桌面时钟小程序源码，有定时关机功能，能查看倒计时-desktop clock source small programs, on a regular basis shutdown, the countdown will View

倒计时程序，时钟置顶显示不影响其他操作，时间到使用全屏提醒，alt+f4关闭窗口。-The countdown clock procedures, the top display does not affect other operations, the time to use full screen to remind, alt+f4 to close the window.

1. 单片机为STM32F051 2. 485通讯式倒计时 3. 协议符合倒计时标准“GAT 508-2004 道路交通信号倒计时显示器”(1. MCU is STM32F051 2.485 communication countdown panel 3. agreement conforms to the countdown standard "GAT 508-2004 road traffic signal countdown display")