我们大家可能都有过这样的遭遇:因为做其它事情,忘记了煤气灶上煮的东西,使东西煮糊了或者水烧干了;午睡担心睡过了头。如果你有一个定时器,在你设定的时间到达时提醒你,你就再也不用担心了。本文介绍一个用AT89C2051单片机制作的倒计数定时器,可在1￣99分钟内设置定时时间,时? All of us may have had the experience of forgetting something boiled on a gas cooker, making something boil or water boil, doing something else, nap nap worried over his head. If you have a timer that reminds you when the time you set has arrived, you no longer have to worry about it. This article describes a countdown timer made with the AT89C2051 microcontroller can be set within 1 to 99 minutes timing time?