Sim800 gsm module

Hardware Arduino GSM Shield
1

I bought the following Sim800L GSM module. The module is calling and sending messages, but I can not control arduino by sending messages. In addition, the module does not respond to AT commands. Can anyone with experience in this matter help me?

#include <SoftwareSerial.h>
SoftwareSerial GPRS(7, 8); // RX, TX

void setup()
{
  GPRS.begin(9600);
  Serial.begin(9600);
}

void loop()
{
  while(GPRS.available()) 
    Serial.write(GPRS.read());

  while (Serial.available()) 
      GPRS.write(Serial.read());
}

I use this code. I am using a 2A 15V power supply and LM2596 DC-DC.
The circuit diagram is as follows.

indir.jpg

ss.png
ss.png743×539 90.8 KB

2

Hello, you should connect pin 7(rx) to sim800L tx, and pin 8(tx) to sim800L rx for communicate with sim800 via serial from PC serial monitor

3

First of all thank you for your interest but it did not work again.

4

See this post:

Seems that is the same as you want