Im using Arduino Uno and Arduino Gsm/GPRS SIM900 and PIR sensor. I have a problem in this project. Let me brief my project. After the PIR sensor detected any motion it will send a message to my hand phone. After that its depends on me to reply the message as " on the alarm" or " reset ". Than the Arduino should perform accordingly to my reply. I have a coding but its not working. I'm new to arduino and coding so i can't identify the problem. Anyone please solve my problem. Need it very urgent. Please guys. Advance thank for those help me.
The code you attached does not compile. Also, better get used to indent your code or you won't know what's in what in the code. I fixed and indented the code, also modified some parts that didn't make any sense.
While it does compile now, I didn't test it (i don't have a PIR sensor).
Also, your SIM900 module does not need to be turned on before starting using it?
#include <SoftwareSerial.h>
#include "pins_arduino.h"
#include <String.h>
SoftwareSerial SIM900(7, 8);
String msg = String("");
char data;
//int alarm_light = 5;
int led = 13;
int pir_snsr=10;
int val,pos,output,pir_output;
int count_pir=0;
int ind_pir=0;
String index;
boolean sms_content_flag_on = 0;
boolean sms_content_flag_off = 0;
boolean sms_content_flag_critical = 0;
boolean sms_content_flag_pir = 0;
void setup() {
SIM900.begin(19200); // the GPRS baud rate
Serial.begin(19200); // the Serial port of Arduino baud rate.
delay(500);
SIM900.println("AT+CPIN=4510"); //the pin code for the sim
delay(5000);
SIM900.println("AT+CMGF=1"); //sets the text mode
delay(1000);
pinMode(led,OUTPUT);
pinMode(pir_snsr,INPUT);
//pinMode(alarm_light,OUTPUT);
//digitalWrite(led,HIGH);
//delay(500);
SIM900.println("AT+CMGDA=\"DEL ALL\""); //delete all the messages available in the storage area
delay(1000);
}
void loop() {
read_pirsensor(); //function to read the pir sensor
if (SIM900.available()) { // if date is comming from softwareserial port ==> data is comming from gprs shield
while(SIM900.available()) {
data = SIM900.read(); //read the data available in the SIM900 buffer and store it in string msg
msg += data;
}
Serial.println(msg);
if(msg.indexOf("+CMTI") >= 0) { //if the sms is received then go to process gprs
Serial.println("goes inside cmti");
process_gprs();
} else {
clear_msg(); //Modified by Spyd
}
}
}
/**********************************************************
READ THE PIR SENSOR
*************************************************************/
void read_pirsensor() {
pir_output = digitalRead(pir_snsr);
delay(1000);
Serial.println(pir_output);
if(pir_output == HIGH){
count_pir = count_pir+1;
Serial.println(count_pir);
if(count_pir > 0){ //Modified by Spyd
sms_content_flag_pir = 1;
send_sms();
}
}
}
/**********************************************************************
SEARCH THE INDEX OF THE SMS AND READ THE CONTENT OF THE SMS MESSAGE
*********************************************************************/
void process_gprs(){
pos = msg.indexOf(",");
//search for the position of , to find the index of sms
//Serial.println(pos);
String index = msg.substring(pos+1);
//the index of sms to be processed
Serial.println(index);
SIM900.print("AT+CMGR = ");
SIM900.println(index);
//read the incoming sms
delay(1000);
if(msg.indexOf("+CMGR") >=0){
Serial.println("goes inside cmgr");
process_sms();
}
}
/******************************************************************
PERFORMS THE ACTION ACCORDING TO THE CONTENT OF THE MESSAGE
*****************************************************************/
void process_sms() {
Serial.println("goes inside process_sms");
if(msg.indexOf("Turn light on") >= 0){
Serial.println("goes inside on");
digitalWrite(led,HIGH);
}
if (msg.indexOf("Turn light off") >= 0){
Serial.println("goes inside off");
digitalWrite(led,LOW);
}
/*switch(val){ //Spyd: val variable is never used
case 0:
Serial.println("it is inside the case0");
sms_content_flag_off=1;
send_sms();
break;
case 1:
sms_content_flag_on =1;
send_sms();
Serial.println("it is inside the case1");
Serial.println(val);
break;
}*/
SIM900.print("AT+CMGD=");
SIM900.println(index); //removes the message after it is executed to keep the sim memory free
SIM900.flush(); //removes all the data from the RX buffer of softwareserial whether it is read or unread
delay(1000);
clear_msg();
Serial.println("the buffer is deleted cleared");
}
void clear_msg(){
msg="";
}
/***********************************************
SENDS THE SMS MESSAGES TO THE MOBILE PHONE
**********************************************/
void send_sms(){
//SIM900.println("AT+CMGF=1");
SIM900.println("AT + CMGS = \"+60********70\""); //FIX THE PHONE NUMBER
//send sms message, be careful need to
//add a country code before the cellphone number
delay(100);
if(sms_content_flag_on == 1) {
SIM900.println("The light is on ");//the content of the message
}
if(sms_content_flag_off == 1) {
SIM900.println("The light is off ");
}
if(sms_content_flag_pir == 1){
ind_pir++;
SIM900.println("Someone is moving around your house");
}
SIM900.println((char)26);//the ASCII code of the ctrl+z is 26
delay(100);
SIM900.println();
clear_sms_content_flags();
msg="";
}
/*****************************************************
CLEARS THE FLAGS SET
****************************************************/
void clear_sms_content_flags(){
sms_content_flag_on = 0;
sms_content_flag_off = 0;
sms_content_flag_critical = 0;
sms_content_flag_pir = 0;
}
hmmm. The coding still not functioning. Sensor is working properly because it detecting the motion but i din get any message from the arduino. Please check for me the coding.
