Question

Q1) Modify the following code to sequentially display 154628577990449700

/* DisplayDigitsUsingIndexedArray - Sequentially displays digits 0 - 9 using an indexed array and register I/O Written by Duncan McGehee 1 October 2011 */ /*PORTD.7 is connected to the A-segment of the 7-segment display PORTD.6 = B, PORTD.5 = C, PORTD.4 = D, PORTD.3 = E PORTD.2 = F, PORTD.1 = G */ /* Declare an array of binary numbers that will be used to drive the 7-segment display. This is done once, globally, so that we don't redeclare it each time the program loops */ byte DisplayNumbers[] = {B11111100, B01100000, B11011010, B11110010,                         B01100110, B10110110, B10111110, B11100000,                         B11111110, B11110110}; void setup() { DDRD = B11111110; /* DDRD is the direction register for the Arduino's PORT D (Digital Pins 0 - 7). DDRD = B11111110 tells Arduino to set pin 0 for input, pins 1 through 7 for output */ } void loop() //This function loops forever {     //Send each digit to the 7-segment display for .5 second for (byte index = 0; index <= 9; index++) {     PORTD = DisplayNumbers[index]; //Use the indexed array to choose the digit     delay(500); } //turn off the 7-segment display for half a second PORTD = B00000000; delay(500); }

Answer 1

Please up vote ,comment if any query . Thanks for question . Be safe .

Note : check attached image for simulation output ,code compiled in ARDUINO IDE and simulation tested in Proteus VSM .

Program Plan :

1. Create array of size 18 with sequential output .
2. display one by one each digit on segment with delay of 500milli second .

Program :

/* DisplayDigitsUsingIndexedArray - Sequentially displays

digits 0 - 9 using an indexed array and register I/O

Written by Duncan McGehee

1 October 2011 */

/*PORTD.7 is connected to the A-segment of the 7-segment display

PORTD.6 = B, PORTD.5 = C, PORTD.4 = D, PORTD.3 = E

PORTD.2 = F, PORTD.1 = G */

/* Declare an array of binary numbers that will be used to drive

the 7-segment display. This is done once, globally, so that we

don't redeclare it each time the program loops */
/*
byte DisplayNumbers[] = {B11111100, B01100000, B11011010, B11110010,

                        B01100110, B10110110, B10111110, B11100000,

                        B11111110, B11110110};*/
//Create new array of DisplayNumbers with value of size 18
//1,5,4,6,2,8,5,7,7,9,9,0,4,4,9,7,0,0
byte DisplayNumbers[]={B01100000,B10110110,B01100110,B10111110,B11011010,B11111110,B10110110,B11100000,B11100000, B11110110, B11110110,B11111100,
                       B01100110,B01100110,B11110110, B11100000,B11111100,B11111100
                      };
void setup()

{

DDRD = B11111110; /* DDRD is the direction register for

the Arduino's PORT D (Digital Pins 0 - 7). DDRD = B11111110

tells Arduino to set pin 0 for input, pins 1 through 7 for output */

}

void loop() //This function loops forever

{

    //Send each digit to the 7-segment display for .5 second
//display element from array index 0 to 17
for (byte index = 0; index < 18; index++)

{

    PORTD = DisplayNumbers[index]; //Use the indexed array to choose the digit

    delay(500);

}

//turn off the 7-segment display for half a second

PORTD = B00000000;

delay(500);

}

Simulation Output :

Please comment if you want any changes .