Arduino:1.8.5 (Windows 7), 开发板:"Arduino/Genuino Uno"
C:\Users\Administrator\Documents\Arduino\sketch_jun13a\sketch_jun13a.ino: In function 'void loop()':
sketch_jun13a:15: error: 'voltage' was not declared in this scope
Serial.println(voltage);
^
exit status 1
'voltage' was not declared in this scope
获取模拟信号出现这个错误信息是什么原因,本人刚刚接触单片机,希望大家多帮助,谢谢
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