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 turned by the respective light emitting diodes to get a digital decoder circuit, which is its job principle.