自己用51单片机实现的一个多种功能万年历，具备基本的日期，时钟显示，闹钟功能；同时还带有室温检测，亮度及异常温度报警等功能；液晶背光可自动调节，有夜间与白天两种模式。-Own a single chip with 51 calendar functions, with the basic date, clock display, alarm clock function but also with a room temperature detection, brightness, and ab

本文件有三个外部中断函数实现了一个功能，即切换LCD的背光亮灭。当按下任意一个按键时，背光状态改变。 本文件的串口输入中断函数实现了一个功能，即回显输入字符。-This document has three external interrupt function implements a function, that is, switching the LCD back light off. When any button is pressed, the backlight state ch

4.3" lcd backlight driving with pwm of stm32-4.3" lcd backlight driving with pwm of stm32