#include <LiquidCrystal.
h>
#include <Keypad.h>
#include <DFRobot_RGBLCD1602.h>
LiquidCrystal lcd(14, 15, 16, 17, 18, 19);
DFRobot_RGBLCD1602 lcd2(16, 2); // Initializes the second LCD with I2C
const byte ROWS = 4;
const byte COLS = 3;
char keys[ROWS][COLS] = {
{'1', '2', '3'},
{'4', '5', '6'},
{'7', '8', '9'},
{'*', '0', '#'}
};
byte rowPins[ROWS] = {2, 3, 4, 5};
byte colPins[COLS] = {6, 7, 8};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
int num1 = 0;
int num2 = 0;
bool isNum1 = true;
int col = 0;
// Define pin connections
const int carryInFirst = 12;
const int carryInSecond = 11;
const int carryOutPinSecond = 10;
const int sumPinsLower[4] = {38, 40, 42, 44};
const int sumPinsUpper[4] = {45, 43, 41, 39};
const int aPinsLower[4] = {22, 24, 26, 28};
const int aPinsUpper[4] = {46, 48, 50, 52};
const int bPinsLower[4] = {30, 32, 34, 36};
const int bPinsUpper[4] = {53, 51, 49, 47};
void setup() {
for (int i = 0; i < 4; i++) {
pinMode(sumPinsLower[i], INPUT);
pinMode(sumPinsUpper[i], INPUT);
}
pinMode(carryOutPinSecond, INPUT);
lcd.begin(16, 2);
lcd2.init();
lcd2.setRGB(255, 0, 0); // Set RGB backlight color for second LCD
lcd.print("Enter values:");
lcd2.print("Enter values:"); // Show initial message on both LCDs
delay(2000);
lcd.clear();
lcd2.clear();
}
void loop() {
char key = keypad.getKey();
if (key) {
if (key == '#') {
int sum = readResultFrom7483s();
bool carryOut = digitalRead(carryOutPinSecond);
lcd.clear();
lcd2.clear();
lcd.setCursor(0, 0);
lcd2.setCursor(0, 0);
lcd.print("Sum: ");
lcd2.print("Sum: ");
lcd.print(sum);
lcd2.print(sum);
lcd.setCursor(0, 1);
lcd2.setCursor(0, 1);
lcd.print("Carry Out: ");
lcd2.print("Carry Out: ");
lcd.print(carryOut);
lcd2.print(carryOut);
delay(5000);
num1 = 0;
num2 = 0;
isNum1 = true;
col = 0;
lcd.clear();
lcd2.clear();
lcd.print("Enter values:");
lcd2.print("Enter values:");
delay(2000);
lcd.clear();
lcd2.clear();
} else if (key == '*') {
isNum1 = false;
col = 0;
lcd.setCursor(col, 1);
lcd2.setCursor(col, 1);
} else {
if (isNum1) {
num1 = num1 * 10 + (key - '0');
lcd.setCursor(col, 0);
lcd2.setCursor(col, 0);
} else {
num2 = num2 * 10 + (key - '0');
lcd.setCursor(col, 1);
lcd2.setCursor(col, 1);
}
lcd.print(key);
lcd2.print(key);
col++;
}
}
delay(100);
}
void setInputsTo7483s(int a, int b) {
for (int i = 0; i < 4; i++) {
pinMode(aPinsLower[i], OUTPUT);
pinMode(bPinsLower[i], OUTPUT);
digitalWrite(aPinsLower[i], (a >> i) & 1);
digitalWrite(bPinsLower[i], (b >> i) & 1);
}
for (int i = 0; i < 4; i++) {
pinMode(aPinsUpper[i], OUTPUT);
pinMode(bPinsUpper[i], OUTPUT);
digitalWrite(aPinsUpper[i], (a >> (i + 4)) & 1);
digitalWrite(bPinsUpper[i], (b >> (i + 4)) & 1);
}
}
int readResultFrom7483s() {
setInputsTo7483s(num1, num2);
int sumLower = 0;
for (int i = 0; i < 4; i++) {
sumLower |= (digitalRead(sumPinsLower[i]) << i);
}
int sumUpper = 0;
for (int i = 0; i < 4; i++) {
sumUpper |= (digitalRead(sumPinsUpper[i]) << i);
}
return (sumUpper << 4) | sumLower;
}
