If it blinks every 3 seconds, the module has made contact with the cellular network & can send/receive voice and SMS. If it is blinking every 1 second, it means that the module is running but hasn’t made a connection to the cellular network yet. You will notice that the SMS module is Blinking. Lastly, connect the GND to GND of Arduino.Īfter connecting the SMS module, plug your Arduino to your PC. In this tutorial, we won’t be using those and will directly connect our module to 5V.Ĭonnect the RX to Digital Pin 2 and TX to Digital Pin 3.
You can use a linear Voltage regulator like LM317 or LM388 or just use a Buck Converter to step down the voltage. Sim 800L recommended voltage is 3.4V to 4.4V but it can handle up to 5V of Arduino. This is a great project that you can integrate with your home automation or send sensor readings to your phone using SMS.Ĭonnect VCC pin to 5V.
SmsSerial.Today we will learn how to send and receive SMS with SIM800L GSM Module and Arduino. The only (temporary) drawback to the LimeSDR is that it doesnt have the same level of software support as the USRP. The LimeSDR even matches much of the USRPs B210 specs. SmsSerial.print("Warning!Intrusion") // Enter the alert message You could buy an Ettus USRP B200 or B210 for around 1,216, A bladeRF x40 for 420, or a LimeSDR for 299.LimeSDR is full-duplex, MIMO, and superior to BladeRF. SmsSerial.println("AT+CMGS=\"+91"+number+"\"") // Specify recipient's number in international format SmsSerial.println("AT+CMGF=1") // Set to Text Mode If (digitalRead(sense_pin)=LOW) // Check if the sense_pin sets off Sends an sms everytime sense_pin sets off String number ="0123456789" // Recipient's number - see textĭigitalWrite(sense_pin,HIGH) // Enable internal pull-upĭigitalWrite(status_pin,HIGH) // Enable status indicator if serial is available SoftwareSerial smsSerial(10,11) // RX and TX pins to communicate with GSM module SMS Trigger Input (Sense Pin) connected to D9 (Active LOW) - see text #include Connect the RXD pin of the GSM module to D11 * /Connect TXD pin of the GSM module to D10 * Hardware: Arduino Nano V3 & SIM800L GSM Module So simply use this sketch, after changing the recipient’s phone number to the one you want to send the alert message to. Here, the communication between Arduino and SIM800L goes over a SoftwareSerial, and uses standard AT commands. There are so many featured Arduino Libraries (for example, the one from Cristian Steib - you can try but the sketch included here ,without any such exceptional libraries, will work fine for this application.
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