说明：  三个串口+波形例子，第一个是串口+读取温度同时显示温度值，第二个是串口+读取两中温度值并计算它们之间的差值，同时进行显示，第三个是读取电压值并显示电压值
(Three serial+ waveform example, the first is the serial+ to read temperature display temperature values ​ ​ at the same time, the second serial+ read two temperature values ​ ​ and calculate the difference between them, are displayed at the same time, the third is the read voltage value and voltage value)