microcontroller 10

PIC to PIC Communication using RF Module

Components Required:

1. 2 - Bread board
2. 1 - LCD 16x2
3. 1 – Keypad
4. HT12D and HT12E pair
5. RX-TX RF Module
6. 1- 10K preset
7. 2 – 4.7k resistor
8. 1- 1M Resistor
9. 1- 33k resistor
10. 2- 33pF ceramic capacitors
11. 1 – 20Mhz crystal
12. Bergsticks
13. Few single strand wires.
14. PIC16F877A MCU
15. PIC18F4520 MCU
16. A screw driver for controlling the frequency pot, need to be insulated from human body.

Project Code

/*
 * File:   main.c
 * Author: Sourav Gupta
 * By:- circuitdigest.com
 * Created on April 13, 2018, 2:26 PM
 */

// PIC16F877A Configuration Bit Settings

// 'C' source line config statements

// CONFIG
#pragma config FOSC = HS        // Oscillator Selection bits (HS oscillator)
#pragma config WDTE = OFF       // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = OFF      // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOREN = ON       // Brown-out Reset Enable bit (BOR enabled)
#pragma config LVP = OFF         // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit (RB3/PGM pin has PGM function; low-voltage programming enabled)
#pragma config CPD = OFF        // Data EEPROM Memory Code Protection bit (Data EEPROM code protection off)
#pragma config WRT = OFF        // Flash Program Memory Write Enable bits (Write protection off; all program memory may be written to by EECON control)
#pragma config CP = OFF         // Flash Program Memory Code Protection bit (Code protection off)

#include <xc.h>
#include <stdio.h>
#include <string.h>
#include "supporing_cfile/Keypad.h"
#define RF_TX PORTD

/*
 Hardware related definition
 */
#define _XTAL_FREQ 200000000 //Crystal Frequency, used in delay

/*
 Other Specific definition
 */
void system_init(void);     
void encode_rf_sender (char data);

void main(void){    
    system_init();
    char Key = 'n';        
    while(1){
        
          Key = switch_press_scan();
          encode_rf_sender(Key);                   
        
        
    }

}

/*
 *  System Init
 */

void system_init(void){
    TRISD = 0x00;
    RF_TX = 0x00;
    keyboard_initialization();
}
void encode_rf_sender (char data){    
    if(data=='1')
    RF_TX=0x10;
    if(data=='2')
    RF_TX=0x20;
    if(data=='3')
    RF_TX=0x30;
    if(data=='4')             
    RF_TX=0x40;
    if(data=='5')
    RF_TX=0x50;
    if(data=='6')
    RF_TX=0x60;
    if(data=='7')
    RF_TX=0x70;
    if(data=='8')             
    RF_TX=0x80;
    if(data=='9')
    RF_TX=0x90;
    if(data=='0')
    RF_TX=0x00;
    if(data=='*')
    RF_TX=0xa0;
    if(data=='#')            
    RF_TX=0xb0;
    if(data=='A')            
    RF_TX=0xc0;
    if(data=='B')            
    RF_TX=0xd0;
    if(data=='C')            
    RF_TX=0xe0;
    if(data=='D')            
    RF_TX=0xf0;
}

PIC code for Receiver Side:

/*
 * File:   main.c
 * Author: Sourav Gupta
 *CircuitDigest.com
 * Created on 17 May 2018, 12:18
 */

// PIC18F4520 Configuration Bit Settings

// 'C' source line config statements

// CONFIG1H
#pragma config OSC = INTIO7     // Oscillator Selection bits (Internal oscillator block, CLKO function on RA6, port function on RA7)
#pragma config FCMEN = OFF      // Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor disabled)
#pragma config IESO = OFF       // Internal/External Oscillator Switchover bit (Oscillator Switchover mode disabled)

// CONFIG2L
#pragma config PWRT = OFF       // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOREN = SBORDIS  // Brown-out Reset Enable bits (Brown-out Reset enabled in hardware only (SBOREN is disabled))
#pragma config BORV = 3         // Brown Out Reset Voltage bits (Minimum setting)

// CONFIG2H
#pragma config WDT = ON         // Watchdog Timer Enable bit (WDT enabled)
#pragma config WDTPS = 32768    // Watchdog Timer Postscale Select bits (1:32768)

// CONFIG3H
#pragma config CCP2MX = PORTC   // CCP2 MUX bit (CCP2 input/output is multiplexed with RC1)
#pragma config PBADEN = OFF      // PORTB A/D Enable bit (PORTB<4:0> pins are configured as analog input channels on Reset)
#pragma config LPT1OSC = OFF    // Low-Power Timer1 Oscillator Enable bit (Timer1 configured for higher power operation)
#pragma config MCLRE = ON       // MCLR Pin Enable bit (MCLR pin enabled; RE3 input pin disabled)

// CONFIG4L
#pragma config STVREN = ON      // Stack Full/Underflow Reset Enable bit (Stack full/underflow will cause Reset)
#pragma config LVP = OFF        // Single-Supply ICSP Enable bit (Single-Supply ICSP disabled)
#pragma config XINST = OFF      // Extended Instruction Set Enable bit (Instruction set extension and Indexed Addressing mode disabled (Legacy mode))

// CONFIG5L
#pragma config CP0 = OFF        // Code Protection bit (Block 0 (000800-001FFFh) not code-protected)
#pragma config CP1 = OFF        // Code Protection bit (Block 1 (002000-003FFFh) not code-protected)
#pragma config CP2 = OFF        // Code Protection bit (Block 2 (004000-005FFFh) not code-protected)
#pragma config CP3 = OFF        // Code Protection bit (Block 3 (006000-007FFFh) not code-protected)

// CONFIG5H
#pragma config CPB = OFF        // Boot Block Code Protection bit (Boot block (000000-0007FFh) not code-protected)
#pragma config CPD = OFF        // Data EEPROM Code Protection bit (Data EEPROM not code-protected)

// CONFIG6L
#pragma config WRT0 = OFF       // Write Protection bit (Block 0 (000800-001FFFh) not write-protected)
#pragma config WRT1 = OFF       // Write Protection bit (Block 1 (002000-003FFFh) not write-protected)
#pragma config WRT2 = OFF       // Write Protection bit (Block 2 (004000-005FFFh) not write-protected)
#pragma config WRT3 = OFF       // Write Protection bit (Block 3 (006000-007FFFh) not write-protected)

// CONFIG6H
#pragma config WRTC = OFF       // Configuration Register Write Protection bit (Configuration registers (300000-3000FFh) not write-protected)
#pragma config WRTB = OFF       // Boot Block Write Protection bit (Boot block (000000-0007FFh) not write-protected)
#pragma config WRTD = OFF       // Data EEPROM Write Protection bit (Data EEPROM not write-protected)

// CONFIG7L
#pragma config EBTR0 = OFF      // Table Read Protection bit (Block 0 (000800-001FFFh) not protected from table reads executed in other blocks)
#pragma config EBTR1 = OFF      // Table Read Protection bit (Block 1 (002000-003FFFh) not protected from table reads executed in other blocks)
#pragma config EBTR2 = OFF      // Table Read Protection bit (Block 2 (004000-005FFFh) not protected from table reads executed in other blocks)
#pragma config EBTR3 = OFF      // Table Read Protection bit (Block 3 (006000-007FFFh) not protected from table reads executed in other blocks)

// CONFIG7H
#pragma config EBTRB = OFF      // Boot Block Table Read Protection bit (Boot block (000000-0007FFh) not protected from table reads executed in other blocks)

// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.

#include <xc.h>
#include "supporing_cfile\lcd.h"

#define RF_RX PORTD

void system_init (void);
void rf_analysis (unsigned char recived_byte);

void main(void) {
    unsigned char byte = 0;
    system_init();
    lcd_init();   
    while(1){
        lcd_com(0x80); 
        lcd_puts("CircuitDigest");
        lcd_com (0xC0);        
        byte = RF_RX;                       
        rf_analysis(byte);
        lcd_com (0xC0);
    }
    return;
}

void system_init (void){
    OSCCON = 0b01111110; // 8Mhz, , intosc
    //OSCTUNE = 0b01001111; // PLL enable, Max prescaler 8x4 = 32Mhz    
    TRISB = 0x00;
    TRISD = 0xFF; // Last 4 bit as input bit.
}

void rf_analysis (unsigned char recived_byte){    
        if(recived_byte==0x10)
        lcd_data('1');
        if(recived_byte==0x20)
        lcd_data('2');
        if(recived_byte==0x30)
        lcd_data('3');
        if(recived_byte==0x40)
        lcd_data('4');
        if(recived_byte==0x50)
        lcd_data('5');
        if(recived_byte==0x60)
        lcd_data('6');
        if(recived_byte==0x70)
        lcd_data('7');
        if(recived_byte==0x80)
        lcd_data('8');
        if(recived_byte==0x90)
        lcd_data('9');
        if(recived_byte==0x00)
        lcd_data('0');
        if(recived_byte==0xa0)
        lcd_data('*');
        if(recived_byte==0xb0)
        lcd_data('#');
        if(recived_byte==0xc0)
        lcd_data('A');
        if(recived_byte==0xd0)
        lcd_data('B');
        if(recived_byte==0xe0)
        lcd_data('C');
        if(recived_byte==0xf0)
        lcd_data('D');                           
}