i am working on a embedded project using GSM SIM300.i am using Atmel at89s52, GSM module ,temperature sensor LM35.
Working of project- Temp sensor will sense the temperature and sent a message to my cell phone only if the temperature is above 30^c,,and if i sent a SMS to the cell phone(for eg-OK),the relay connected to the microcontroller should turn ON.My code is as follows-
#include<reg51.h> #include<stdio.h> #define MYDATA P1; sbit ALE=P2^4; sbit OE=P2^5; sbit SC=P2^6; sbit EOC=P2^7; sbit ADDR_A=P2^0; sbit ADDR_B=P2^1; sbit MOTOR=P2^2; unsigned char rx[20],msg[6]; unsigned char sensor1,adc1,r; void clear(void) { unsigned char r; for(r=0;r<100;r++) rx[r]=0x00; } void clear1(void) //user msg { unsigned char n; for(n=0;n<=5;n++) msg[n]=0x00; } void serialcomm() { TMOD=0x20; // Mode=2 TH1=0xfd; // 9600 baud SCON=0x50; // Serial mode=1 ,8-Bit data,1 Stop bit ,1 Start bit , Receiving on TR1=1; // Start timer } void delay(unsigned int value) { unsigned int i,j; for(i=0;i<value;i++) for(j=0;j<1275;j++); } void serial(unsigned char x) { SBUF=x; while(TI==0); TI=0; } void Send2Gsm(char *aaa) { while(*aaa!='\0') { serial(*aaa); aaa++; } } unsigned char convert(void) { unsigned char value; delay(1); ALE=1; delay(1); SC=1; delay(1); ALE=0; SC=0; while(EOC==1); while(EOC==0); OE=1; delay(1); value=MYDATA; OE=0; return(value); } void receive_data() interrupt 4 // Function to recieve data serialy from RS232 into uc { unsigned char r; rx[r]=SBUF; // Read sbuf RI=0; } void main() { char string1[10}; int temp; serialcomm(); Send2Gsm("AT\r\n"); delay(2); Send2Gsm("AT+CMGF=1\r\n"); delay(2); Send2Gsm("AT+CMGS= +918762357075\r\n"); delay(2); Send2Gsm("hello"); serial(0x1a); while(1) { ADDR_B=0; ADDR_A=0; sensor1=convert(); if(sensor1>60 ) { temp=(adc1*0.489); sprintf(string1,"%d",temp); delay(500); Send2Gsm("Temperature="); Send2Gsm(string1); Send2Gsm("*c"); delay(500); serial(0x1A); delay(500); IE=0x90; while(rx[r]=='?') { IE=0x00; //disable interrupt if(rx[0]=='*' && rx[1]=='O' && rx[2]=='N' ) { MOTOR=1; clear(); clear1(); } else if(rx[0]=='*' && rx[1]=='O' && rx[2]=='F') { MOTOR=0; clear(); clear1(); } } } } }
i am not getting output with this code.i am having doubt with the recieving sms to the gsm modem.can anyone point out the mistakes in my code ??
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