基于STM32103RC开发板的实时时钟实验，能保存年月日时分秒，外部电池可供电，确保数据在掉电下不消失-STM32103RC development board based on the real-time clock experiments, when the minutes and seconds can save date, external battery power supply, ensure that data is not lost in power-down under

0.96OLED显示屏_STM32F103RC_IIC(096OLED26174;` 31034;`23631;u STM32F103RC)