i use this code to control four LEDs by SMS from mobile phone.
i use arduino uno
and GPRS Shield http://cytron.com.my/p-shield-gprs
the problem is that the code work properly from the serial monitor text but it is not work from mobile phone SMS.
and the code :
char inchar; //Will hold the incoming character from the Serial Port.
#include <SoftwareSerial.h>
SoftwareSerial SIM900(7, 8);
int led1 = 9;
int led2 = 10;
int led3 = 11;
int led4 = 12;
void setup()
{
// prepare the digital output pins
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
pinMode(led4, OUTPUT);
digitalWrite(led1, LOW);
digitalWrite(led2, LOW);
digitalWrite(led3, LOW);
digitalWrite(led4, LOW);
//Initialize GSM module serial port for communication.
Serial.begin(19200);
delay(3000); // give time for GSM module to register on network etc.
SIM900.print("AT+CMGF=1\r");// set SMS mode to text
delay(200);
SIM900.print("AT+CNMI=2,2,0,0,0\r"); // set module to send SMS data to serial out upon receipt
delay(200);
}
void loop()
{
//If #a1b1c1d1 comes as sms, all led's should light up.
if(Serial.available() >0)
{
inchar=Serial.read();
if (inchar=='#')
{
delay(10);
inchar=Serial.read();
//first led
if (inchar=='a')
{
delay(10);
inchar=Serial.read();
if (inchar=='0')
{
digitalWrite(led1, LOW);
}
else if (inchar=='1')
{
digitalWrite(led1, HIGH);
}
delay(10);
//Second led
inchar=Serial.read();
if (inchar=='b')
{
inchar=Serial.read();
if (inchar=='0')
{
digitalWrite(led2, LOW);
}
else if (inchar=='1')
{
digitalWrite(led2, HIGH);
}
delay(10);
// Third led
inchar=Serial.read();
if (inchar=='c')
{
inchar=Serial.read();
if (inchar=='0')
{
digitalWrite(led3, LOW);
}
else if (inchar=='1')
{
digitalWrite(led3, HIGH);
}
delay(10);
//Fourth led
inchar=Serial.read();
if (inchar=='d')
{
delay(10);
inchar=Serial.read();
if (inchar=='0')
{
digitalWrite(led4, LOW);
}
else if (inchar=='1')
{
digitalWrite(led4, HIGH);
}
delay(10);
}
}
Serial.println("AT+CMGD=1,4"); // delete all SMS
}
}
}
}
}
