实现功能：　　

控制2个气缸，没有任何传感器。第1个气缸先伸出去，1秒钟后再收回来。然后第2个气缸再伸出去，1秒钟后再收回来，算完成一个过程，然后重头开始循环下去。每一个过程要计数加1显示在右边的4位数码管上，左边的4位数码管显示设定的最大计数上限，一旦超过这个计数上限就自动停止。有4个按键，一个按键用来启动，一个按键用来急停。另外两个按键是加减按键，用来设置左边显示的最大计数上限。断电要求数据不丢失。如果同时按下加减两个按键，可以清零当前计数的内容。这4个按键都是独立按键。S1键是加键，S2键是减键，S3键是启动键，S4键是急停键。其中74HC595驱动丝印为D1的LED灯模拟第1个气缸，丝印为D2的LED灯模拟第2个气缸。-To realize the function of:







2 cylinder, no sensor control. The first cylinder first out, back in 1 seconds after the harvest. Then the second cylinder and then back out, 1 seconds after the close, complete a process, and then start the cycle continues. Each process to count 1 shows in 4 digital tube on the right side, 4 digital tube display on the left side of the maximum count limit, once exceed this limit will automatically stop counting. There are 4 buttons, a button to start, a key to stop. In addition two buttons and button is used to set the upper limit, the maximum count shown on the left. The power requirements of the data is not lost. If you subtract two keys pressed at the same time, the count of the content can be cleared. The 4 key is independently pressed key. The S1 key is key, the S2 key is down button, S3 button is the start button, the S4 button is the emergency stop button. The 74HC595 driver for LED D1 simulation of light screen first cylinder, screen printing