Building a Customizable Countdown Timer with Arduino and 3D-Printed Frame

1//First Display Module 
2int a = 5; // connect to pin a of 74LS47
3int b = 4; // connect to pin b of 74LS47
4int c = 3; // connect to pin c of 74LS47
5int d = 2; // connect to pin d of 74LS47
6//second display Module
7int a1 = 6; // connect to pin a of 74LS47
8int b1 = 7; // connect to pin b of 74LS47
9int c1 = 8; // connect to pin c of 74LS47
10int d1 = 9; // connect to pin d of 74LS47
11
12int LED = 13; // connect to pin d of 74LS47
13int Reset=10;
14int Pause=11;
15int startled=12;
16int analogPin = 1;
17void setup() {
18  pinMode(a, OUTPUT);
19  pinMode(b, OUTPUT);
20  pinMode(c, OUTPUT);
21  pinMode(d, OUTPUT);
22
23  pinMode(a1, OUTPUT);
24  pinMode(b1, OUTPUT);
25  pinMode(c1, OUTPUT);
26  pinMode(d1, OUTPUT);
27
28  pinMode(LED, OUTPUT);
29  pinMode(Reset, INPUT);
30  pinMode(Pause, INPUT);
31  pinMode(startled, INPUT);
32  Serial.begin(9600);  
33
34  digitalWrite(startled,LOW);
35}
36int conpin[]={a,b,c,d};
37int conpin1[]={a1,b1,c1,d1};
38byte digitnum[]={B0000,B0001,B0010,B0011,B0100,B0101,B0110,B0111,B1000,B1001};
39int firstdigit=0;
40int seconddigit=0;  
41
42float NewValue=5,OldValue=0,OldMin=01,NewMax=99,NewMin=01,OldMax=1015;
43
44void loop() {
45int   val = analogRead(analogPin);    // read the input pin
46//  Serial.println(val); 
47OldValue=val;
48//NewValue = (((OldValue - OldMin) * (NewMax - NewMin)) / (OldMax - OldMin)) + NewMin;
49NewValue = round(((OldValue) /1014) * 99);
50if(NewValue>99)
51{
52  NewValue=99;
53  }
54int nval=NewValue;
55Serial.println(nval); 
56
57seconddigit=nval%10; 
58firstdigit=nval/10;
59digitalWrite(startled,LOW);
60
61
62Serial.println("Start Button");
63Serial.println(digitalRead(startled));
64
65 for (int j = 0; j <4; j++) 
66    {
67      digitalWrite(conpin[j],bitRead(digitnum[firstdigit],j));
68      digitalWrite(conpin1[j],bitRead(digitnum[seconddigit],j));
69    }
70digitalWrite(LED,LOW);
71digitalWrite(Reset,HIGH);
72if(digitalRead(startled)==0)
73{
74digitalWrite(LED,HIGH);
75digitalWrite(Reset,LOW);
76for(int i=nval;i>=0;i--)
77{
78
79  digitalWrite(LED,HIGH);
80  seconddigit=i%10; 
81  firstdigit=i/10;
82  Serial.println("Counter Value:=");
83  Serial.println(i);
84  
85  Serial.println(firstdigit);
86  Serial.println("seconddigit:=");
87  Serial.println(seconddigit);
88   for (int j = 0; j <4; j++) 
89    {
90      digitalWrite(conpin[j],bitRead(digitnum[firstdigit],j));
91      digitalWrite(conpin1[j],bitRead(digitnum[seconddigit],j));
92    }
93if(digitalRead(Pause)==0)
94{
95  digitalWrite(LED,LOW);
96  delay(15000);
97}
98if(digitalRead(Reset)==0)
99{
100  break;
101  }
102 delay(1000);
103   }
104}
105 delay(1000); 
106}