@garaving No problem, I only speak ONE language!
Unfortunately I'm not an 7670e expert. It does not look like there is a BT5 version with S3.
LilyGO is using S3 exclusively now, so I am surprised.
There are so many versions and their website is not clear.
I'm sorry I could not be of more help.
Here is there technical GitHub repository:
https://github.com/Xinyuan-LilyGO/LilyGo-T-PCIE
-Terry

@emc Sure, I2C works fine with these boards.
Can you post your sketch?
You can use the little 4 pin socket with any SparkFun qwiic or Adafruit Stemms qt sensors.
Otherwise what pins are you using?
The GPS module (GT-U7) does not seem to be I2C, tho'.
Maybe post both of the data sheets?
-Terry

@djmason mine died pretty fast as well.

The Lilygo folks were resistant to replacing it, but they offered to send a replacement screen or a discount on a 2nd one. I considered that a fair move.

The problem is solved.
When operating in battery mode, you must not forget
// disable brownout detector allows you to turn on the simcom module without interrupting the power supply
WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 0);
because the voltage across the battery drops by 1.5 V which causes a “Brownout detector was triggered” and therefore a reset.
The inrush current when starting the A7608 is around 2A. It might be necessary to add decoupling capacitors on the card. I have the impression that some are planned but not welded.

@jourdant Not only swapping A/B wires but also remember that the LilyGO boards TX is the Modbus device's RX !

@tiak See here!
https://github.com/Xinyuan-LilyGO/T-CAN485
The empty header next to the Power In socket has GPIO and so could be setup in your sketch as Standard Speed bit-banged SPI.
You should pour over the pages of the Espressif documents for your ESP32 and see it any of them are High-Speed, etc
-Terry

@crisant Right away I don't recommend the blank Arduino IDE "New Sketch" without something for it to do, such as a delay(100);.
People have found that they cannot connect afterwards because of the short scan time not allowing any other activity!
I made this sketch to test that the board is working by printing to the serial port:

//words preceded by "//"" are comments and are not executed bool ticktock; //declare ticktock as a boolean flag void setup() { //runs once on start up Serial.begin (115200); //open the serial port for USB cable } void loop() { //runs in circles! ticktock = !ticktock; //every pass through reverse the flag if (ticktock) { //test current value of the ticktock flag Serial.println("tick"); } else { //prints one or the other to the USB port Serial.println("tock"); } delay (1000); //wait for a second and run again! }

I went to their GitHub repository for uploading instructions and they are different than a normal ESP32
https://github.com/LilyGO/ESP32-Paxcounter#uploading
so try following their ESP32 with LORA instructions

Also when you pull down the board type menu in Arduino IDE where you select your board type, there is also the available ports.
Check to see that the USBmodem is stable.
Sometimes when I get the Failed Uploading error I have to reboot my computer. This has been a "bug" I have faced for years.
-Terry

FYI, I'm finding this, https://www.nxp.com/docs/en/user-guide/JN-UG-3115.pdf, quite a useful reference. For example see chapter 18 on an example of sychronising time by querying an attribute.

OK, can now confirm that an ESP32-C3 project built using the Espressif esp-idf framework can be uploaded to the T-ZigBee board. You will need to use the latest esptool (now a PyPi package) to ensure that the chip can be set to esp32c3.

@patofoto Well, it took months and months but finally some guys over on the GitHub for ESP-Arduino finally found it!
https://github.com/espressif/arduino-esp32/issues/8324#issuecomment-1725784617
The helper util file in the onewire lib had an outdated notion that there could not possibly be pins greater that 33.
I edited mine and now it works!
Wow, what a ride!
-Terry

@teastain2 OK, so I made this as a starter for you, but I cannot do the entire project!
Give me your email address and I will send you the program.
-Terry

@kaly__ I tried this yesterday to pretty good results using an IPEX1 connector and a small antenna, no board modifications. Went from no connection to ~-75dB in my downstairs workshop.

https://www.amazon.com/gp/product/B08VSJPY7V

@teastain2 Thanks for the hint !
This is exactly what I was looking for and worked perfectly.