Tutorial link:

https://youtu.be/1LzrtehidOI

This tutorial is a continuation of "STM32 Multiple Buttons ADC Read Through One Pin With Software Button Debounce" Tutorial, STM32 based electronic piano simple project was done using only 2 pins. One pin is configured to operate as ADC to read the status of 7 buttons and the other pin is used to derive a buzzer with a PWM signal. STM32 is programmed to generate a PWM signal with a different frequency when a different button is pressed, which will result in generating 7 different sounds. These sounds are actually the musical notes.