Arduino Sine Wave: Piezo Buzzer Possible?

AI Thread Summary
An Arduino can produce a sine wave for a piezoelectric buzzer using an R-2R ladder DAC setup and a look-up table for waveform generation. The output may require buffering with an op-amp to meet the current demands of the buzzer. Some piezo buzzers operate on DC input, so understanding the specific buzzer's specifications is crucial. The frequency rating on a buzzer indicates its capability rather than the actual output produced. For further guidance, referring to Arduino tutorials on tone generation can be beneficial.
elevfan7072
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Is it possible for an Arduino to produce a sine wave to a piezoelectric buzzer?
 
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elevfan7072 said:
Is it possible for an Arduino to produce a sine wave to a piezoelectric buzzer?

Some piezo buzzers only need a DC input. What are the specs of your piezo buzzer?

You could use an R-2R ladder DAC arrangement, connected to some of the uC's IO lines. Then use a look-up table in the uC to drive a sine wave out the DAC. You may need to buffer that DAC output with an opamp to drive the buzzer, depending on the current required.
 
berkeman said:
Some piezo buzzers only need a DC input. What are the specs of your piezo buzzer?

You could use an R-2R ladder DAC arrangement, connected to some of the uC's IO lines. Then use a look-up table in the uC to drive a sine wave out the DAC. You may need to buffer that DAC output with an opamp to drive the buzzer, depending on the current required.

I don't have one yet. When it says (?? hz), does that mean what it's capable of, and not what it actually produces?
 
elevfan7072 said:
I don't have one yet. When it says (?? hz), does that mean what it's capable of, and not what it actually produces?

Can you post a datasheet that you are looking at?

I'm guessing that you put a DC voltage across it, and it produces a tone of that specified frequency (probably with some harmonics too...).
 
A little late but are you you looking for something like this?
http://arduino.cc/en/Tutorial/tone
 

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