如何使用一位数码管显示数字

如何使用一位数码管显示数字经验分享

首先需要了解一位数码管结构。

共阳极和共阴极数码管，公共端为中间的引脚。共阴极数码管需要将公共端接GND，共阳极数码管需要将公共端接VCC。

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（多一个小数点）

共阳数码管是指将所有发光二极管的阳极接到一起形成公共阳极(COM)的数码管。共阳数码管在应用时应将公共极COM 接到+5V，当某一字段发光二极管的阴极为低电平时，相应字段就点亮。当某一字段的阴极为高电平时，相应字段就不亮。共阴数码管是指将所有发光二极管的阴极接到一起形成公共阴极(COM)的数码管。共阴数码管在应用时应将公共极COM 接到地线GND 上，当某一字段发光二极管的阳极为高电平时，相应字段就点亮。当某一字段的阳极为低电平时，相应字段就不亮

void setup()

{

pinMode( 3 , OUTPUT);

pinMode( 4 , OUTPUT);

pinMode( 5 , OUTPUT);

pinMode( 6 , OUTPUT);

pinMode( 7 , OUTPUT);

pinMode( 8 , OUTPUT);

pinMode( 9 , OUTPUT);

}

void loop()

{

digitalWrite( 3 , HIGH );

digitalWrite( 4 , HIGH );

digitalWrite( 5 , HIGH );

digitalWrite( 6 , HIGH );

digitalWrite( 7 , LOW );

digitalWrite( 8 , HIGH );

digitalWrite( 9 , HIGH );

delay(1000);

digitalWrite( 3 , HIGH );

digitalWrite( 4 , HIGH );

digitalWrite( 5 , HIGH );

digitalWrite( 6 , HIGH );

digitalWrite( 7 , HIGH );

digitalWrite( 8 , HIGH );

digitalWrite( 9 , HIGH );

delay(1000);

digitalWrite( 3 , HIGH );

digitalWrite( 4 , HIGH );

digitalWrite( 5 , HIGH );

digitalWrite( 6 , LOW );

digitalWrite( 7 , LOW );

digitalWrite( 8 , LOW );

digitalWrite( 9 , LOW );

delay(1000);

digitalWrite( 3 , HIGH );

digitalWrite( 4 , LOW );

digitalWrite( 5 , HIGH );

digitalWrite( 6 , HIGH );

digitalWrite( 7 , HIGH );

digitalWrite( 8 , HIGH );

digitalWrite( 9 , HIGH );

delay(1000);

digitalWrite( 3 , HIGH );

digitalWrite( 4 , LOW );

digitalWrite( 5 , HIGH );

digitalWrite( 6 , HIGH );

digitalWrite( 7 , LOW );

digitalWrite( 8 , HIGH );

digitalWrite( 9 , HIGH );

delay(1000);

digitalWrite( 3 , LOW );

digitalWrite( 4 , HIGH );

digitalWrite( 5 , HIGH );

digitalWrite( 6 , LOW );

digitalWrite( 7 , LOW );

digitalWrite( 8 , HIGH );

digitalWrite( 9 , HIGH );

delay(1000);

digitalWrite( 3 , HIGH );

digitalWrite( 4 , HIGH );

digitalWrite( 5 , HIGH );

digitalWrite( 6 , HIGH );

digitalWrite( 7 , LOW );

digitalWrite( 8 , LOW );

digitalWrite( 9 , HIGH );

delay(1000);

digitalWrite( 3 , HIGH );

digitalWrite( 4 , HIGH );

digitalWrite( 5 , LOW );

digitalWrite( 6 , HIGH );

digitalWrite( 7 , HIGH );

digitalWrite( 8 , LOW );

digitalWrite( 9 , HIGH );

delay(1000);

digitalWrite( 3 , LOW );

digitalWrite( 4 , HIGH );

digitalWrite( 5 , HIGH );

digitalWrite( 6 , LOW );

digitalWrite( 7 , LOW );

digitalWrite( 8 , LOW );

digitalWrite( 9 , LOW );

delay(1000);

digitalWrite( 3 , HIGH );

digitalWrite( 4 , HIGH );

digitalWrite( 5 , HIGH );

digitalWrite( 6 , HIGH );

digitalWrite( 7 , HIGH );

digitalWrite( 8 , HIGH );

digitalWrite( 9 , LOW );

delay(1000);

}