14 replies to this topic

[Chris Walker]

I'm happy to announce the new Piezo Buzzer module for Netduino Go.

Piezo Buzzer (go!bus module) (Amazon)

For international community members, they should also be available at Proto-Advantage and UAM within a few days.

To use the new Piezo Buzzer module, add the attached DLL to your project as a reference. Create an instance of the NetduinoGo.PiezoBuzzer class, and then set the frequency.

Here's an example which syncs the piezo buzzer's frequency with a potentiometer's position.

NetduinoGo.Potentiometer pot = new NetduinoGo.Potentiometer();
NetduinoGo.PiezoBuzzer buzzer = new NetduinoGo.PiezoBuzzer();

while (true)
{
    buzzer.SetFrequency(pot.GetValue() * 2000);
}

The Piezo Buzzer driver is included in the Netduino 4.2.0.1 SDK (on the Downloads page).

Chris

[Stefan]

For those who want to play some tunes and are familiar with the old BASIC PLAY syntax, I made a small wrapper for the Netduino Go! Piezo Buzzer Module so it can use the Speaker-class I published earlier.

You'll find the sample code attached. It'll be updated later in the .NETMF Toolbox, but for now it's all in this zip file.

Also, Christoc made a very nice sample, available at http://forums.netdui...odule-tutorial/

Attached Files

•  Netduino Go! Piezo + .NETMF Toolbox.zip   277.89KB   36 downloads

[Chris Walker]

For those who want to play some tunes and are familiar with the old BASIC PLAY syntax, I made a small wrapper for the Netduino Go! Piezo Buzzer Module so it can use the Speaker-class I published earlier.

Whoa. That's a pretty epic sample for a piezo buzzer!

Now who can guess the tune?

Great work, Stefan. [Also, thanks for your tutorial christoc!]

Chris

[Dan T]

Mine's on it's way. Added another Pot Module and a new tip for my soldering iron to bump me into Super-Saver Shipping (free). This would be easier with a Secret Labs Module-of-the-Month-Club.

[TinkeringTurtle]

Any technical specifications for the actual buzzer hardware available?

[Chris Walker]

Any technical specifications for the actual buzzer hardware available?

The piezo buzzer is muRata PN PKM13EPYH4000-A0.
http://www.digikey.c...KM13EPYH4000-A0

4KHz, 70dB @ 3V, 10cm

Chris

[TinkeringTurtle]

Thanks a lot Chris.

[Pete Brown]

What's the recommended approach for silencing the piezo? Set the frequency to 0? Pete

[Chris Walker]

Hi Pete,

What's the recommended approach for silencing the piezo? Set the frequency to 0?

Yes. For LEDs, changing the color to "0,0,0" will turn off the LED. Piezos follow a similar concept.

Should we think about adding a .Mute() function in the future?

Chris

[Pete Brown]

Thanks Chris. No. I'm not a big fan of APIs with two functions doing identical work unless the context really requires it. Just add to driver intellisense docs for RGB LED and Piezo. Pete

[Christopher Clark]

I received my piezo buzzer module today, and when I went to use it, I found something interesting. If I try to use it in Socket 6, I get System Exception. If I try to use it in Socket 2, it works. My setup: Socket 1: Button Socket 3: Pot Socket 4: rgbLed Any reason I needed to use it in the first set of sockets?

[Chris Walker]

Hi Christopher, That's very odd. It should work equally well in any of the GoPorts (sockets) on your mainboard. If you use the Piezo Buzzer by itself on the second set of ports, does it still throw the exception? Thanks for letting us know about this! Chris

[Patrick van Es]

Hi Guys, I'm searching for a buzzer module for a gadgeteer project, can anyone tell me if this Piezo buzzer can work with gadgeteer (Fez Spider) as well? Thx!

[Chris Walker]

Hi Patrick,

Hi Guys, I'm searching for a buzzer module for a gadgeteer project, can anyone tell me if this Piezo buzzer can work with gadgeteer (Fez Spider) as well?

The Piezo Buzzer module for Netduino Go is a plug-and-play module using GoBus, so it's really designed to specifically work with Netduino Go.

That said...if you buy one today it will be running GoBus 1.0. And in this particular case, you could grab the Netduino Go source (from the Downloads page) and use the Piezo Buzzer on a non-derated "S" socket on your Gadgeteer mainboard. Be sure to put pins 3-5 of the Gadgeteer module in "input, no pullup" or "open-drain high-z" mode.

You'll need to hack up the code a bit, but it's technically possible.

One critical requirement, if hacking these to work on a Gadgeteer mainboard, is to use these on an "S" socket which does not share pins with another socket. Otherwise the module can get unintended operations or, at worst, 5V signals which are too high for the 3.3V MCU inputs.

Just FYI, the Piezo Buzzer modules will receive an update to GoBus 1.5 later this year... You could still downgrade them to the GoBus 1.0 firmware if you need to hack more this way, but for best experience you'll want to use them with a GoBus-compliant mainboard.

Chris

[Patrick van Es]

Chris, thanks for your answer. For now, I look further for a gadgeteer Piezo module, but I keep in mind that it technically should / could work. Patrick