1. int pin_pot=A0;
2. int AD_value=0;
3. int brzina;
4. int nDelayMicroseconds = 50;
5. int d1 = 8;
6. int d2 = 9;
7. int d3 = 10;
8. int d4 = 11;
9. int data;
10. int segData;
11. void setup() {
12.   DDRD= B11111111;
13.   DDRB= B11111111;
14.   pinMode(pin_pot,INPUT);
15. }
16. void loop() {
17.   int d1, d2, d3, d4;
18.   d1 = data / 1000 % 10; //Znamenka tisućice
19.   d2 = data / 100 % 10; //Znamenka stotice
20.   d3 = data / 10 % 10; //Znamenka desetice
21.   d4 = data % 10;
22.   data=analogRead(pin_pot);
23.   for (int m = 0; m<80; m++) {
24.     segData = DigitTo7SegEncoder(d1, 1);
25.     pickDigit(1); //Selection of a digital display
26.     PORTD = segData;
27.     delayMicroseconds(nDelayMicroseconds);
28.     segData = DigitTo7SegEncoder(d2, 1);
29.     pickDigit(2); //Select the first two digital display
30.     PORTD = segData;
31.     delayMicroseconds(nDelayMicroseconds);
32.     segData = DigitTo7SegEncoder(d3, 1);
33.     pickDigit(3); //Select the first three digital display
34.     PORTD = segData;
35.     delayMicroseconds(nDelayMicroseconds);
36.     segData = DigitTo7SegEncoder(d4, 1);
37.     pickDigit(4); //Select the first four digital display
38.     PORTD = segData;
39.     delayMicroseconds(nDelayMicroseconds);
40.   }
41. }
42. void pickDigit(int x) //Defined pickDigit (x), whose role is to open the port dx
43. {
44. digitalWrite(d1, HIGH);
45. digitalWrite(d2, HIGH);
46. digitalWrite(d3, HIGH);
47. digitalWrite(d4, HIGH);
48. switch (x)
49. {
50. case 1:
51. digitalWrite(d1, LOW);
52. break;
53. case 2:
54. digitalWrite(d2, LOW);
55. break;
56. case 3:
57. digitalWrite(d3, LOW);
58. break;
59. default:
60. digitalWrite(d4, LOW);
61. break;
62. }
63. }
64. unsigned char DigitTo7SegEncoder(unsigned char digit, unsigned char common)
65. {
66. unsigned char SegVal;
67. switch (digit)
68. {
69.  case 0: if (comm 1) SegVal = 0b00111111; // broj 0
70. else SegVal = ~0b00111111;
71. break;
72.  case 1: if (comm 1) SegVal = 0b00000110; // broj 1
73. else SegVal = ~0b00000110;
74. break;
75.  case 2: if (comm 1) SegVal = 0b01011011; // broj 2
76. else SegVal = ~0b01011011;
77. break;
78.  case 3: if (comm 1) SegVal = 0b01001111; // broj 3
79. else SegVal = ~0b01001111;
80. break;
81.  case 4: if (comm 1) SegVal = 0b01100110; // broj 4
82. else SegVal = ~0b01100110;
83. break;
84.  case 5: if (comm 1) SegVal = 0b01101101; // broj 5
85. else SegVal = ~0b01101101;
86. break;
87.  case 6: if (comm 1) SegVal = 0b01111101; // broj 6
88. else SegVal = ~0b01111101;
89. break;
90.  case 7: if (comm 1) SegVal = 0b00000111; // broj 7
91. else SegVal = ~0b00000111;
92. break;
93.  case 8: if (comm 1) SegVal = 0b01111111; // broj 8
94. else SegVal = ~0b01111111;
95. break;
96.  case 9: if (comm 1) SegVal = 0b01101111; // broj 9
97. else SegVal = ~0b01101111;
98. }
99. return SegVal;
100. }