So let’s write a simple code and start generating. Some sounds ok, so this is actually all the sketch you need. If you want to generate a sound, all you need is the tone function, and this function takes three arguments. It actually takes two arguments. This one is optional, so the first argument is the pin that you’re using in our case, we are going to be using. Pin 11 here. Pin 11 goes to our speaker. You can use either the passive or the active speaker. It doesn’t matter. Let’S use a passive one to show you that it actually works, and then this goes to the rip through the resistor and to the ground. This is actually connected to five volts, so let’s sing that up and connected to ground okay looks like we’re done now. The total function we’re connected to pin it 11 and then. The second argument is the frequency in Hertz. What you would like to generate so let’s say we need two thousand Hertz and then this is the time period, which is optional, so I’m taking 500 milliseconds.

As the time period here and that’s about it, so let’s go ahead or Arduino is plugged in powered up let’s, go ahead and compile the sketch, and the tone should start playing in a couple of seconds: okay, that’s, pretty annoying so that’s. Actually, all you need to know if you want to generate a tone and where could this be useful? This could be useful in a situation where you want to make a project that has the buzzers or alarms, for example, if you’re measuring water level or temperature. If the temperature goes too high or the water level goes too low, you want a buzzer to sound, for you know, half a second or keep beeping for a millisecond that’s, where this could be pretty useful, and this is all the piece of code you need. I mean, obviously you can make it better so now that we know how to do a simple code. Let’S actually go ahead and do something more complicated like this. So what this one does is, it plays the mario bros tune and it uses a piece of buzzer and PWM. The previous tone that we played also used PWM and PWM, is the only way. As we said you can make the passive resistor the passive buzzer work. So what it needs us to do is connect the buzzer to pin three or anything that we specified in the code, but since they are specifying pin three let’s go ahead: change it up and connect to pin zero one.

Two: three: okay and let’s: go ahead upload! This code and see what our buzzer does so, while it’s compiling, if you’re wondering where this can be useful. Obviously, if you’re building an arcade game or something like that, you can use a simple buzzer, because it’s just gon na generate a couple of tones high pitch low page, nothing, nothing complex! Okay, I hadn’t connected the ground. Pin so let’s go ahead and do that and it should stop playing pretty good. Okay, let’s switch it up for an active buzzer, and this should actually sound better because of all the active component yeah. This is this is more like it more like the game and, lastly, let’s try what a toy speaker can do. Actually, I think this one is doing a much better job yeah. I think this one is the best so far, so yeah that’s pretty much how you can use either a passive, active or a speaker to generate tones alarms ring tones anything you like, I know what you’re wondering what, if what, if you want to play, something more Complicated like like music or maybe play back a recorded voice. In that case, you would need some extra components to do that, and probably a nicer, a speaker so I’ll probably be making a video about that.

 
 

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