Rangkaian Keypad 4x4 dengan Proteus serta Codevision AVR

Berikut ini contoh Program Kalkulator untuk Operasi aritmetik sederhana antara operand1 dan operand 2 hasil = operand1  operator  operand2 Operator yg digunakan :  X(kali), / (bagi), + (tambah), dan  – (kurang) Contoh  operasi aritmatik :   hasil = 34 X 2 keterangan: 34 adalah operand1 X adalah operator 2 adalah operand2 Rangkaian Simulasi dengan Proteus Flowchart Program Ringkasan Program

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/***************************************************** CodeWizardAVR V1.24.8d Professional Chip type : ATmega16 *****************************************************/ #include <mega16.h> #include <delay.h> #include <lcd.h> #include <stdlib.h> #include <math.h> #define scanKeypad 1 #define stopScan 0 // Alphanumeric LCD Module functions #asm .equ __lcd_port=0x15 ;PORTC #endasm #include <lcd.h> int bacaKeyPad(void); float kalkulator(void); int operand1 = 0 , operand2 = 0 ; float hasil = 0 ; char kode=0 , bufferLCD[50] ; void main(void) { PORTA=0x00; DDRA=0x0F; PORTC=0x00; DDRC=0x00; lcd_init(20); while (1) { kalkulator(); }; } //================== int bacaKeyPad(void){ char StatusBaca = scanKeypad ; while(StatusBaca==scanKeypad){ PORTA.0 = 1 ; PORTA.1 = 0 ; PORTA.2 = 0 ; PORTA.3 = 0 ; if(PINA.4 == 1){return 7 ; StatusBaca = stopScan;} if(PINA.5 == 1){return 8 ; StatusBaca = stopScan;} if(PINA.6 == 1){return 9 ; StatusBaca = stopScan;} if(PINA.7 == 1){return 10; StatusBaca = stopScan;} //========================================== PORTA.0 = 0 ; PORTA.1 = 1 ; PORTA.2 = 0 ; PORTA.3 = 0 ; if(PINA.4 == 1){return 4 ; StatusBaca = stopScan;} if(PINA.5 == 1){return 5 ; StatusBaca = stopScan;} if(PINA.6 == 1){return 6 ; StatusBaca = stopScan;} if(PINA.7 == 1){return 11; StatusBaca = stopScan;} //========================================== PORTA.0 = 0 ; PORTA.1 = 0 ; PORTA.2 = 1 ; PORTA.3 = 0 ; if(PINA.4 == 1){return 1 ; StatusBaca = stopScan;} if(PINA.5 == 1){return 2 ; StatusBaca = stopScan;} if(PINA.6 == 1){return 3 ; StatusBaca = stopScan;} if(PINA.7 == 1){return 12; StatusBaca = stopScan;} //========================================== PORTA.0 = 0 ; PORTA.1 = 0 ; PORTA.2 = 0 ; PORTA.3 = 1 ; if(PINA.4 == 1){return 15; StatusBaca = stopScan;} if(PINA.5 == 1){return 0 ; StatusBaca = stopScan;} if(PINA.6 == 1){return 14; StatusBaca = stopScan;} if(PINA.7 == 1){return 13; StatusBaca = stopScan;} StatusBaca = scanKeypad ; } } //========================== float kalkulator(void) { int StatusBaca = scanKeypad ; kode = bacaKeyPad(); if( kode < 10 ) // kalau angka 0-9 ditekan { operand1 = (operand1*10)+ kode ; itoa(kode , bufferLCD);                    // rubah kode ke ASCII lcd_puts(bufferLCD);                      //tampilkan kode  operand1 yg ditekan delay_ms(50); } //========================== if( kode > 9 && kode < 16 ) // jika ditekan 10,11,12,13,14,15 (X, -, +, atau /) { if(kode == 10)lcd_putchar('/') ; if(kode == 11)lcd_putchar('X') ; if(kode == 12)lcd_putchar('-') ; if(kode == 13)lcd_putchar('+') ; operator = kode;                      // simpan operator yg dipilih { kode = bacaKeyPad(); if( kode < 10 ) { operand2 = (operand2*10)+kode ; itoa(kode , bufferLCD);                    // rubah kode ke  ASCII lcd_puts(bufferLCD);                        //tampilkan kode  operand2 yg ditekan delay_ms(50); } else if(kode == 14) //jika ditekan "=" laksanakan operasi { lcd_putchar('='); if(operator == 10){ // jika ditekan '/' hasil = operand1 / operand2 ; } if(operator == 11){ // jika ditekan 'X' hasil = operand1 * operand2 ; } if(operator == 12){ // jika ditekan '-' hasil = operand1 - operand2 ; } if(operator == 13){ // jika ditekan '+' hasil = operand1 + operand2 ; } ftoa(hasil , 1 , bufferLCD);                // rubah hasil ke string ( string adalah array berisi ascii diakhiri NULL ) lcd_puts(bufferLCD);                         // print hasil ke LCD delay_ms(100); kode = 0 ; StatusBaca = stopScan ; } } } //============================== return 0; }

Perbaikan kesalahan tampilan kode  pada tulisan diatas 

Untuk alternatif lain coba kode untuk keypad 4×4 berikut ini

#define delaykeypad 200

int kode=0xff ,data;
int key(void)
{

PORTA.4=0;
delay_ms(3);
if (PINA.0==0) {kode=13;delay_ms(delaykeypad);}
else if (PINA.1==0){kode=15;delay_ms(delaykeypad);}
else if (PINA.2==0){kode=0;delay_ms(delaykeypad);}
else if (PINA.3==0){kode=14;delay_ms(delaykeypad);}

PORTA.4=1;
PORTA.5=0;
delay_ms(3);
if (PINA.0==0) {kode=12;delay_ms(delaykeypad);}
else if (PINA.1==0){kode=9;delay_ms(delaykeypad);}
else if (PINA.2==0){kode=8;delay_ms(delaykeypad);}
else if (PINA.3==0){kode=7;delay_ms(delaykeypad);}

PORTA.5=1; PORTA.6=0;
delay_ms(3);
if (PINA.0==0) {kode=11;delay_ms(delaykeypad);}
else if (PINA.1==0){kode=6;delay_ms(delaykeypad);}
else if (PINA.2==0){kode=5;delay_ms(delaykeypad);}
else if (PINA.3==0){kode=4;delay_ms(delaykeypad);}

PORTA.6=1; PORTA.7=0;
delay_ms(3);
if (PINA.0==0) {kode=10;delay_ms(delaykeypad);}
else if (PINA.1==0){kode=3;delay_ms(delaykeypad);}
else if (PINA.2==0){kode=2;delay_ms(delaykeypad);}
else if (PINA.3==0){kode=1;delay_ms(delaykeypad);}

PORTA.7=1;
delay_ms(3);

if(kode !=0xff)
{
data = kode;
kode =0xff;
return data;
}

}