3.22个例程代码四位数码管

1、例程 16这次进行的实验是使用 arduino 驱动一块共阳四位数码管。驱动数码管限流电阻肯定是必不可少的，限流电阻有两种接法，一种是在 d1-d4阳极接，总共接 4 颗。这种接法好处是需求电阻比较少，但是会产生每一位上显示不同数字亮度会不一样，1 最亮，8 最暗。另外一种接法就是在其他 8 个引脚上接，这种接法亮度显示均匀，但是用电阻较多。本次实验使用 8 颗 220 电阻（因为没有 100 电阻，所以使用 220 的代替，100 欧姆亮度会比较高）。4 位数码管总共有 12 个引脚，小数点朝下正放在面前时，左下角为1,其他管脚顺序为逆时针旋转。左上角为最大的 12 号管脚。下图为数码管的说

2、明手册下面是硬件连接图ARDUINO CODECOPY1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40./设置阴极接口a b c d e f g p=1;2;3;4;5;6;7;8;/设置阳极接口d4 d3 d2 d1=9;10;11;12;/设置变量long n = 0;x = 100;del = 55;/此处数值对时钟进行微调voidp p p p p p p p p p p psetup()ode(d1, ode(d2

3、, ode(d3, ode(d4,OUTPUT); OUTPUT); OUTPUT); OUTPUT);ode(a,ode(b,ode(c,ode(d,ode(e,ode(f,ode(g,ode(p,OUTPUT); OUTPUT); OUTPUT); OUTPUT); OUTPUT); OUTPUT); OUTPUT); OUTPUT);voidloop()clearLEDs(); pickDigit(1); pickNumber(n/x/1000)%10);41.42.43.44.45.46.47.48.49.50.51.52.53.54.55.56.57.58.59.60.61.62.6

4、3.64.65.66.67.delayMicroseconds(del);clearLEDs(); pickDigit(2); pickNumber(n/x/100)%10); delayMicroseconds(del);clearLEDs(); pickDigit(3); dispDec(3); pickNumber(n/x/10)%10); delayMicroseconds(del);clearLEDs(); pickDigit(4); pickNumber(n/x%10); delayMicroseconds(del);n+;if (digitalRead(13) = HIGH)n

5、= 0;x) /定义 pickDigit(x),其作void pickDigit(用是开启 dx 端口68.69.70.71.72.73.74.75.76.77.78.79.80.81.digitalWrite(d1, digitalWrite(d2, digitalWrite(d3, digitalWrite(d4,LOW);LOW);LOW);LOW);switch(x)case 1:digitalWrite(d1, HIGH); break;case 2:digitalWrite(d2, HIGH); break;82.83.84.85.86.87.88.89.90.91.case 3:

6、digitalWrite(d3, HIGH); break;default: digitalWrite(d4, HIGH); break;void pickNumber(x)/定义 pickNumber(x),其作用是显示数字 x92.93.94.95.96.97.98.99.100.101.102.103.104.105.106.107.108.109.110.111.112.113.114.115.116.117.118.119.120.121.122.switch(x)default: zero(); break;case 1: one(); break;case 2: two(); b

7、reak;case 3: three(); break;case 4: four(); break;case 5: five(); break;case 6: six(); break;case 7: seven(); break;case 8: eight(); break;case 9:123.124.125.126.127.128.129.130.131.132.133.134.135.136.137.138.139.140.141.142.143.144.145.146.147.148.149.150.151.152.153.154.155.156.157.158.159.160.16

8、1.162.nine(); break;void dispDec(x)/设定开启小数点digitalWrite(p,LOW);/清屏void clearLEDs()digitalWrite(a, digitalWrite(b, digitalWrite(c, digitalWrite(d, digitalWrite(e, digitalWrite(f, digitalWrite(g, digitalWrite(p,HIGH);HIGH);HIGH);HIGH);HIGH);HIGH);HIGH);HIGH);void zero()/定义数字 0 时阴极那些管脚开关digitalWrite(a,

9、 digitalWrite(b, digitalWrite(c, digitalWrite(d, digitalWrite(e, digitalWrite(f, digitalWrite(g,LOW);LOW);LOW);LOW);LOW);LOW);HIGH);void one() /定义数字 1 时阴极那些管脚开关digitalWrite(a, digitalWrite(b, digitalWrite(c, digitalWrite(d, digitalWrite(e,HIGH);LOW);LOW);HIGH);HIGH);163.164.165.166.167.168.169.170.1

10、71.172.173.174.175.176.177.178.179.180.181.182.183.184.185.186.187.188.189.190.191.192.193.194.195.196.197.198.199.200.201.202.digitalWrite(f, HIGH);digitalWrite(g, HIGH);void two()/定义数字 2 时阴极那些管脚开关digitalWrite(a, digitalWrite(b, digitalWrite(c, digitalWrite(d, digitalWrite(e, digitalWrite(f, digita

11、lWrite(g,LOW);LOW);HIGH);LOW);LOW);HIGH);LOW);void three() /定义数字 3 时阴极那些管脚开关digitalWrite(a, digitalWrite(b, digitalWrite(c, digitalWrite(d, digitalWrite(e, digitalWrite(f, digitalWrite(g,LOW);LOW);LOW);LOW);HIGH);HIGH);LOW);void four() /定义数字 4 时阴极那些管脚开关digitalWrite(a, digitalWrite(b, digitalWrite(c,

12、 digitalWrite(d, digitalWrite(e, digitalWrite(f, digitalWrite(g,HIGH);LOW);LOW);HIGH);HIGH);LOW);LOW);void five()/定义数字 5 时阴极那些管脚开关digitalWrite(a, LOW);203.204.205.206.207.208.209.210.211.212.213.214.215.216.217.218.219.220.221.222.223.224.225.226.227.228.229.230.231.232.233.234.235.236.237.238.239.2

13、40.241.242.243.digitalWrite(b, digitalWrite(c, digitalWrite(d, digitalWrite(e, digitalWrite(f, digitalWrite(g,HIGH);LOW);LOW);HIGH);LOW);LOW);void six() /定义数字 6 时阴极那些管脚开关digitalWrite(a, digitalWrite(b, digitalWrite(c, digitalWrite(d, digitalWrite(e, digitalWrite(f, digitalWrite(g,LOW);HIGH);LOW);LOW

14、);LOW);LOW);LOW);void seven()/定义数字 7 时阴极那些管脚开关digitalWrite(a, digitalWrite(b, digitalWrite(c, digitalWrite(d, digitalWrite(e, digitalWrite(f, digitalWrite(g,LOW);LOW);LOW);HIGH);HIGH);HIGH);HIGH);void eight()/定义数字 8 时阴极那些管脚开关digitalWrite(a, digitalWrite(b, digitalWrite(c, digitalWrite(d, digitalWrite(e, digitalWrite(f, digitalWrite(g,LOW);LOW);LOW);LO