IIC通信:当接收到ON时点亮D13，当打开OFF时熄灭D13\n\nUNO1(A4)-UNO2(A4)\nUNO1(A5)-UNO2(A5)\nUNO1(GND)-UNO2(GND)4global_variateReceiveStringStringglobal_variateLED_STAboolean0ReceiveStringWHILETRUE+itemReceiveString1charSerialprintlnReceiveStringEQReceiveStringON13HIGHLED_STA1delay2000EQReceiveStringOFF13LOWLED_STA0delay2000LED_STA1YES0NO