This exercise was actually rather useful in preparing for my first project. This circuit shown above is an LDR in series with a piezo sounder. The design is similar to an electronic instrument called the Theramin. It was programmed to play a certain tone depending on the value that the LDR was receiving from its environment. What is not shown in this post is the second exercise of this handout. In this exercise, the LDR was removed, and an LED was placed in series with the piezo sounder instead. The arduino was programmed to play a short tune and the LED flashed along with the notes being played.
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