SKILL BUILDER

MODERATE

From "bit banging" to morphing and fading.

Written by Jon Thompson

TOOLS & MATERIALS

» Arduino Nano v3.0 microcontroller board

» solderless breadboard

» Capacitor, 0.1µF ceramic

» Resistor, 10kΩ

» speaker, 8Ω, approx. 4cm diameter

» NPN transistor, BC548 type or similar

» LED (optional)

» Computer running Arduino IDE software free from arduino.cc

» Mini-B USB cable

» Oscilloscope If you don’t have access to a hardware oscilloscope, check out Christian Zeitnitz’s Soundcard Scope software.

» Code listings 1–6 Each is a complete running Arduino sketch. Download them from makezine. com/35.

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