Simple Expense Splitter.md

README.md

@@ -1,6 +1,82 @@
-# LiquidCrystal_I2C
+#include <Wire.h>
+#include <LiquidCrystal_I2C.h>
+#include <Keypad.h>
 
-LiquidCrystal Arduino library for I2C LCD displays
+// Initialize LCD at address 0x27
+LiquidCrystal_I2C lcd(0x27, 16, 2);
 
-**Status: Archived** 
-This repository has been transfered to GitLab at https://gitlab.com/tandembyte/LCD_I2C
+// Keypad setup
+const byte ROWS = 4;
+const byte COLS = 4;
+char keys[ROWS][COLS] = {
+  {'1','2','3','A'},
+  {'4','5','6','B'},
+  {'7','8','9','C'},
+  {'*','0','#','D'}
+};
+byte rowPins[ROWS] = {2, 3, 4, 5};
+byte colPins[COLS] = {6, 7, 8, 9};
+Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
+
+// Variables
+String totalAmount = "";
+String numPeople = "";
+float share = 0.0;
+int step = 0;
+
+void setup() {
+  lcd.init();
+  lcd.backlight();
+  lcd.setCursor(0, 0);
+  lcd.print("Expense Splitter");
+  delay(2000);
+  lcd.clear();
+  lcd.print("Total Amount:");
+}
+
+void loop() {
+  char key = keypad.getKey();
+  if (key) {
+    if (key == '#') {
+      if (step == 0 && totalAmount != "") {
+        step = 1;
+        lcd.clear();
+        lcd.print("People Count:");
+      } else if (step == 1 && numPeople != "") {
+        float total = totalAmount.toFloat();
+        int people = numPeople.toInt();
+        if (people == 0) {
+          lcd.clear();
+          lcd.print("Can't divide by 0");
+          delay(2000);
+          lcd.clear();
+          numPeople = "";
+          lcd.print("People Count:");
+          return;
+        }
+        share = total / people;
+        lcd.clear();
+        lcd.print("Each pays:");
+        lcd.setCursor(0, 1);
+        lcd.print(share, 2);
+      }
+    } else if (key == '*') {
+      // Reset everything
+      totalAmount = "";
+      numPeople = "";
+      step = 0;
+      lcd.clear();
+      lcd.print("Total Amount:");
+    } else {
+      if (step == 0) {
+        totalAmount += key;
+        lcd.setCursor(0, 1);
+        lcd.print(totalAmount);
+      } else if (step == 1) {
+        numPeople += key;
+        lcd.setCursor(0, 1);
+        lcd.print(numPeople);
+      }
+    }
+  }
+}