Koneksi Keypad dengan ATMega16 Microkontroller

Hi, hari ini kita akan belajar bagaimana Anda menghubungkan tombol dengan ATMega16 Mikrokontroler. Seperti yang kita semua tahu, ini hanya sebuah proyek sederhana yang tenang. biarkan aku tahu bahwa u've telah mempersiapkan ini tol sebelum.
AVR Modul
* LED and switch
* RS 232 / cross
* KEYPAD 3 x 4
Sebelum kita mulai saya sangat berharap bahwa Anda sudah tahu dengan baik tentang tombol,spesifikasi dari tombol yaitu :General Specification
• Contact rating:20mA,24VDC
• Contact resistance:200 ohm max
• Life:1,000,000 cycles per key
• Operating Temperature: -20 to +60
• Storage Temperature: -40 to +65
Circuit & Configuration

Kini Anda telah ahli tentang ini tahu,! Okey, itu saja tentang tombol. Sekarang kita akan menghubungkan tombol ini kami Mikro AVR PIN. di sini adalah Diagram Sambungan.

If ROW 1 has a logic value 0 and other ROW given logic 1, then: PORTC=0xFD (1111 1101)
If pressed button 1, (ROW1 COL 1) then PINC= 0xF9(1111 1001)
If pressed button 2, (ROW 1 COL 2) then PINC= 0xFC(1111 1100)
If pressed button 3, (ROW 1 COL 3) then PINC = 0xED(1110 1101)
If ROW 2 has a logic value 0 and other ROW given logic 1, then: PORTC=0xBF (1011 1111)
If pressed button 4, (ROW 2 COL 1) then PINC= 0xBB(1011 1011)
If pressed button 5, (ROW 2 COL 2) then PINC= 0xBE(1011 1110)
If pressed button 6, (ROW 2 COL 3) then PINC = 0xAF(1010 1111)
If ROW 3 has a logic value 0 and other ROW given logic 1, then: PORTC=0xDF (1101 1111)
If pressed button 7, (ROW 3 COL 1) then PINC= 0xDB(1101 1011)
If pressed button 8, (ROW 3 COL 2) then PINC= 0xDE(1101 1110)
If pressed button 9, (ROW 3 COL 3) then PINC = 0xCF(1100 1111)
If ROW 4 has a logic value 0 and other ROW given logic 1, then: PORTC=0xEF (1111 0111)
If pressed button *, (ROW 4 COL 1) then PINC= 0xF3(1111 0011)
If pressed button 0, (ROW 4 COL 2) then PINC= 0xF6(1111 0110)
If pressed button #, (ROW 4 COL 3) then PINC = 0xE7(1110 0111)
THE CODE
Before we start to crack the code, i’ll tell you that i’m using CodeVision AVR to hack my code. I hope you already knew about this software. But it’s OK if you dont, i’ll explain this tolls on the next post.
Read the binary keypad value with LED

#include 

 #include 

// Declare your global variables here

int read_keypad()

{

int a,button;

PORTC= 0xff;

button=0x00; //

PORTC.1=0;   // Row 1

#asm("nop")

a = PINC;

if (a==0xf9) {button=1; goto fin;}

if (a==0xfc) {button=2; goto fin;}

if (a==0xed) {button=3; goto fin;}

PORTC.6=0; PORTC.1=1; // Row 2

#asm("nop")

a = PINC;

if (a==0xbb) {button=4; goto fin;}

if (a==0xbe) {button=5; goto fin;}

if (a==0xaf) {button=6; goto fin;}

PORTC.5=0; PORTC.6=1; // Row 3

#asm("nop")

a = PINC;

if (a==0xdb) {button=7; goto fin;}

if (a==0xde) {button=8; goto fin;}

if (a==0xcf) {button=9; goto fin;}

PORTC.3=0; PORTC.5=1; // Row 4

#asm("nop")

a = PINC;

if (a==0xf3) {button=10; goto fin;}

if (a==0xf6) {button=11; goto fin;}

if (a==0xe7) button=12;

fin:

return(button);

}

void main(void)

{

// Declare your local variables here

int value;

PORTA=0x00; // out LED

DDRA=0xFF;

// d7=In d6=Out d5=Out d4=In d3=Out d2=In d1=Out d0=In

PORTC=0x00;

DDRC=0x6A;

while (1)

      {

           value= read_keypad();

           PORTA=~value;

           delay_ms(100);

      }

}

Selamat Mencoba!!!!!!!

Sumber :http://awinryd.wordpress.com/

Posted in: Mikrokontroller