数码管由7个发光二极管组成,行成一个日字形,它门可以共阴极,也可以共阳极.通过解码电路得到的数码接通相应的发光二极而形成相应的字,这就是它的工作原理.-Digital governed by seven light-emitting diodes, a day trip into shape, it can be common cathode doors can also be common anode, while the formation of the corresponding word