基于51单片机的16个按键的简易电子琴 电子琴共16个按键，对应“低音3”、“低音4”、…、“低音7”、“1”、“2”、…、“7”、“高音1”、“高音2”、…“高音4”，分别对应按键K1～K16。(A simple electronic organ based on 16 keys of 51 Singlechip The electronic keyboard has 16 buttons, corresponding to "bass 3", "bass 4