I'm desperately looking for a solution for my SIM800l v2. The network LED just keeps blinking every second. It does not restart but it keeps blinking and not picking up a signal.
I tried powering up using a laptop USB port but it does not solve it. I also used a charger adapter that is 5V and 2A but still does not solve the problem. I also tried changing the sim card but still does not solve the problem.
Here is the Wiring diagram that I followed:
Credits to miliohm.com
Code:
SoftwareSerial sim(10, 11);
int _timeout;
String _buffer;
String number = "+6281222329xxx"; //-> change with your number
void setup() {
//delay(7000); //delay for 7 seconds to make sure the modules get the signal
Serial.begin(9600);
_buffer.reserve(50);
Serial.println("Sistem Started...");
sim.begin(9600);
delay(1000);
Serial.println("Type s to send an SMS, r to receive an SMS, and c to make a call");
}
void loop() {
if (Serial.available() > 0)
switch (Serial.read()) {
case 's':
SendMessage();
break;
case 'r':
RecieveMessage();
break;
case 'c':
callNumber();
break;
}
if (sim.available() > 0)
Serial.write(sim.read());
}
void SendMessage() {
//Serial.println ("Sending Message");
sim.println("AT+CMGF=1"); //Sets the GSM Module in Text Mode
delay(200);
//Serial.println ("Set SMS Number");
sim.println("AT+CMGS=\"" + number + "\"\r"); //Mobile phone number to send message
delay(200);
String SMS = "Hello, how are you? greetings from miliohm.com admin";
sim.println(SMS);
delay(100);
sim.println((char)26);// ASCII code of CTRL+Z
delay(200);
_buffer = _readSerial();
}
void RecieveMessage() {
Serial.println ("SIM800L Read an SMS");
sim.println("AT+CMGF=1");
delay(200);
sim.println("AT+CNMI=1,2,0,0,0"); // AT Command to receive a live SMS
delay(200);
Serial.write ("Unread Message done");
}
String _readSerial() {
_timeout = 0;
while (!sim.available() && _timeout < 12000) {
delay(13);
_timeout++;
}
if (sim.available()) {
return sim.readString();
}
}
void callNumber() {
sim.print (F("ATD"));
sim.print (number);
sim.print (F(";\r\n"));
_buffer = _readSerial();
Serial.println(_buffer);
}
I was also stuck on this for ages. Got a DC-DC converter to ensure I had the right voltage. I connected caps on both sides of the DC-DC. I tried most everything to no avail.
My issue in the end was the inefficiency of breadboards and jumper wires. So if you are using a breadboard or jumper wires, shorten them as much as possible, like 2-3cm to ensure that enough current can be delivered to the SIM800L module
Try to connect a cap as close as possible between Vcc and GND. If the module connects to the network after you entered the SIM pin the current rises and may causes a voltage drop.
Related
I have an AI Thinker A9G module connected to an ESP8266 D1 mini. I have the following script to send and receive AT commands to/from the module. The idea is to get a SMS with the Google maps GPS location of the module onto my mobile phone.
// GPS tracker with AI Thinker A9G module and AZ Delivery D1 Mini ESP8266 module
#include <SoftwareSerial.h>
#define rxPin D7
#define txPin D8
SoftwareSerial A9modem(rxPin, txPin); // Pins D7 Rx and D8 Tx are used as used as software serial pins
String incomingData; // For storing incoming serial data
String gpsData; // For storing location data
char msg;
char call;
void setup()
{
Serial.begin(115200); // Baud rate for serial monitor
A9modem.begin(115200); // Baud rate for GSM shield
Serial.println("GPS/GSM A9G BEGIN");
Serial.println("Enter character for control option: ");
Serial.println("h : to disconnect a call");
Serial.println("s : to send a message");
Serial.println("r : to receive a message");
Serial.println("c : to make a call");
Serial.println("l : to read location");
Serial.println("d : to disconnect gps");
Serial.println();
delay(100);
// Set SMS mode to text mode
A9modem.print("AT+CMGF=1\r");
delay(100);
// Set GSM module to TP show the output on serial out
A9modem.print("AT+CNMI=2,2,0,0,0\r");
delay(100);
}
void loop()
{
ReceiveMessage();
gpsData = incomingData.substring(33, 52);
Serial.print("Location: ");
Serial.println(gpsData);
delay(2000);
if (Serial.available() > 0)
switch(Serial.read())
{
case 's':
SendMessage();
break;
case 'r':
ReceiveMessage();
break;
case 'c':
MakeCall();
break;
case 'h':
HangupCall();
break;
case 'l':
ReadLocation();
break;
case 'd':
DisconnectGps();
break;
}
}
void ReceiveMessage()
{
if (A9modem.available() > 0)
{
incomingData = A9modem.readString(); // Get the data from the serial port
Serial.print(incomingData);
delay(100);
}
}
void SendMessage()
{
A9modem.println("AT+CMGF=1"); // Sets the GSM Module into text mode
delay(1000); // Delay of one second
A9modem.println("AT+CMGS=\"xxxxxxxxxxxxx\"\r"); // Replace your mobile number here
delay(1000);
String sms = "http://maps.google.com/maps?q=" + gpsData; // Create the SMS location string
A9modem.println(sms);
delay(100);
A9modem.println((char)26); // ASCII code of CTRL+Z
delay(1000);
}
void MakeCall()
{
A9modem.println("ATD+xxxxxxxxxxxxx;"); // Replace your mobile number here
Serial.println("Calling "); // Print response over serial port
delay(1000);
}
void HangupCall()
{
A9modem.println("ATH");
Serial.println("Hangup Call");
delay(1000);
}
void DisconnectGps()
{
A9modem.println("AT+GPS=0");
Serial.println("Disconnect GPS");
delay(1000);
}
void ReadLocation()
{
A9modem.println("AT+GPS=1");
delay(1000);
A9modem.println("AT+LOCATION=2"); // Check location every two seconds
delay(2000);
}
So if I use the commands "l" and "s" in Arduino IDE serial monitor everything is working well but I don't know how to change the code in a way that I get a fully automated GPS tracker. The idea is the following: Power on starts the tracker. When gpsData string is not empty the first SMS will be send to my mobile phone. The next SMS follows 20 minutes later and so on until power is switched off. Could you help please?
Thanks in advance!
Finally I came up with this solution but I'm not very happy with it (it is working but I have to restart the module from time to time because there are no GPS data). There are 3 reasons for this: There is no error handling for the GPS function, I set the delays in a more ore less random way to get everything working but I don't know if the values make sense and I don't know if the substring() function is the best way to get the location from the serial response.
// GPS tracker with AI Thinker A9G module and AZ Delivery D1 Mini
ESP8266 module
#include <SoftwareSerial.h>
#define rxPin D7
#define txPin D8
SoftwareSerial A9modem(rxPin, txPin); // Pins D7 Rx and D8 Tx are used as used as software serial pins
String incomingData; // For storing incoming serial data
String gpsData; // For storing location data
int runGps = 1;
int sendSms = 0;
void setup()
{
pinMode(LED_BUILTIN, OUTPUT); // Use builtin LED for correct GPS status
Serial.begin(115200); // Baud rate for serial monitor
A9modem.begin(115200); // Baud rate for GSM shield
// Set SMS mode to text mode
A9modem.print("AT+CMGF=1\r");
delay(300);
// Set GSM module to TP show the output on serial out
A9modem.print("AT+CNMI=2,2,0,0,0\r");
delay(1000);
Serial.end();
delay(500);
}
void loop()
{
Serial.begin(115200);
ReceiveMessage(); // Start a new serial stream
gpsData = incomingData.substring(33, 52); // Strip all unnessesary data from the stream
Serial.print("Location: "); // Check if the location data are correct
Serial.println(gpsData);
delay(1000);
if(runGps == 1) { // Start GPS
ReadLocation();
delay(20000); // Wait for GPS to be ready
}
if(gpsData.length() == 19 && sendSms == 0) { // If the location string is correct send SMS
if (isdigit(gpsData.charAt(0))) { // Check if the stream starts with a number
SendMessage();
digitalWrite(LED_BUILTIN, HIGH);
delay(300);
digitalWrite(LED_BUILTIN, LOW);
delay(300);
digitalWrite(LED_BUILTIN, HIGH);
delay(300);
digitalWrite(LED_BUILTIN, LOW);
delay(300);
digitalWrite(LED_BUILTIN, HIGH);
}
}
if(runGps == 0 && sendSms == 1) {
runGps = 1;
sendSms = 0;
delay(6000); // Make sure that all SMS serial communication is over
while (A9modem.available()) {
A9modem.read(); // Delete all data from serial buffer
}
delay(300000); // If SMS was sent wait 5 minutes before running the main loop again
Serial.end();
delay(500);
}
}
void ReceiveMessage()
{
if (A9modem.available() > 0)
{
incomingData = A9modem.readString(); // Get the data from the serial port
Serial.print(incomingData);
delay(500);
}
}
void SendMessage()
{
sendSms = 1; // Stop starting the SendMessage function
A9modem.println("AT+CMGF=1"); // Sets the GSM Module into text mode
delay(1000);
A9modem.println("AT+CMGS=\"xxxxxxxxxx\"\r"); // Replace your mobile number here
delay(1000);
String sms = "http://maps.google.com/maps?q=" + gpsData; // Create the SMS string
A9modem.println(sms);
delay(500);
A9modem.println((char)26); // ASCII code of CTRL+Z
delay(500);
}
void ReadLocation()
{
runGps = 0; // Stop starting the ReadLocation function
A9modem.println("AT+GPS=1");
delay(1000);
A9modem.println("AT+LOCATION=2"); // Check location every two seconds
delay(2000);
}
Try turning ON the NMEA stream from the A9G. Say you want to get the NMEA data every t seconds, you can add and then call the following function once in the void setup()
void TurnOnNMEA(int t)
{
if(t > 3600)
t = 3600; // Because the max time is 3600s
A9modem.print("AT+GPSRD=");
A9modem.println(t);
while(!A9modem.available()); // wait till the A9G sends a response
char c;
while(A9modem.available())
{
c = A9modem.read();
Serial.print(c);
delay(2); // Time needed for the next character
}
}
This will start the NMEA data stream every t seconds which you can print using the following function,
void ReadNMEA()
{
char c; // Read each character from the stream as it comes
if(A9modem.available())
{
c = A9modem.read();
Serial.print(c);
delay(2); // Time needed for the next character
}
}
Parsing and decoding the NMEA is a bit tricky thing to do. There is a lot of information inside it and the decoding depends on what you want to do with it. If you just want the location, you can parse the $GNGGA line.
When parsing the data, DO NOT USE Arduino String() class. It is a very bad idea when handling this kind of stream. Instead, use char array.
#include <SoftwareSerial.h>
SoftwareSerial mySerial(0, 1);
void setup()
{
mySerial.begin(9600); // Setting the baud rate of GSM Module
Serial.begin(9600); // Setting the baud rate of Serial Monitor (Arduino)
delay(100);
}
void loop()
{
if (Serial.available()>0)
SendMessage();
if (mySerial.available()>0)
Serial.write(mySerial.read());
}
void SendMessage()
{
mySerial.println("AT+CMGF=1"); //Sets the GSM Module in Text Mode
delay(1000); // Delay of 1000 milli seconds or 1 second
mySerial.println("AT+CMGS=\"+1876xxxxxxx\"\r"); // Replace x with mobile number
delay(1000);
mySerial.println("I am SMS from GSM Module");// The SMS text you want to send
delay(100);
mySerial.println((char)26);// ASCII code of CTRL+Z
delay(1000);
}
I am trying to send a sms using SIM 800 RPI GSM ADD-on v2.3 module through the arduino platform however everything I try fails. Please assist and explain where i am going wrong. Thank you. My code is above. Thanks
You are missing a carriage return in "AT+CMGF=1".
Change "AT+CMGF=1" to "AT+CMGF=1\r"
Although having delays between command works and suffices the purpose but is not recommended.
It is preferable to catch and analyze the messages returned by the SIM800 especially in case of error has occurred.
INTRO:
I'm a novice when it comes to Arduino programming and using AT commands. I already tried to search the whole internet and asked on Arduino forum, but I have no luck and nobody seems to give me a clear idea about it there.
PROBLEM:
So, I have this code where an SMS command can switch on and off the light and it will response to a specific phone number only. My problem is, the program response even when I'm using different phone numbers. I hope there's a way which it can only whitelist a specific number so no one can prank the program without the owner's knowledge.
FOR EXAMPLE:
The owner's phone number is +631234567890
Some random phone number: +63xxxxxxxxxx
The owner can switch on and off the light. [YES]
But supposedly, the random phone number CAN NOT and will never have the authority to switch the lights on and off. Only the owner can.
HERE'S MY CURRENT CODE: CCTO
#include <SoftwareSerial.h>
SoftwareSerial GPRS(10, 11);
String textMessage;
String lampState;
const int relay = 12;
void setup() {
pinMode(relay, OUTPUT);
digitalWrite(relay, HIGH);
Serial.begin(9600);
GPRS.begin(9600);
delay(5000);
Serial.print("GPRS ready...\r\n");
GPRS.print("AT+CMGF=1\r\n");
delay(1000);
GPRS.print("AT+CNMI=2,2,0,0,0\r\n");
delay(1000);
}
void loop(){
if(GPRS.available()>0){
textMessage = GPRS.readString();
Serial.print(textMessage);
delay(10);
}
if(textMessage.indexOf("ON")>=0){
// Turn on relay and save current state
digitalWrite(relay, HIGH);
lampState = "ON";
Serial.println("Lamp set to ON\r\n");
textMessage = "";
GPRS.println("AT+CMGS=\"+631234567890\"");
delay(500);
GPRS.print("Lamp was finally switched ON.\r");
GPRS.write( 0x1a );
delay(1000);
}
if(textMessage.indexOf("OFF")>=0){
// Turn off relay and save current state
digitalWrite(relay, LOW);
lampState = "OFF";
Serial.println("Lamp set to OFF\r\n");
textMessage = "";
GPRS.println("AT+CMGS=\"+631234567890\"");
delay(500);
GPRS.print("Lamp was finally switched OFF.\r");
GPRS.write( 0x1a );
delay(1000);
}
if(textMessage.indexOf("STATUS")>=0){
String message = "Lamp is " + lampState;
GPRS.print("AT+CMGF=1");
delay(1000);
Serial.println("Lamp state resquest");
textMessage = "";
GPRS.println("AT+CMGS=\"+631234567890\"");
delay(500);
GPRS.print("Lamp is currently ");
GPRS.println(lampState ? "ON" : "OFF");
GPRS.write( 0x1a );
delay(1000);
}
}
How can I do that?
Your textMessage must contain an information about sender and time of the message. Something like this:
+CMGL: 2,"REC UNREAD","+63xxxxxxxxxx",,"07/02/18,00:07:22+32" A simple demo of SMS text messaging.
So, you need to extract the phone number at compare it with the authorized one.
You can define the desired phone number in the code and compare it with the number assigned to the incoming SMS. If the number matches the one in your code, proceed with the algorithm. Otherwise, ignore the message.
Got this code from the official Arduino Forum, which you can check out from the link given at the end. You can code out these two functions:
String CellNumtemp;
String CellNum;
// check if there are incoming SMS
void ricezione(){
Serial.println ("controllo ricezione SMS");
// AT command to set mySerial to SMS mode
mySerial.print("AT+CMGF=1\r");
delay(100);
// Read the first SMS saved in the sim
mySerial.print("AT+CMGR=1\r");
delay(10);
if(mySerial.available()>0){
textMessage = mySerial.readString();
Serial.print(textMessage);
delay(10);
}
// check if the SMS is "STATO"
if(textMessage.indexOf("STATO")>=0){
Serial.println("Invio info stato arnia");
//save the phone number of the senders in a string (this works with italian region you must adapt to yours)
CellNumtemp = textMessage.substring(textMessage.indexOf("+39"));
CellNum = CellNumtemp.substring(0,13);
smsstato();
CellNumtemp = "";
textMessage = "";
}
mySerial.print("AT+CMGD=1\r");
delay(100);
mySerial.print("AT+CMGD=2\r");
delay(100);
}
// Send sms with all the information to the number stored
void smsstato(){
// delete the first SMS
mySerial.print("AT+CMGD=1\r");
delay(100);
mySerial.print("AT+CMGF=1\r");
delay(1000);
mySerial.print("AT+CMGS=\"");
mySerial.print(CellNum);
mySerial.print("\"\r");
delay(1000);
//The text of the message to be sent.
mySerial.print("INFO: Latitudine: ");
mySerial.print(latitude);
mySerial.print(", Longitudine: ");
mySerial.print(logitude);
mySerial.print(", Ampere: ");
mySerial.print(consumotemp);
delay(1000);
mySerial.write(0x1A);
delay(1000);
Serial.println("sms stato");
}```
Thanks to the user ilteo85 on the https://forum.arduino.cc.
Check this out for reference: https://forum.arduino.cc/index.php?topic=637264.0
you could just use the whitelisting function in gsm module
the cmd is
AT+CWHITELIST=mode,index,number
Parameters
0 Disable
1 Enable only call white list
2 Enable only SMS white list
3 Enable call and SMS white list
The index of phone number, scope: 1-30
Phone number to be set
example
AT+CWHITELIST=2,1,+9198xxxxxxx
I am having Issue while connecting ESP8266 with Arduino Mega. It always says "Module have no response."
Please check and correct me if I am wrong anywhere.
I am using below code and and wiring diagram is
My Code:
//#include <SoftwareSerial.h>
//use mega Serial 2 for serial monitor; Serial 1 on pins 19 (RX) and 18 (TX);// Serial2 on pins 17 (RX) and 16 (TX), Serial3 on pins 15 (RX) and 14 (TX).
#define SSID "SopraSteria"
#define PASS "1234567890"
#define DST_IP "220.181.111.85" //baidu.com
//SoftwareSerial dbgSerial(10, 11); // RX, TX
void setup()
{
// Open serial communications and wait for port to open:
//serial 2 is to esp8266
Serial2.begin(9600);//9600 (mine), 57600, 115200
Serial2.setTimeout(2000);
//serial 0 is to usb
Serial.begin(115200);
while(!Serial);
while(!Serial2);
//dbgSerial.begin(9600); //can't be faster than 19200 for softserial
//dbgSerial.println("ESP8266 Demo");
Serial.println("ESP8266 Demo on Mega2560");
while(Serial2.available()>0)
Serial2.read();
delay(1000);
//test if the module is ready
Serial2.println("AT+RST");
//delay(1000);
//delay(1000);
Serial.println("Resetting module");
Serial2.flush();
//if(Serial2.find("ready"))
if(Serial2.find("Ready")||Serial2.find("ready"))
{
//dbgSerial.println("Module is ready");
Serial.println("Module is ready");
}
else
{
//dbgSerial.println("Module have no response.");
Serial.println("Module have no response.");
//while(1);
}
delay(1000);
//connect to the wifi
boolean connected=false;
for(int i=0;i<5;i++)
{
if(connectWiFi())
{
connected = true;
break;
}
}
if (!connected){
//while(1);
Serial.println("Not Connected.");
}
delay(1000);
//print the ip addr
Serial2.println("AT+CIFSR");
Serial.println("ip address:");
while (Serial2.available())
Serial.write(Serial2.read());
//set the single connection mode
Serial2.println("AT+CIPMUX=0");
}
void loop()
{
//connectWiFi();
String cmd = "AT+CIPSTART=\"TCP\",\"";
cmd += DST_IP;
cmd += "\",80";
Serial2.println(cmd);
Serial.println(cmd);
Serial.println(cmd);
if(Serial2.find("Error")) return;
cmd = "GET / HTTP/1.0\r\n\r\n";
Serial2.print("AT+CIPSEND=");
Serial2.println(cmd.length());
if(Serial2.find(">"))
{
//dbgSerial.print(">");
Serial.print(">");
}else
{
Serial2.println("AT+CIPCLOSE");
//dbgSerial.println("connect timeout");
Serial.println("connect timeout");
delay(1000);
return;
}
Serial2.print(cmd);
delay(2000);
//Serial.find("+IPD");
while (Serial2.available())
{
char c = Serial2.read();
//dbgSerial.write(c);
Serial.write(c);
//if(c=='\r') dbgSerial.print('\n');
if(c=='\r') Serial.print('\n');
}
//dbgSerial.println("====");
Serial.println("====");
delay(1000);
}
boolean connectWiFi()
{
Serial2.println("AT+CWMODE=1");
String cmd="AT+CWJAP=\"";
cmd+=SSID;
cmd+="\",\"";
cmd+=PASS;
cmd+="\"";
//dbgSerial.println(cmd);
Serial2.println(cmd);
Serial.println(cmd);
delay(2000);
if(Serial2.find("OK"))
{
//dbgSerial.println("OK, Connected to WiFi.");
Serial.println("OK, Connected to WiFi.");
return true;
}else
{
//dbgSerial.println("Can not connect to the WiFi.");
Serial.println("Can not connect to the WiFi.");
return false;
}
}
From the schema I can see, that device uses 3V logic (I guess it from tension divider)? In that case if you communicate with 5V logic, then you should use 5v/3v buffers on Tx and Rx. This is my guess and my advice:
Always debug communication problems with oscilloscope.
Without this you simply cannot know what is happening.
Also make some other debugging. You assume, that device responds with ready or Ready, but try to print this out, what it actually really gave on output. Otherwise it's impossible for us to debug your piece of hardware without your hardware in the hands.
Also please make a note, that this is not appropriate forum for this kind of questions as there is https://arduino.stackexchange.com/.
Sorry #DawidPi thats not completly correct.
Yes it´s right thats not opimal to do it with a voltage divider. But this is not the problem. To solve the problem with the 3.3 TX will work (surely at 9600 baud --> I did it already like this)
Your problem is the power of your Arduino board. The ESP needs much current. Your board will not support this high current. You have to supply your ESP wih an external supply. I can recommend a fix voltage regulator like the LF33CV. Youse it with two condensators and it will work :-)
Wiring like here: .
If you use a LF33CV your UE should be between 4.3 and 40V. For testing I used the 5V of my USB-port. That will also work.
Try starting your ESP like this:
#define pin_reset 2 //Connect to RST pin of ESP8266
bool start()
{
pinMode(PinReset, OUTPUT);
delay(1);
pinMode(PinReset, INPUT);
delay(1000);
if (Serial.find("Ready"))
{
delay(1000);
return true;
}
else
{
return false;
}
}
#include <SoftwareSerial.h>
char inchar; //Will hold the incoming character from the serial port.
SoftwareSerial cell(2,3); //Create a 'fake' serial port. Pin 2 is the Rx pin, pin 3 is the Tx pin.
int led1 = A2;
void setup()
{
// Prepare the digital output pins
pinMode(led1, OUTPUT);
digitalWrite(led1, HIGH);
//Initialize GSM module serial port for communication.
cell.begin(19200);
delay(30000); // Give time for GSM module to register on network, etc.
cell.println("AT+CMGF=1"); // Set SMS mode to text
delay(200);
cell.println("AT+CNMI=3,3,0,0"); // Set module to send SMS data to serial out upon receipt
delay(200);
}
void loop()
{
//If a character comes in from the cellular module...
if(cell.available() >0)
{
delay(10);
inchar=cell.read();
if (inchar=='a')
{
delay(10);
inchar=cell.read();
if (inchar=='0')
{
digitalWrite(led1, LOW);
}
else if (inchar=='1')
{
digitalWrite(led1, HIGH);
}
delay(10);
delay(10);
}
cell.println("AT+CMGD=1,4"); // Delete all SMS
}
}
This is the code for receiving SMSes from the cellular network. I am using the Arduino Gboard with SIM900. There is no error in the code, but the LED on the board doesn't switch on or off in response to an SMS.
Why?
Here's a fully functional code for sending a command thru SMS using Arduino and GSM, it will also reply the state of the light.
#include <SoftwareSerial.h>
SoftwareSerial GPRS(10, 11);
String textMessage;
String lampState;
const int relay = 12; //If you're using a relay to switch, if not reverse all HIGH and LOW on the code
void setup() {
pinMode(relay, OUTPUT);
digitalWrite(relay, HIGH); // The current state of the light is ON
Serial.begin(9600);
GPRS.begin(9600);
delay(5000);
Serial.print("GPRS ready...\r\n");
GPRS.print("AT+CMGF=1\r\n");
delay(1000);
GPRS.print("AT+CNMI=2,2,0,0,0\r\n");
delay(1000);
}
void loop(){
if(GPRS.available()>0){
textMessage = GPRS.readString();
Serial.print(textMessage);
delay(10);
}
if(textMessage.indexOf("ON")>=0){ //If you sent "ON" the lights will turn on
// Turn on relay and save current state
digitalWrite(relay, HIGH);
lampState = "ON";
Serial.println("Lamp set to ON\r\n");
textMessage = "";
GPRS.println("AT+CMGS=\"+631234567890\""); // RECEIVER: change the phone number here with international code
delay(500);
GPRS.print("Lamp was finally switched ON.\r");
GPRS.write( 0x1a );
delay(1000);
}
if(textMessage.indexOf("OFF")>=0){
// Turn off relay and save current state
digitalWrite(relay, LOW);
lampState = "OFF";
Serial.println("Lamp set to OFF\r\n");
textMessage = "";
GPRS.println("AT+CMGS=\"+631234567890\""); /// RECEIVER: change the phone number here with international code
delay(500);
GPRS.print("Lamp was finally switched OFF.\r");
GPRS.write( 0x1a );
delay(1000);
}
if(textMessage.indexOf("STATUS")>=0){
String message = "Lamp is " + lampState;
GPRS.print("AT+CMGF=1");
delay(1000);
Serial.println("Lamp state resquest");
textMessage = "";
GPRS.println("AT+CMGS=\"+631234567890\""); // RECEIVER: change the phone number here with international code
delay(500);
GPRS.print("Lamp is currently ");
GPRS.println(lampState ? "ON" : "OFF"); // This is to show if the light is currently switched on or off
GPRS.write( 0x1a );
delay(1000);
}
}
Change
AT+CNMI=3,3,0,0
to:
AT+CNMI=2,2,0,0,0
The simplest way is the best way.
// if You use SoftwareSerial lib, declare object for GSM
SoftwareSerial gsm(8,9); // TX, RX
void setup(){
// initialise UART and GSM communication between Arduino and modem
Serial.begin(115200);
gsm.begin(115200);
// wait 5-10sec. for modem whitch must connect to the network
delay(5000);
// configure modem - remember! modem didn't remeber Your's configuration!
gsm.print("at+cmgf=1\r"); // use full functionality (calls, sms, gprs) - see app note
gsm.print("at+clip=1\r"); // enable presentation number
gsm.print("at+cscs=\"GSM\"\r"); // configure sms as standard text messages
gsm.print("at+cnmi=1,2,0,0,0\r"); // show received sms and store in sim (probobly, I don't compre this settings with app note but it's working :)
}
void loop(){
String response = gsmAnswer();
if(response.indexOf("+CMT:") > 0 ) { // SMS arrived
// Now You can parse Your Message, if You wont controll only LED, just write
if(response.indexOf("LED ON") > 0) {
digitalWrite(LED_PIN, HIGH); // enable it
}else if(response.indexOf("LED OFF") > 0) {
digitalWrite(LED_PIN, LOW); // turn off
}
delay(1000);
}
}
String gsmAnswer(){
String answer;
while(!gsm.available());
while(gsm.available()){
delay(5);
if(Serial.available() > 0){
char s = (char)gsm.read();
answer += s;
}
}
return answer;
}
One think more, incomming sms has the following format:
+CMT: "+48xxxxxxxxx","","17/07/07,21:57:04+08"
Test of arrived messages
You should first know exactly what the response is before attempting to parse it.
Try something simple like the following code (note: untested!) to get a feeling of what you should look for:
void loop() {
if(cell.available() > 0) {
char ch = cell.read();
Serial.print(ch);
}
}
My guess is you'll see more than just a '0' or a '1' :)
void loop() {
while(cell.available() > 0) {inchar = cell.read(); readString+=c;delay(1);} ///can be a delay up to (10) so you can get a clear reading
Serial.print(readString); /// Declare a string " String readString; "
for (i=0; i<200; i++){ /// Serch for the txt you sent up to (200) times it depends how long your ""readString" is
if(readString.substring(i,i+4)=="RING"){ //// I am looking for the word RING sent from my phone
digitalWrite(13,HIGH);
break;
}
}
}
this will help you find the specific word ir your reading (text message)