MIKROE-86 mikroElektronika, MIKROE-86 Datasheet - Page 3

• Manufacturer Part Number: MIKROE-86
• Description: Daughter Cards & OEM Boards KEYPAD 4x4 ADAPTER BOARD
• Manufacturer: mikroElektronika

Specifications of MIKROE-86

• Rohs: yes
• Product: Keypad 4X4 Additional Boards
• Description/function: Keypad 4X4 is used for loading numerics into the microcontrollers
• Interface Type: IDC10
• Operating Supply Voltage: 3.3 V, 5 V
• For Use With: Development Boards

Keypad 4x4
Example 1: Program written in mikroC PRO for PIC
unsigned short kp, cnt, oldstate = 0;
char txt[6];
char keypadPort at PORTD;
sbit LCD_RS at RB4_bit;
sbit LCD_EN at RB5_bit;
sbit LCD_D4 at RB0_bit;
sbit LCD_D5 at RB1_bit;
sbit LCD_D6 at RB2_bit;
sbit LCD_D7 at RB3_bit;
sbit LCD_RS_Direction at TRISB4_bit;
sbit LCD_EN_Direction at TRISB5_bit;
sbit LCD_D4_Direction at TRISB0_bit;
sbit LCD_D5_Direction at TRISB1_bit;
sbit LCD_D6_Direction at TRISB2_bit;
sbit LCD_D7_Direction at TRISB3_bit;
void main() {
cnt = 0;
Keypad_Init();
ANSEL = 0;
ANSELH = 0;
Lcd_Init();
Lcd_Cmd(_LCD_CLEAR);
Lcd_Cmd(_LCD_CURSOR_OFF);
Lcd_Out(1, 1, “1”);
Lcd_Out(1, 1, “Key :”);
Lcd_Out(2, 1, “Times:”);
do {
kp = 0;
// Wait for key to be pressed and released
do
while (!kp);
switch (kp) {
kp = Keypad_Key_Click();
//case 10: kp = 42; break; // ‘*’
//case 11: kp = 48; break; // ‘0’
//case 12: kp = 35; break; // ‘#’
//default: kp += 48;
Figure 4: Keypad, LCD and microcontroller connection schematic
// Prepare value for output, transform key to it’s ASCII value
// Keypad module connections
// End Keypad module connections
// LCD module connections
// End LCD module connections
// Reset counter
// Initialize Keypad
// Configure AN pins as digital I/O
// Initialize LCD
// Clear display
// Cursor off
// Write message text on LCD
// Reset key code variable
// Store key code in kp variable
// Uncomment this block for keypad4x3
}
} while (1);
}
if (kp != oldstate) {
else {
Lcd_Chr(1, 10, kp);
if (cnt == 255) {
WordToStr(cnt, txt);
Lcd_Out(2, 10, txt);
case 1: kp = 49; break; // 1
case 2: kp = 50; break; // 2
case 3: kp = 51; break; // 3
case 4: kp = 65; break; // A
case 5: kp = 52; break; // 4
case 6: kp = 53; break; // 5
case 7: kp = 54; break; // 6
case 8: kp = 66; break; // B
case 9: kp = 55; break; // 7
case 10: kp = 56; break; // 8
case 11: kp = 57; break; // 9
case 12: kp = 67; break; // C
case 13: kp = 42; break; // *
case 14: kp = 48; break; // 0
case 15: kp = 35; break; // #
case 16: kp = 68; break; // D
cnt = 1;
oldstate = kp;
}
cnt++;
}
cnt = 0;
Lcd_Out(2, 10, “ “);
}
// Uncomment this block for keypad4x4
// Pressed key differs from previous
// Pressed key is same as previous
// Print key ASCII value on LCD
// If counter varialble overflow
// Transform counter value to string
// Display counter value on LCD
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