Input / Output Coincidence Lab Assignment

Description:
In this lab I created a instrument that, when the matchbox slid back and forth, the sound of the piezzo speaker would warp.  The matchbox basically serveda as a sensor tool, letting the light come into the matchbox and therefore the sensor reads different frequencies. 
Materials:
Arduino
Breadboard
Wires
Piezzo speaker
Matchbox
Resistors
Code:
 

Description
I have multiple lines being drawn at various lengths. Their colors depend on how much light I shine on the photocell. I used my last assignment as a template for this one.
 
Materials
1 - photocell
1 - arduino
1- 10k resistor
 
Code

Description

In this assignment, I designed an interactive ring which creates a buzzing noise when it's taken off. To accomplish this, I attached the Piezo speaker on top and attached the photocell to the bottom of the ring. When the ring is worn, the light reading will go under a certain threshold and the speaker will be turned off. 

Input Output Conicidence
 
The purpose of the lab was to build a device that had input output coincidence. As part of the in class work we used the piezzo speakers as output devices. But I came across a feature that the PIezzo speakers can be used to sense taps. So I wanted to play with this feature of the piezo speaker and use LED's as output for my IO coincidence device.

DESCRIPTION
In this lab, we used a piezo buzzer to play a set melody and play notes using our keyboard. Then, we attached a photocell to our circuit to make a Theremin.
 
For homework, I designed  music box which plays "London Bridge is Falling Down." The song will play when the top of the dial is touched. The song will keep repeating itself until the top of the dial is released. At that time, the song will finish playing then stop. The dial can be turned to control the volume of the song.
 

Piezo Lab
Description - Use a piezo to make a speaker / 'theremin'.
Procedure. Connect piezo to arduino from a digital output to ground. Connect a resistive sensor to and analogPin with a basic voltage divider circuit. Map analog input to tone output for the piezo. 
Syringe