https://toorun.dev/tags/music/Recent content in music on toorun.devHugo -- gohugo.ioen-usFri, 23 Oct 2026 10:00:00 +0000https://toorun.dev/posts/music-notes-frequency-pwm-arduino-piezo/Fri, 23 Oct 2026 10:00:00 +0000https://toorun.dev/posts/music-notes-frequency-pwm-arduino-piezo/Music Notes and Frequency: Generate Do-Re-Mi with PWM on Arduino A musical note is a sound that repeats at a particular frequency. A4, the A above middle C, is commonly tuned to 440 Hz. To play that pitch with a microcontroller, make an output pin switch on and off 440 times per second and connect it to a suitable sounder. This practical example uses an Arduino Uno and a passive piezo buzzer to play a C major scale: Do, Re, Mi, Fa, Sol, La, Ti, Do.