Arduino Piezo Buzzer Tutorial
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The DIY Arduino keyboard or the Musical-duino has a few buttons. Pressing them makes different tones according to the pulse sent to it by the Arduino. Your Arduino can be used to make different instruments. It can even be used to make a proximity sensing device to help blind people, a device that detects obstacles and makes different voices depending on what they're approaching. You can also make a Theremin out of an Arduino by attaching LDRs.
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