Nixie Clock with Arduino | Simplest Design

1//Youtube channel: engineer2you
2#include <Wire.h>
3#include "DS3231.h"
4
5RTClib  RTC;
6DS3231 Clock;
7
8int hour;
9int minute;
10int second;
11
12const  int nixie_0 = 2;
13const int nixie_1 = 3;
14const int nixie_2 = 4;
15const int  nixie_3 = 5;  
16const int nixie_4 = 6;
17const int nixie_5 = 7;
18const int  nixie_6 = 8;
19const int nixie_7 = 9;
20const int nixie_8 = 10;
21const int nixie_9  = 11;
22
23const int row_1 = 0;
24const int row_2 = 1;
25const int row_3 = 14;
26const  int row_4 = 15;
27const int row_5 = 16;
28const int row_6 = 17;
29
30const int  time_on = 2;
31
32void setup() {
33  pinMode(nixie_0, OUTPUT);
34  pinMode(nixie_1,  OUTPUT);
35  pinMode(nixie_2, OUTPUT);
36  pinMode(nixie_3, OUTPUT);
37  pinMode(nixie_4,  OUTPUT);
38  pinMode(nixie_5, OUTPUT);
39  pinMode(nixie_6, OUTPUT);
40  pinMode(nixie_7,  OUTPUT);
41  pinMode(nixie_8, OUTPUT);
42  pinMode(nixie_9, OUTPUT);
43  pinMode(row_1,  OUTPUT);
44  pinMode(row_2, OUTPUT);
45  pinMode(row_3, OUTPUT);
46  pinMode(row_4,  OUTPUT);
47  pinMode(row_5, OUTPUT);
48  pinMode(row_6, OUTPUT);
49  //Serial.begin(9600);  //should NOT use seiral println, it will effect to output pin D0 & D1
50  Wire.begin();
51}
52
53void  loop() {
54    //-------------------get clock value---------------------------
55    DateTime now = RTC.now();
56    hour = now.hour();
57    minute = now.minute();
58    second = now.second();
59
60    //-------------------show clock number ----------------------
61    int j; //second number from right
62    int k; //first number from right
63
64      j = second/10;
65      k = second%10;
66      //-----------show first number  of second
67      off_all();
68      on_number(0,k+2);
69      delay(time_on);
70      //-----------show second number of second
71      off_all();
72      on_number(1,j+2);
73      delay(time_on);
74      
75      j = minute/10;
76      k = minute%10;
77      //-----------show first number of minute
78      off_all();
79      on_number(14,k+2);  
80      delay(time_on);
81      //-----------show second number of minute
82      off_all();
83      on_number(15,j+2);
84      delay(time_on);
85
86      j  = hour/10;
87      k = hour%10;
88      //-----------show first number of hour
89      off_all();
90      on_number(16,k+2); 
91      delay(time_on);
92      //-----------show  second number of hour
93      off_all();
94      on_number(17,j+2);
95      delay(time_on);
96}
97
98void  on_number(int row, int nixie){
99  digitalWrite(row, HIGH);
100  digitalWrite(nixie,  HIGH);
101}
102
103void off_all(){
104  digitalWrite(row_1, LOW);
105  digitalWrite(row_2,  LOW);
106  digitalWrite(row_3, LOW);
107  digitalWrite(row_4, LOW);
108  digitalWrite(row_5,  LOW);
109  digitalWrite(row_6, LOW);
110  digitalWrite(nixie_0, LOW);
111  digitalWrite(nixie_1,  LOW);
112  digitalWrite(nixie_2, LOW);
113  digitalWrite(nixie_3, LOW);
114  digitalWrite(nixie_4,  LOW);
115  digitalWrite(nixie_5, LOW);
116  digitalWrite(nixie_6, LOW);
117  digitalWrite(nixie_7,  LOW);
118  digitalWrite(nixie_8, LOW);
119  digitalWrite(nixie_9, LOW);
120
121  delayMicroseconds(400);  //to prevent "ghost" effect to other tube
122}