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6 | 7 | const byte KEYPAD_ROWS = 4; 8 | const byte KEYPAD_COLS = 4; 9 | byte rowPins[KEYPAD_ROWS] = {5, 4, 3, 2}; 10 | byte colPins[KEYPAD_COLS] = {A3, A2, A1, A0}; 11 | char keys[KEYPAD_ROWS][KEYPAD_COLS] = { 12 | {'1', '2', '3', '+'}, 13 | {'4', '5', '6', '-'}, 14 | {'7', '8', '9', '*'}, 15 | {'.', '0', '=', '/'} 16 | }; 17 | 18 | Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, KEYPAD_ROWS, KEYPAD_COLS); 19 | 20 | uint64_t value = 0; 21 | 22 | void showSpalshScreen() { 23 | lcd.print("Abhineet Raj"); 24 | lcd.setCursor(0, 1); 25 | String message = "Arduino project"; 26 | for (byte i = 0; i < message.length(); i++) { 27 | lcd.print(message[i]); 28 | delay(50); 29 | } 30 | delay(500); 31 | } 32 | 33 | void updateCursor() { 34 | if (millis() / 250 % 2 == 0 ) { 35 | lcd.cursor(); 36 | } else { 37 | lcd.noCursor(); 38 | } 39 | } 40 | 41 | void setup() { 42 | Serial.begin(115200); 43 | lcd.begin(16, 2); 44 | 45 | showSpalshScreen(); 46 | lcd.clear(); 47 | lcd.cursor(); 48 | 49 | lcd.setCursor(1, 0); 50 | } 51 | 52 | char operation = 0; 53 | String memory = ""; 54 | String current = ""; 55 | uint64_t currentDecimal; 56 | bool decimalPoint = false; 57 | 58 | double calculate(char operation, double left, double right) { 59 | switch (operation) { 60 | case '+': return left + right; 61 | case '-': return left - right; 62 | case '*': return left * right; 63 | case '/': return left / right; 64 | } 65 | } 66 | 67 | void processInput(char key) { 68 | if ('-' == key && current == "") { 69 | current = "-"; 70 | lcd.print("-"); 71 | return; 72 | } 73 | 74 | switch (key) { 75 | case '+': 76 | case '-': 77 | case '*': 78 | case '/': 79 | if (!operation) { 80 | memory = current; 81 | current = ""; 82 | } 83 | operation = key; 84 | lcd.setCursor(0, 1); 85 | lcd.print(key); 86 | lcd.setCursor(current.length() + 1, 1); 87 | return; 88 | 89 | case '=': 90 | float leftNum = memory.toDouble(); 91 | float rightNum = current.toDouble(); 92 | memory = String(calculate(operation, leftNum, rightNum)); 93 | current = ""; 94 | lcd.clear(); 95 | lcd.setCursor(1, 0); 96 | lcd.print(memory); 97 | lcd.setCursor(0, 1); 98 | lcd.print(operation); 99 | return; 100 | 101 | } 102 | 103 | if ('.' == key && current.indexOf('.') >= 0) { 104 | return; 105 | } 106 | 107 | if ('.' != key && current == "0") { 108 | current = String(key); 109 | } else if (key) { 110 | current += String(key); 111 | } 112 | 113 | lcd.print(key); 114 | } 115 | 116 | void loop() { 117 | updateCursor(); 118 | 119 | char key = keypad.getKey(); 120 | if (key) { 121 | processInput(key); 122 | } 123 | } --------------------------------------------------------------------------------