The program is for an arduino kit

1. Add the letters A, b, c, d, E, F to your homework program. Continually display 0123, 4567, 89Ab, cdEF with a one second delay between each one.

HINT: Expand pickNumber() to use numbers 10-15 (a-f in hex). Create new functions for a-f.

THIS IS THE CODE THAT I HAD FOR MY HOMEWORK

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#include //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 = 9;

int d4 = 10; int d3 = 11; int d2 = 12; int d1 = 13;

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);

Timer1.initialize(100000); // set a timer of length 100000 microseconds (or 0.1 sec - or 10Hz => the led will blink 5 times, 5 cycles of on-and-off, per second) Timer1.attachInterrupt( add ); // attach the service routine here } /***************************************/ 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(d1, HIGH); digitalWrite(d2, HIGH); digitalWrite(d3, HIGH); digitalWrite(d4, HIGH);

switch(x) { case 0: digitalWrite(d1, LOW);//Light d1 up break; case 1: digitalWrite(d2, LOW); //Light d2 up break; case 2: digitalWrite(d3, LOW); //Light d3 up break; default: digitalWrite(d4, 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 == 10000) { n = 0; } } }

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