说明：  MG323 模块工作电压3.3V-4.2V，推荐工作电压 3.8V，不建议用边缘值电压， 电压波动会造成模块工作不稳定。推荐使用2A以上的 LDO或开关电源。
(MG323 module work voltage 3.3V-4.2V, the Recommended Operating voltage 3.8V, is not recommended with the edge of the value of the voltage, the voltage fluctuation will cause the module job insecurity. Recommended over 2A LDO or switching power supply.)