https://electwork.net/en/tags/frequency/ Recent content in Frequency on Electronics Lifehack! https://electwork.net/images/ogp-default.jpg?v=3 https://electwork.net/images/ogp-default.jpg?v=3 Hugo -- gohugo.io en Sat, 27 Jun 2020 00:00:00 +0900 https://electwork.net/en/posts/arduino-buzzer-sound/ Sat, 27 Jun 2020 00:00:00 +0900 https://electwork.net/en/posts/arduino-buzzer-sound/ Build an electronic piano with Arduino and a passive piezo buzzer using tone(). How tone()/noTone() work, a three-octave note-to-frequency table, circuit wiring, sample code, and an auto-play melody demo.