Sound

• ArduinoReaction game 30 Oct 2026 A reaction game on the Arduino: a state machine with switch and case, a random wait with random(), timing with millis() and sounds with tone() that don't wait
• InfoBuzzer and speaker 13 Nov 2026 Active and passive buzzers and speakers: telling them apart, tone() on an Arduino, playing a melody, and why a speaker needs a transistor or an amplifier.
• ProjectsSoundLab 17 Dec 2025 SoundLab: a small musical instrument with an Arduino, potentiometers and an LM386 amplifier. We explore making sound, gain, noise and the power supply.