Simple hardware keyboard In the development of board achieve a simple keyboard, press KEY1 ~ KEY7 seperately DO, the alto RE, MI, FA, SOL, LA, SI Hold KEY8 press again KEY7 seperately KEY1 ~ the treble DO, RE, MI, FA, SOL, LA, SI. Through the experiment, grasps the buzzer and using buttons Design hardware keyboard method.

key_music.docx

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