Time for the tone lab.

An Arduino connected to a breadboard with photoresistors and a speaker

  1. The photoresistors gave me an input range from 33 to 668.

    I could only scrounge up a 16 ohm speaker. It was really quiet, so I substituted a 220 ohm resistor in place of the 1K ohm resistor specified in the schematic. This gave the volume a bump.

  2. Basic tone production using a photocell-based voltage divider

  1. Playing series of tones