Arduino Calculator Using 4x4 Keypad
อุปกรณ์
- Arduino Uno (Any version will work)
- 16×2 LCD Display
- 4×4 Keypad
- 9V Battery
- Breadboard and Connecting wires
Diagram
Code
/*
* Arduino Keypad calculator Program
*/
#include<LiquidCrystal.h>//ประกาศเมื่อจะใช้จอLCD
#include <Keypad.h> //ประกาศเมื่อมีกรใช้ Keypad
const byte ROWS = 4; // ให้มี 4 แถว
const byte COLS = 4; // ให้มี 4 คอลัมม์
// กำหนดรูปแบบ Keypad
char keys[ROWS][COLS] = {
{'7','8','9','D'},
{'4','5','6','C'},
{'1','2','3','B'},
{'*','0','#','A'}
};
byte rowPins[ROWS] = { 0, 1, 2, 3 };// ต่อ Keypad ROW0, ROW1, ROW2 และ ROW3 ที่บอร์ด
byte colPins[COLS] = { 4, 5, 6, 7 }; // ต่อ Keypad COL0, COL1 และ COL2 ที่บอร์ด.
Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS ); //สร้างkeypad
const int rs = 8, en = 9, d4 = 10, d5 = 11, d6 = 12, d7 = 13; //ขาแต่ละขาที่ต่อLCD
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
long Num1,Num2,Number;
char key,action;
boolean result = false;
void setup() {
lcd.begin(16, 2); //กำหนดจอ 16*2
lcd.print("DIY Calculator"); //แสดงขอ้ความ
lcd.setCursor(0, 1); // เซ็ตตำแหน่งที่ 0,1
lcd.print("-CircuitDigest"); //แสดงข้อความ
delay(2000);
lcd.clear(); //ล้างหน้าจอ
}
void loop() {
key = kpd.getKey(); //storing pressed key value in a char
if (key!=NO_KEY)
DetectButtons();
if (result==true)
CalculateResult();
DisplayResult();
}
void DetectButtons()
{
lcd.clear(); //ล้างหน้าจอ
if (key=='*') //Iถ้ากดปุ่ม cancel Button
{Serial.println ("Button Cancel"); Number=Num1=Num2=0; result=false;}
if (key == '1') //ถ้ากด Button 1
{Serial.println ("Button 1");
if (Number==0)
Number=1;
else
Number = (Number*10) + 1; //ถ้ากด 2 ครั้ง
}
if (key == '4') //If Button 4 is pressed
{Serial.println ("Button 4");
if (Number==0)
Number=4;
else
Number = (Number*10) + 4; //Pressed twice
}
if (key == '7') //If Button 7 is pressed
{Serial.println ("Button 7");
if (Number==0)
Number=7;
else
Number = (Number*10) + 7; //Pressed twice
}
if (key == '0')
{Serial.println ("Button 0"); //Button 0 is Pressed
if (Number==0)
Number=0;
else
Number = (Number*10) + 0; //Pressed twice
}
if (key == '2') //Button 2 is Pressed
{Serial.println ("Button 2");
if (Number==0)
Number=2;
else
Number = (Number*10) + 2; //Pressed twice
}
if (key == '5')
{Serial.println ("Button 5");
if (Number==0)
Number=5;
else
Number = (Number*10) + 5; //Pressed twice
}
if (key == '8')
{Serial.println ("Button 8");
if (Number==0)
Number=8;
else
Number = (Number*10) + 8; //Pressed twice
}
if (key == '#')
{Serial.println ("Button Equal");
Num2=Number;
result = true;
}
if (key == '3')
{Serial.println ("Button 3");
if (Number==0)
Number=3;
else
Number = (Number*10) + 3; //Pressed twice
}
if (key == '6')
{Serial.println ("Button 6");
if (Number==0)
Number=6;
else
Number = (Number*10) + 6; //Pressed twice
}
if (key == '9')
{Serial.println ("Button 9");
if (Number==0)
Number=9;
else
Number = (Number*10) + 9; //Pressed twice
}
if (key == 'A' || key == 'B' || key == 'C' || key == 'D') //ถ้าพบการกกดปุ่มของคอลัมม์ที่ 4
{
Num1 = Number;
Number =0;
if (key == 'A')
{Serial.println ("Addition"); action = '+';}
if (key == 'B')
{Serial.println ("Subtraction"); action = '-'; }
if (key == 'C')
{Serial.println ("Multiplication"); action = '*';}
if (key == 'D')
{Serial.println ("Devesion"); action = '/';}
delay(100);
}
}
void CalculateResult() //classของการคำนวณทางคณิตศาสตร์
{
if (action=='+')
Number = Num1+Num2;
if (action=='-')
Number = Num1-Num2;
if (action=='*')
Number = Num1*Num2;
if (action=='/')
Number = Num1/Num2;
}
void DisplayResult()
{
lcd.setCursor(0, 0); // set the cursor to column 0, line 1
lcd.print(Num1); lcd.print(action); lcd.print(Num2);
if (result==true)
{lcd.print(" ="); lcd.print(Number);} //Display the result
lcd.setCursor(0, 1); // set the cursor to column 0, line 1
lcd.print(Number); //Display the result
}
Credit By : https://circuitdigest.com/microcontroller-projects/arduino-calculator-using-4x4-keypad
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