A stereo VU meter built with an Arduino Nano and two NeoPixel LED rings.

A simple Arduino Morse code machine with a button, LED, and a buzzer that translates your input into English while you are typing.

Build a real, playable theremin music instrument. The theremin is played using two antennas without physical contact.

A simple sound monitoring system using a microphone and a small amplifier with LM386.

This trick teaches you how to use Micro SD/SD card for Arduino and speaker.

Library & sketches to control the TEA5767 FM radio module, using Arduino and an I2C LCD display. Release 02.00.00 is an arduino library.

Type Morse code on Arduino and display it on your computer's monitor.

Create a Bluetooth MIDI controller with an Arduino 101.