S11. Output: Piezo speakers

Start Date: Wednesday, February 27, 2013

Due Date: Tuesday, March 5, 2013 at 11:59PM

Before the Lab

You should have experiments with the force sensitive resistor and photosensor to control your LEDs. You should have also used the force sensitive resistor and photosensor to control a Processing program on your computer. Congratulations!

In Lab Exercise

Special Note

If you finish early, please use the extra time to solder some wires onto your motor, which we will be using in the near future.

Objective

Using the piezo to make sound.

Activities

Part 1 – The Piezo Buzzer

1. Connect the Arduino to the Piezo Buzzer.

2. There are two sample programs on the course website. Give them a shot:

• play_melody.txt which plays a song on your speaker
• sound_serial.txt that lets you control the speaker with your keyboard

3. If you want to reduce the volume of the piezo speaker, you can add a resistor in series with the speaker:

Part 2 –Make a Theremin

A Theremin is an instrument designed to be played without being touched. You will make one here using your piezo buzzer and the photosensor.

1. Build the Theremin circuit:

2. The software to control the Theremin can be found here: theremin.txt.

Homework

Input output coincidence exercise. Design an artifact where both input and output occur at the same place. Use any combination of your input transducers and output transducers (pot, photocell, FSR, LEDs, piezo, screen). E.g., a ball that changes colors and/or plays different sound/melody depending on the pressure being applied. A stick you can twist to color or sound differently... These are just examples to spark your imagination. Be creative!

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