Connect Arduino Uno to SIM 7070G

Projects Networking, Protocols, and Devices
1

Hello Guys, i am new here and registered in this forum to ask for help.
I bought an SIM 7070G from Waveshare and an Arduino Uno (Original). I am not able to connect them to get simple At commands through serial monitors done and also cant use any codes to power a simple led.
I wired D10 as Tx to Rxd on the gsm and D11 as Rx to Txd. I connected ground between them.
I can communicate with the GSM through putty that works finde. I just got it working 1 time but after taking it on and of from power it wont work.
I hope i finde some help

2

I power the Arduino through my pc and die SMs7070G ist connected to a 5v power supply with 2A output

3

Perhaps if you read the pinned post 'How to get the most from the forum' you will be in a better position to post the information needed by the helpers to look at your problem. Last I checked none of us is a mind reader.

4 
#include <SoftwareSerial.h>

SoftwareSerial simSerial(8, 9); // RX = D9, TX = D8

void setup() {
  Serial.begin(9600);           // Für Monitor
  simSerial.begin(9600);      // SIM7070G Standard-Baudrate

  delay(2000);
  Serial.println("🟢 Teste SIM7070G...");
  simSerial.println("AT");
}

void loop() {
  if (simSerial.available()) {
    Serial.write(simSerial.read());
  }

  if (Serial.available()) {
    simSerial.write(Serial.read());
  }
}

This is the code i am using to get a simple ok from the at command but i dont get any answers from the sim7070g

5

But in your code you used a pins 8 & 9

6

Sorry that was just for testing other pins. I changed the pins and then the wires.
I got some comunication with the gsm. If i boot it ther serial monitor shows rdy
RDY
+CFUN: 1
+CPIN: READY
SMS Ready
then i can send 1 or maybe 2 times AT. And the Answer is ok. Then no more answers no matter wich at command

7

What does the documentation say? Perhaps the device is waiting for some other command that you are not sending.

8

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