[PIC] PIC16F877A ,GSM, LCD16x2,MPLAB IDE

[Vivz Boonchi]

#include<htc.h>
__CONFIG(FOSC_HS&WDTE_OFF&PWRTE_OFF&BOREN_OFF&LVP_OFF);
#define _XTAL_FREQ 20000000
#define ON RB0	
#define OFF RB1
#define PIR RB2 	
#define MAG RB3		
#define LCD_rs RA2
#define LCD_en RA3
#define LCD_data PORTD
#define BUZZER RC3
#define AUTOLOCK RC4
#define LED_ON RB6
#define LED_OFF RB7
#define LED2 RB5

void LCD_sendcommand(unsigned char cmd)
{
	LCD_data=cmd;
	LCD_rs=0;
	LCD_en=1;
	__delay_ms(1);
	LCD_en=0;
	__delay_ms(2);
}

void LCD_senddata(unsigned char data)
{
	LCD_data=data;
	LCD_rs=1;
	LCD_en=1;
	__delay_ms(1);
	LCD_en=0;
	__delay_ms(2);
}

void LCD_sendstringdata(unsigned char* data)
{
	while(*data!='\0')
	{
		LCD_senddata(*data);
		data++;
	}
}

void LCD_init()
{
__delay_ms(15);
LCD_sendcommand(0x38);
LCD_sendcommand(0x0F);
LCD_sendcommand(0x00);
LCD_sendcommand(0x06);
}


void UART_Init()
{
	BRGH = 1;
    SPBRG = 64;
    SYNC = 0;
    SPEN = 1;
    TRISC = 0b10000000; 
    CREN = 1;
    TXEN = 1;
     
}

char UART_TX_Empty()
{
  return TRMT;
}

char UART_Data_Ready()
{
   return RCIF;
}
char UART_Read()
{
 
  while(!RCIF);
  return RCREG;
}

void UART_Read_Text(char *Output, unsigned int length)
{
   int i;
   for(int i=0;i<length;i++)
      Output[i] = UART_Read();
}

void UART_Write(char data)
{
  while(!TRMT);
  TXREG = data;
}

void UART_Write_Text(char *text)
{
  int i;
  for(i=0;text[i]!='\0';i++)
     UART_Write(text[i]);
}


//**********************AT commands initialization**************
char AT[]="AT";
char noecho[]="ATE0";
char mode_text[]="AT+CMGF=1";
char mobile_no[]="AT+CMGS="+60142107184"";
char terminator=0x1A;
char text[]="intruder!!";


//********************String transmit function****************
void send_to_modem(char *s)
{
while(*s)			
{
UART_Write(*s++);
}
UART_Write(0X0D);
}

void send_to_modem1(char *s)
{
while(*s)
UART_Write(*s++);
}
void send_sms()
{
send_to_modem(text);
__delay_ms(1000);			
UART_Write(terminator);
__delay_ms(1000);
}


void main()
{
TRISB=0b00001111;
PORTB=0X00;
TRISA=0X00;
PORTA=0X00;
TRISC=0X00;
PORTC=0X00;
TRISD=0X00;
PORTD=0X00;
LCD_init();
ADCON1=0x06;
UART_Init(19200);		

while(1)
{ 
{
if (ON==1)
	{
	 RB6=1;
	 RB7=0;
	}
else if (OFF==1)
	{
	RB7=1;
	RB6=0;
	AUTOLOCK=0;
	BUZZER=0;
	LED2=0;
	LCD_sendcommand(0x08);

	}

if(PIR==1)
	{
	AUTOLOCK=1;
	BUZZER=1;
	LED2=1;
	LCD_sendcommand(0x80);
	LCD_sendstringdata("shutup");
	send_to_modem(AT);
	__delay_ms(1000);
	send_to_modem(noecho);
	__delay_ms(1000);
	send_to_modem(mode_text);
	__delay_ms(1000);
	send_to_modem(mobile_no);
	__delay_ms(1000);
	send_sms(); 
	__delay_ms(10000); 
	}
else if(MAG==1)
	{
	AUTOLOCK=1;
	BUZZER=1;
	LED2=1;
	LCD_sendcommand(0x80);
	LCD_sendstringdata("Intruders!!!!!!");
	send_to_modem(AT);
	__delay_ms(1000);
	send_to_modem(noecho);
	__delay_ms(1000);
	send_to_modem(mode_text);
	__delay_ms(1000);
	send_to_modem(mobile_no);
	__delay_ms(1000);
	send_sms(); 
	__delay_ms(10000); 
	}	


}
}
}

With coding above,LCD cant display correctly and GSM cant send message.
Please help!
Thanks.:smile:

 

[Vivz Boonchi]

Can anyone show me how to connect sim900a with pic16f877a?
I cant find any datasheet.
Thanks.

 

[Mrunal Ahirrao]

Hi you need to use a level shifter between SIM900 and PIC. See the attachment.