7 segment led read data from serial

7_segment_led_read_serial.c

int segA = 3; // top
int segB = 4; // right-top
int segC = 5; // right-bottom
int segD = 6; // bottom
int segE = 7; // left-bottom
int segF = 8; // left-top
int segG = 9; // middle
int dp = 10;
 
int digit1 = 14; // common cathode for digit1 (i.e. A0)
int digit2 = 15; // common cathode for digit2 (i.e. A1)
int digit3 = 16; // common cathode for digit3 (i.e. A2)
int digit4 = 17; // common cathode for digit4 (i.e. A3)

 
// Number to display
static int number = 0;
static int ms = 0;
String inData; 
int collectedNumber;

int   blinkRate=0;  
 
//==============================================================//
void setup()
{
    Serial.begin(9600);

    // All pins in digital mode
    pinMode(digit1, OUTPUT);
    pinMode(digit2, OUTPUT);
    pinMode(digit3, OUTPUT);
    pinMode(digit4, OUTPUT);
 
    pinMode(segA, OUTPUT);
    pinMode(segB, OUTPUT);
    pinMode(segC, OUTPUT);
    pinMode(segD, OUTPUT);
    pinMode(segE, OUTPUT);
    pinMode(segF, OUTPUT);
    pinMode(segG, OUTPUT);
    pinMode(dp, OUTPUT);

}
 
//==============================================================//
void loop() {
digitalWrite(dp, HIGH);

   
    if(Serial.available()){
      
      char ch = Serial.read();
      inData += ch;
    
      Serial.println(inData);
      number =  inData.toInt();

    }else{
      
      inData = "";
      
    }

    
    digitalWrite(digit1, LOW);
        // light on segments for 'thousands'
        drawDigitFast( (number/1000) % 10 );
        // wait 2 ms
        delay(2);
        // turn off all segments
        drawDigitFast( -1 );
    // turn off cathode for digit1
    digitalWrite(digit1, HIGH);

 
    digitalWrite(digit2, LOW);
        drawDigitFast( (number/100) % 10 );
        delay(2);
        drawDigitFast( -1 );
    digitalWrite(digit2, HIGH);

 
    digitalWrite(digit3, LOW);
        drawDigitFast( (number/10) % 10 );
        delay(2);
        drawDigitFast( -1 );
    digitalWrite(digit3, HIGH);

 
    digitalWrite(digit4, LOW);
        drawDigitFast( number % 10 );
        delay(2);
        drawDigitFast( -1 );
    digitalWrite(digit4, HIGH);
    
}
 
//-----------------------------------------------------//
void drawDigitFast(int n)
{
    const byte aPins[8] = {
        segA, segB, segC, segD, segE, segF, segG
    };
    const byte aSegments[11][8] = {
        //  A     B     C     D     E     F     G
        { HIGH, HIGH, HIGH, HIGH, HIGH, HIGH,  LOW }, // 0
        {  LOW, HIGH, HIGH,  LOW,  LOW,  LOW,  LOW }, // 1
        { HIGH, HIGH,  LOW, HIGH, HIGH,  LOW, HIGH }, // 2
        { HIGH, HIGH, HIGH, HIGH,  LOW,  LOW, HIGH }, // 3
        {  LOW, HIGH, HIGH,  LOW,  LOW, HIGH, HIGH }, // 4
        { HIGH,  LOW, HIGH, HIGH,  LOW, HIGH, HIGH }, // 5
        { HIGH,  LOW, HIGH, HIGH, HIGH, HIGH, HIGH }, // 6
        { HIGH, HIGH, HIGH,  LOW,  LOW,  LOW, LOW  }, // 7
        { HIGH, HIGH, HIGH, HIGH, HIGH, HIGH, HIGH }, // 8
        { HIGH, HIGH, HIGH, HIGH,  LOW, HIGH, HIGH }, // 9
        {  LOW,  LOW,  LOW,  LOW,  LOW,  LOW,  LOW }  // all off
    };
 
    if( n < 0 || n > 10 )
    {
        n = 10;
    }
 
    for( int i = 0; i < 7; i++ )
    {
        digitalWrite( aPins[i], aSegments[n][i] );
    }
}