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Sounds two piezo speakers and flashes three LEDs to the couplet "Shave and a haircut". Tone (Hz) controlled by a knob, with either momentary or toggle activation provided by a switch and button. All parts required included in basic teagueduino kit.
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We are robots.
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2 votes
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This is an 8-bit beat-happy light-based theremin!

Place your hand over the light sensor to change the tone.

Knob 1 controls the relative pitch shift between the two speakers.
Knob 2 controls the note shortness (staccato).
On/Off Swith turn it on and off - it's fun, but it can get annoying if you haven't mastered it yet :)

Rock on!
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My first effort as I try to teach myself how to do this.

There's certainly a more elegant way to do this, but I haven't figured it out yet.

Helps if you have a blow molded WienerMobile (available for $2 at the Henry Ford Museum in Dearborne, MI)
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Make the sound of a heart monitor. The switch starts it, The knob sets the speed of the heart beat, and the button triggers a flat line sound.
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Fun with randomness!
...and a great way to annoy your friends.

When the user presses a button, each piezo speaker randomly plays a random tone.

Var_1 determines how frequently the tones change. Higher numbers make change less likely.
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A quick sketch that waits for the user to press a button then plays a short melody -- Happy Birthday!