Algorithm and Program to Turn on Diagonal LEDs of 2*2*2 LED Cube (Part 11 of 13)

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          Previous portion of this topic is given in the last page. Algorithm and arduino program for the working of 2*2*2 LED cube by persistence of vision can be demonstrated as shown below.

          Turn on LED 5 first. Then turn off LED 5 and turn on LED 3 within 1/16^th part of that second at which LED 5 was turned on. Then, turn off LED 3 and turn on LED 5 again within 1/16^th part of that second at which LED 3 was turned on. This will give an illusion to our eyes that LED 5 and LED 3 are ON because of persistence of vision. Following program will implement this algorithm to turn on LED 3 and LED 5 together.

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int f = 8;  //Connect "f" terminal of LED Cube to 8th pin of arduino
int e = 9;  //Connect "e" terminal of LED Cube to 9th pin of arduino
int d = 10; //Connect "d" terminal of LED Cube to 10th pin of arduino
int c = 11; //Connect "c" terminal of LED Cube to 11th pin of arduino
int b = 12; //Connect "b" terminal of LED Cube to 12th pin of arduino
int a = 13; //Connect "a" terminal of LED Cube to 13th pin of arduino

int i=0;

// the setup routine runs once when you press reset:
void setup() {                
  // initialize the digital pin as an output.
  pinMode(f, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(a, OUTPUT);   
}

// the loop routine runs over and over again forever:
void loop() {

  //Turn on LED 3  
  for(i=0;i<25;i++)
  {
    digitalWrite(f, HIGH);   
    digitalWrite(e, LOW);   
    digitalWrite(d, LOW); 
    digitalWrite(c, HIGH);
    digitalWrite(b, HIGH);  
    digitalWrite(a, HIGH);  
  }

  //Turn off LED 7
  digitalWrite(f, LOW);   
  digitalWrite(e, LOW);  

  //Turn on LED 5  
  for(i=0;i<25;i++)
  {
    digitalWrite(f, LOW);    
    digitalWrite(e, HIGH);  
    digitalWrite(d, HIGH);  
    digitalWrite(c, HIGH);   
    digitalWrite(b, HIGH);  
    digitalWrite(a, LOW);     
  }
 
  //Turn off LED 5
  digitalWrite(f, LOW);  
  digitalWrite(e, LOW);   
  
}

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          If uploading is successful, LED 3 and LED 5 will turn on. In the program, there is an "i" loop. This loop is for keeping the LEDs in the ON state for a few milliseconds. By changing the upper limit of "i" loop, we can adjust the brightness of LEDs.

Continued in Next Part (Part 12)  >>>>