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This is Lesson 10 in the Learn Arduino Adafruit series. In this lesson, you will learn how to make sounds with your Arduino. First you will make the Arduino play a 'musical' scale and then combine this with a photocell, to make a Theramin-like instrument that changes the pitch played as you wave your hand over the photocell.
This is Lesson 8 in the Learn Arduino Adafruit series. In this lesson, you will be start of using the Serial Monitor to display analog readings, and then extend the project using eight LEDs from lesson 4, so that you can control the number of LEDs that are lit by turning the knob on a variable resistor.