Driving a piezo with the sound function

[rsocor01]

Hi,

I also bought me a piezo buzzer from mouser (see link below) and using it with the commands SOUND and FREQOUT at the resonance frequency 4MHz didn't help too much. The sound was very low. It was even worst when I installed the PCB board with the buzzer attached to it inside a plastic enclosure. Inside the enclosure you can barely hear the buzzer.

I will give it a try to Melany suggestion of using a square wave for the buzzer.

Robert

http://www.mouser.com/Search/Product...ub80XcMw%3d%3d

[falingtrea]

At the end of the data sheet is a suggested driver circuit. You may also want to try it. The data does not show any current requirements for thsi part so maybe the PIC can't drive it hard enough?

[wjsmarine]

Hi Folks,

I use the piezo transducer types (need to be frequency driven) and find a small coil across the transducer works well as these sensors (yes they make good vibration detectors too!!) are capacitive. Some experimentation is required for the value of the coil inductance but these can easily be made.

Note a current limiting resistor is now needed in series to safeguard the PIC pin as the coil basically makes the output a short circuit.

HTH,
Bill

[Jerson]

This is how my piezo speaker is driven. The speaker connects between BUZZ and the ground.

[Ioannis]

Risky Jerson!

Does anyone know the relation between the numbers and the freq. in the SOUND command?

Ioannis