I am a beginner with coding, and when I run my code, it only shows 4 zeros. I want an on/off button to go with it, and I am stuck figuring it out. Can someone help me?
Here is my code:
//the pins of 4-digit 7-segment display attach to pin2-13 respectively
int a = 2;
int b = 3;
int c = 4;
int d = 5;
int e = 6;
int f = 7;
int g = 8;
int p = 13;
int d1 = 12;
int d2 = 11;
int d3 = 10;
int d4 = 9;
//int dp=14;
long n = 0;// n represents the value displayed on the LED display. For example, when n=0, 0000 is displayed. The maximum value is 9999.
int x = 100;
int del = 5;//Set del as 5; the value is the degree of fine tuning for the clock
int count = 0;//Set count=0. Here count is a count value that increases by 1 every 0.1 second, which means 1 second is counted when the value is 10
void setup()
{
//set all the pins of the LED display as output
pinMode(d1, OUTPUT);
pinMode(d2, OUTPUT);
pinMode(d3, OUTPUT);
pinMode(d4, OUTPUT);
pinMode(a, OUTPUT);
pinMode(b, OUTPUT);
pinMode(c, OUTPUT);
pinMode(d, OUTPUT);
pinMode(e, OUTPUT);
pinMode(f, OUTPUT);
pinMode(g, OUTPUT);
pinMode(p, OUTPUT);
}
/***************************************/
void loop()
{
clearLEDs();//clear the 7-segment display screen
pickDigit(0);//Light up 7-segment display d1
pickNumber((n / 1000)); // get the value of thousand
delay(del);//delay 5ms
clearLEDs();//clear the 7-segment display screen
pickDigit(1);//Light up 7-segment display d2
pickNumber((n % 1000) / 100); // get the value of hundred
delay(del);//delay 5ms
clearLEDs();//clear the 7-segment display screen
pickDigit(2);//Light up 7-segment display d3
pickNumber(n % 100 / 10); //get the value of ten
delay(del);//delay 5ms
clearLEDs();//clear the 7-segment display screen
pickDigit(3);//Light up 7-segment display d4
pickNumber(n % 10); //Get the value of single digit
delay(del);//delay 5ms
}
/**************************************/
void pickDigit(int x) //light up a 7-segment display
{
//The 7-segment LED display is a common-cathode one. So also use digitalWrite to set d1 as high and the LED will go out
digitalWrite(d4, HIGH);
digitalWrite(d3, HIGH);
digitalWrite(d2, HIGH);
digitalWrite(d1, HIGH);
digitalWrite(p, HIGH);
switch (x)
{
case 0:
digitalWrite(d4, LOW);//Light d1 up
break;
case 1:
digitalWrite(d3, LOW); //Light d2 up
break;
case 2:
digitalWrite(d2, LOW); //Light d3 up
break;
default:
digitalWrite(d1, LOW); //Light d4 up
break;
}
}
//The function is to control the 7-segment LED display to display numbers. Here x is the number to be displayed. It is an integer from 0 to 9
void pickNumber(int x)
{
switch (x)
{
default:
zero();
break;
case 1:
one();
break;
case 2:
two();
break;
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:
nine();
break;
}
}
void clearLEDs() //clear the 7-segment display screen
{
digitalWrite(a, LOW);
digitalWrite(b, LOW);
digitalWrite(c, LOW);
digitalWrite(d, LOW);
digitalWrite(e, LOW);
digitalWrite(f, LOW);
digitalWrite(g, LOW);
digitalWrite(p, LOW);
}
void zero() //the 7-segment led display 0
{
digitalWrite(a, HIGH);
digitalWrite(b, HIGH);
digitalWrite(c, HIGH);
digitalWrite(d, HIGH);
digitalWrite(e, HIGH);
digitalWrite(f, HIGH);
digitalWrite(g, LOW);
}
void one() //the 7-segment led display 1
{
digitalWrite(a, LOW);
digitalWrite(b, HIGH);
digitalWrite(c, HIGH);
digitalWrite(d, LOW);
digitalWrite(e, LOW);
digitalWrite(f, LOW);
digitalWrite(g, LOW);
}
void two() //the 7-segment led display 2
{
digitalWrite(a, HIGH);
digitalWrite(b, HIGH);
digitalWrite(c, LOW);
digitalWrite(d, HIGH);
digitalWrite(e, HIGH);
digitalWrite(f, LOW);
digitalWrite(g, HIGH);
}
void three() //the 7-segment led display 3
{
digitalWrite(a, HIGH);
digitalWrite(b, HIGH);
digitalWrite(c, HIGH);
digitalWrite(d, HIGH);
digitalWrite(e, LOW);
digitalWrite(f, LOW);
digitalWrite(g, HIGH);
}
void four() //the 7-segment led display 4
{
digitalWrite(a, LOW);
digitalWrite(b, HIGH);
digitalWrite(c, HIGH);
digitalWrite(d, LOW);
digitalWrite(e, LOW);
digitalWrite(f, HIGH);
digitalWrite(g, HIGH);
}
void five() //the 7-segment led display 5
{
digitalWrite(a, HIGH);
digitalWrite(b, LOW);
digitalWrite(c, HIGH);
digitalWrite(d, HIGH);
digitalWrite(e, LOW);
digitalWrite(f, HIGH);
digitalWrite(g, HIGH);
}
void six() //the 7-segment led display 6
{
digitalWrite(a, HIGH);
digitalWrite(b, LOW);
digitalWrite(c, HIGH);
digitalWrite(d, HIGH);
digitalWrite(e, HIGH);
digitalWrite(f, HIGH);
digitalWrite(g, HIGH);
}
void seven() //the 7-segment led display 7
{
digitalWrite(a, HIGH);
digitalWrite(b, HIGH);
digitalWrite(c, HIGH);
digitalWrite(d, LOW);
digitalWrite(e, LOW);
digitalWrite(f, LOW);
digitalWrite(g, LOW);
}
void eight() //the 7-segment led display 8
{
digitalWrite(a, HIGH);
digitalWrite(b, HIGH);
digitalWrite(c, HIGH);
digitalWrite(d, HIGH);
digitalWrite(e, HIGH);
digitalWrite(f, HIGH);
digitalWrite(g, HIGH);
}
void nine() //the 7-segment led display 9
{
digitalWrite(a, HIGH);
digitalWrite(b, HIGH);
digitalWrite(c, HIGH);
digitalWrite(d, HIGH);
digitalWrite(e, LOW);
digitalWrite(f, HIGH);
digitalWrite(g, HIGH);
}
/*******************************************/
void add()
{
// Toggle LED
count ++;
if (count == 10)
{
count = 0;
n++;
if (n == 59)
{
n = 0;
}
}
}