Add piezo electric buzzer

[gfeun]

[urish]

Thanks @gfeun! How does this buzzer works? It seems like it has a small MOSFET, and I guess that the resistor is connected to the gate of the mosfet?

[gfeun]

I don't know the implementation details. The physical principal is really simple and you may already know it. It uses the piezo electric property of a material which vibrates when current is applied to it.
So when you apply an electric signal with a given frequency to it, it results in a sound of corresponding frequency.

We have a practical course where we teach students how to generate a signal of a given frequency using timers and apply it to a buzzer. We then ask the students to create a small piano using our 8 push buttons generating signals of different frequencies (resulting in different sounds).

I'd like to make this possible to implement using avr8js.
Luckily you have already done most of the work as I've seen here 😄

[urish]

And now it's even being used! 🔊

https://wokwi.com/playground/spaceship-game