7段数码管显示与对应值计算工具。先点击对应管位，设置显示顺序，再点击生成即可获得键值。鼠标选择键值，数码管相应显示。-7-segment LED display with the corresponding value calculation tools. Firstly, click the corresponding tube in the LED, in order to set the display order. Then click Generate to get the value. After created, select the key and the digital will show the char accordingly.