When I started playing with circuits I had 2 different speakers. The first was from a phone and the other was a piezo speaker. When you supply 5V to a speaker it just gives a thud and when you connect and diconnect it quickly you get pulses.

When I connected a piezo speaker it gave a frequency not a thud.

I then bought a Piezoelectric ultrasonic transducer that I hoped would give a mist effect but disappointingly I got nothing .

Would I need some form of pulse to the device to get it to work?

 

there are piezo sounders with built in oscilators (mallory sonalert) that make tones, and pieao speakers too that just reproduce sounds.

 

there are piezo sounders with built in oscilators (mallory sonalert) that make tones, and pieao speakers too that just reproduce sounds.

It appears you need a driver circuit that produces a 1.6mHz that generates the ultrasonic frequencies. Its going to be worth it though