Show and Tell!courses.ischool.berkeley.edu/i290-4/f08/slides/Thursday_Week6_Piezo_buzzer.pdfThursday...

Thursday Week 6: Piezo Buzzers Theory and Practice of Tangible User Interfaces

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Show and Tell!

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Output 1: Making SoundPiezo buzzers

week

06

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Piezo Buzzer

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Piezo Buzzer

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Piezo Buzzer

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period

PW

PW

period

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Frequency (Hz) =

Period (sec)

1

period

PW

* note frequency period PW (timeHigh)

* c 261 Hz 3830 1915 * d 294 Hz 3400 1700 * e 329 Hz 3038 1519 * f 349 Hz 2864 1432 * g 392 Hz 2550 1275 * a 440 Hz 2272 1136 * b 493 Hz 2028 1014 * C 523 Hz 1912 956

PW

period(microseconds)

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period

PW

PW

period

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1. Connect your piezo buzzer 2. Play sound3. Make a Theremin 4. Solder wires to a motor (for next Thursday)

In Class Exercise

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1. Connect your piezo buzzer

Polarity matters!

black = ground

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1. Connect your piezo buzzer 2. Play sound3. Make a Theremin 4. Solder wires to a motor (for next Thursday)

In Class Exercise

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2. Play Sound

sound_serial

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c d e f g a b C

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2. Play Sound

play_melody

If you want to make it quieter, add a resistor.

10k

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c d e f g a b C

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1. Connect your piezo buzzer 2. Play sound3. Make a Theremin 4. Solder wires to a motor (for next Thursday)

In Class Exercise

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Theremin (by Leon Theremin)

Measures the body’s electric field.

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Your Theremin

theremin

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1. Connect your piezo buzzer 2. Play sound3. Make a Theremin 4. Solder wires to a motor (for next Thursday)

In Class Exercise

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c d e f g a b C

Let’s try to make beautiful music!

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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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Announcement

Programming course by PatrickThursday, October 27, 2008 6:00PM in 110 South Hall

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Thanks!