数码管是一种半导体发光器件，其基本单元是发光二极管。数码管按段数可分为七段数码管和八段数码管，八段数码管比七段数码管多一个发光二极管单元，也就是多一个小数点（DP）这个小数点可以更精确的表示数码管想要显示的内容 8段LED在控制系统中应用最为广泛，其接口电路也具有普遍借鉴性。因此，本系统使用8段数码管。(The digital tube is a semiconductor light emitting device. Its basic unit is a light emitting diode. According to the number of digital tube can be divided into seven digital tube and eight digital tube, eight digital tube seven segment digital tube more than a light emitting diode unit is a decimal point (DP) of the decimal point can be a more accurate representation of the digital tube to display the content
The 8 segment LED is the most widely used in the control system, and its interface circuit also has universal reference. Therefore, the system uses 8 sections of digital tube.)