Three digit LED control for Arduino Arduino sketch to control a 3 digit LED display (TOT-5361BE-D).

connections.txt

Connect the Arduino UNO pins "(x)" to the LED leads "-" as follows:

     _________
     |       |
 (1)-| ***** |-(11)
     | * * * |
 (2)-| ***** |-(10)
     |       |
 (3)-| ***** |-(9)
     | * * * |
 (4)-| ***** |-(8)
     |       |
 (5)-| ***** |-(7)
     | * * * |
     | ***** |-(6)
     |_______|

View picture of working example at https://www.dropbox.com/sc/8b7aebeq2je8s09/i--Iy9BwY4

three_digit_led.ino

int segA = 10;
int segB = 6;
int segC = 4;
int segD = 2;
int segE = 1;
int segF = 9;
int segG = 5;
int pnt   = 3;

int dig1 = 7;
int dig2 = 8;
int dig3 = 11;

void setup()   {                
  for(int i=1; i<12; i++){
    pinMode(i,OUTPUT);
  }
}

void loop() {
    DisplayNumber(123);
}

void DisplayNumber(int num) {
  for(int digit = 3; digit > 0; digit--) {
    SetDigit(digit);
    DisplayDigit(num % 10);
    num /= 10;
    delayMicroseconds(500);
    DisplayDigit(10);
    SetDigit(0);
    delayMicroseconds(20);
  }
}

void SetDigit(int d) {
 
 switch(d) {
   
    case 0:
      digitalWrite(dig1,LOW);
      digitalWrite(dig2,LOW);
      digitalWrite(dig3,LOW);  
      break;    
 
    case 1:
      digitalWrite(dig1,LOW);
      digitalWrite(dig2,LOW);
      digitalWrite(dig3,HIGH);  
      break;
     
    case 2:
      digitalWrite(dig1,LOW);
      digitalWrite(dig2,HIGH);
      digitalWrite(dig3,LOW);  
      break;
     
    case 3:
      digitalWrite(dig1,HIGH);
      digitalWrite(dig2,LOW);
      digitalWrite(dig3,LOW);  
      break; 
 }
  
}

void DisplayDigit(int n) {
  
  switch(n) {
    
    case 1:
      digitalWrite(segA,HIGH);
      digitalWrite(segB,LOW);
      digitalWrite(segC,LOW);
      digitalWrite(segD,HIGH);
      digitalWrite(segE,HIGH);
      digitalWrite(segF,HIGH);
      digitalWrite(segG,HIGH);
      break;

    case 2:
      digitalWrite(segA,LOW);
      digitalWrite(segB,LOW);
      digitalWrite(segC,HIGH);
      digitalWrite(segD,LOW);
      digitalWrite(segE,LOW);
      digitalWrite(segF,HIGH);
      digitalWrite(segG,LOW);
      break;

    case 3:
      digitalWrite(segA,LOW);
      digitalWrite(segB,LOW);
      digitalWrite(segC,LOW);
      digitalWrite(segD,LOW);
      digitalWrite(segE,HIGH);
      digitalWrite(segF,HIGH);
      digitalWrite(segG,LOW);
      break;

    case 4:
      digitalWrite(segA,HIGH);
      digitalWrite(segB,LOW);
      digitalWrite(segC,LOW);
      digitalWrite(segD,HIGH);
      digitalWrite(segE,HIGH);
      digitalWrite(segF,LOW);
      digitalWrite(segG,LOW);
      break;

    case 5:
      digitalWrite(segA,LOW);
      digitalWrite(segB,HIGH);
      digitalWrite(segC,LOW);
      digitalWrite(segD,LOW);
      digitalWrite(segE,HIGH);
      digitalWrite(segF,LOW);
      digitalWrite(segG,LOW);
      break;

    case 6:
      digitalWrite(segA,LOW);
      digitalWrite(segB,HIGH);
      digitalWrite(segC,LOW);
      digitalWrite(segD,LOW);
      digitalWrite(segE,LOW);
      digitalWrite(segF,LOW);
      digitalWrite(segG,LOW);
      break;

    case 7:
      digitalWrite(segA,LOW);
      digitalWrite(segB,LOW);
      digitalWrite(segC,LOW);
      digitalWrite(segD,HIGH);
      digitalWrite(segE,HIGH);
      digitalWrite(segF,HIGH);
      digitalWrite(segG,HIGH);
      break;

    case 8:
      digitalWrite(segA,LOW);
      digitalWrite(segB,LOW);
      digitalWrite(segC,LOW);
      digitalWrite(segD,LOW);
      digitalWrite(segE,LOW);
      digitalWrite(segF,LOW);
      digitalWrite(segG,LOW);
      break;

    case 9:
      digitalWrite(segA,LOW);
      digitalWrite(segB,LOW);
      digitalWrite(segC,LOW);
      digitalWrite(segD,LOW);
      digitalWrite(segE,HIGH);
      digitalWrite(segF,LOW);
      digitalWrite(segG,LOW);
      break;

    case 0:
      digitalWrite(segA,LOW);
      digitalWrite(segB,LOW);
      digitalWrite(segC,LOW);
      digitalWrite(segD,LOW);
      digitalWrite(segE,LOW);
      digitalWrite(segF,LOW);
      digitalWrite(segG,HIGH);
      break;

    case 10:
      digitalWrite(segA,HIGH);
      digitalWrite(segB,HIGH);
      digitalWrite(segC,HIGH);
      digitalWrite(segD,HIGH);
      digitalWrite(segE,HIGH);
      digitalWrite(segF,HIGH);
      digitalWrite(segG,HIGH);
      break;      
  }
  digitalWrite(pnt,HIGH);
}