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Amazon.com: SunFounder FruitKey USB Keyboard DIY Starter Kit Gamepad Control Handle DIY Computer Keyboard, Worked with PC Mac OS X Raspberry Pi for Arduino Uno R3 Leonardo : Electronics
GitHub - nicholasbester/arduino-keyboard-instrument: A Keyboard instrument made using pushbuttons and a piezo speaker on an Arduino http://www.nickbester.com
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kc11c04 ad keyboard analog button 4-key module suitable for arduino uno mega2560 sensor expansion board - AliExpress
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