![]() ![]() You need to add a semicolon ( ) after this command. This means the GSM Module is communicating with Arduino. If you send this, the GSM Module will reply ‘OK’. You can refer the AT Commands datasheet for various AT Commands. But we will see few AT commands in this tutorial. Gsm.println(tempSerial) //Send the Serial Monitor Strings(AT Commands) to GSM.īy using the serial monitor, we send AT Commands to the GSM Module to perform various functions. TempSerial = Serial.readString() //Read from Serial Monitor and store it in this variable. Write to GSM from user given Serial Monitor Inputs(AT Commands) Serial.println(tempGSM) //Print the string from GSM to Serial Monitor. TempGSM = gsm.readString() // Read from GSM and Store it in this variable. Read from GSM and Print on Serial Monitor Serial.begin(9600) //Set Serial Monitor Baudrate SoftwareSerial gsm(10, 11) // RX, TX of Arduino Similarly, it sends the user entered string from Serial Monitor to the GSM Module. The following code will read the GSM data via Software Serial and print it on Serial Monitor. Simple Code to send AT Commands and display data from GSM Module on Serial Monitor: Because a 3.3v from SIM800L can be able to handle by a 5V Arduino Pin (TX) (probably a lesser voltage, but it takes even a 2.7v as a high signal).Īlternatively, you can use this Bi-Directional Level Shifter. We only need a voltage divider at the RX Pin of SIM800L. Note: For long time use a voltage divider is recommended as the TX & RX Pins of SIM800L is 3.3V Logic level. Similarly for the transmitter side, when some data is sent, the other should receive it to make use of it. In simple logic, a receiver can receive some data only if it is transmitted from somewhere. Similarly, the TX Pin of SIM800L should connect to RX Pin of Arduino. The RX Pin of SIM800L Module Should connects to TX Pin of the Arduino. As we know the SIM800L accepts 3.6V – 4.4V and 2Amps, the SIM800L module can draw much current as needed from the LM2596 with a fixed voltage. You can use a Multi-meter to check the voltage (or) you can use the LM2596 Module with Display. TXD – Transmitter from the module (To be connected to Arduino RX Pin).īefore making connections, make sure the LM2596 output is set to 4.4V by adjusting the potentiometer on the LM2596 module. RXD – Receiver to the module – 3.3V Logic (To be connected to Arduino TX Pin. (LM2596 with a 9/12V 1Amp adapter input and it should be adjusted to 4.2V recommended). VCC – Power supply 3.4V to 4.4V with min 2 Amp. You can use an external antenna via an uFL Connector available on the module for a better signal reception. NET – Antenna pin for the module (Spring Type included). We will be using 5 Pins to connect with Arduino for basic operation. In this tutorial, we will see how to use SIM800L GSM module with an Arduino.Īt the backside of the module, you can find the pin details printed on it. Note: The SIM800L accepts only 2G (No 4G)
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