@blyshchak

Just saw your message, a buddy of mine has a T-Beam, not sure what frequencies his operates at, so I will get my hands on it and take a look.

@blyshchak

How far into the trouble shooting are you, and what exactly is not working ? Also can you post a slim piece of code that shows what is not working ?

Little update.

I am able to receive the initialization message from the SIM7600 board, so at least I know that the hardware serial read works :

RDY

+CPIN: READY

SMS DONE

PB DONE

If anyone has this issue, you can just do a read in the main loop....

  String response = "";

  while (SIMCOM.available()) {
     char c = SIMCOM.read();
     response += c;
  }
  Serial.print(response);

and then power cycle the SIM7600 with The T-Display-S3 connected

Still a mystery as to what is going on

@roblatour

Very nice, I'm curious about the battery charging ??? Is the T-Display charging the battery while it's connected via USB ???

I'm building out a project with the T-Display-S3 myself but I'm going to use 2 18650 batteries, with this charger module Charger Module I'm also curious on the power usage and battery life on the T-Display-S3.

@teastain2

Thanks for the heads up Terry, I just had my T-Display-S3 Touch delivered on Friday, I will be jumping on it very soon, I need to resolve an issue with the none touch unit....I posted that topic tonight.

Thank you again.

@bumptop

It seems like we are working in the same space, albeit different objectives... I just posted this T-Display-S3 UART communication issue so I"m happy to hear that you got further than me.

Would you mind either looking at my posted code to see where I made a mistake or perhaps post the code you are using to even get an OK from the SIMCOM unit.

I'm also curious what Lilygo product you are using ?

Thank you in advance.

@roblatour

Cool beans...looks like a cool project/device for those who have YouTube accounts, nice job.

@crupp

Have you taken a look at the Serial Example from the Github repo ?

I have this device : SIM7600G-H, that I know works because I started my initial tests on the Arduino UNO, and I was able to get an "OK" from a basic status check ("AT" command), I could send SMS, make a call...everything on the UNO is working great.

Moving over to the T-Display-S3, I can't get anything out of the unit, not even an "OK", I trimmed the code down to the basic instructions that should work.

I have tried the Serial Example, posted in the Github repo, and that works, so I can see the data I enter into the Serial Monitor to pass through the ports, so I would think everything is okay, but then why would it not work on the T-Display S3, but work on the Arduino UNO ???

I tried other ports 21, and 16, as shown in the Github repo example, and that didn't work...Running out of ideas here, if anyone has had issues implementing a Hardware Serial build please let me know.

Thank You.

#define RX_PIN 18
#define TX_PIN 17

#define SIMCOM Serial1

const long int SIMCOM_BITRATE = 115200;

void setup() {

  Serial.begin(115200);
  
  while (!Serial) {
    ; 
  }
  delay(3000);

  SIMCOM.begin(SIMCOM_BITRATE, SERIAL_8N1, RX_PIN, TX_PIN);
  while (!SIMCOM) {
    ; 
  }  
  delay(3000);

}

void loop() {

  char message[] = "AT";

  SIMCOM.write(message);

  Serial.println(message);

  delay(100);

  long int time = millis();

  int timeout = 5000;
  
  int x = 0;
  char response[128];

  do {

    if (SIMCOM.available() != 0 ) {
        response[x] = SIMCOM.read();
        x++;
    }

  } while ((time + timeout) > millis());

  Serial.println("Timed out..." + String(x));

  Serial.print("Response : ");
  Serial.println(response);
  Serial.println();

}

Hi Stefan, I was curious if you using the SPI port had any interference with the touch functionality.

I noticed that in the pinout the SPI pins 10-13 are also connected to some of the touch pins ?

I'm still waiting on my device to arrive but I hope there is no issue there.

Thank you.