@caz Of course all is ok regarding UART communication...I canuse the GPS mode, the GPRS mode, wifi...AT commands , send and receive SMS..but unable to read and write to the SD card
Regards
Papbo

See https://community.lilygo.cc/topic/30/can-t-download-firmware-on-sim7600g-most-of-the-time for detail.

Hello everyone,
I could run using Waveshare lib!!
Thank you so much!!

@yakuzja There are two ways to get started quickly

Use the Arduino IDE and install the ESP32 support package. Use the VSCODE PIO plug-in, this plug-in can automatically configure the environment for you, the compilation speed is relatively fast, and it also supports Arduino functions and libraries

Yes, crystal burrs cause the problem.It has now been fixed in the latest version

@errolt
https://github.com/LilyGO/TTGO-ESP8266-0.91-SSD1306/blob/master/t12_8266_v1.3.pdf
The schematic is here

@caz that's great , if you have any other questions in use, please feel free to contact us.

@Customer-Support Hey would you please help me out with my post? I have posted in Technical Support about the LilyGo Tcall SIM800L 🙂

@Lilygo Hey could you please respond to my problem in thetechnical discussion page about location problems on the LilyGo T-Call SIM800?

@marmou Good job. You are awesome👍

@lilygo Thank you. I successfully build, download and run all example sketches.

Hello @dabee , Is the new battery suitable for the product ? If still have any other questions, please contact us without hesitation .

@joter Sorry. T3 is not using Espressif driver, but using ch9102 driver chip. I now send you the driver link of win10

http://www.wch.cn/downloads/CH343SER_EXE.html

0b6bf207-3746-403c-a322-dca07aa08b80-image.png

The role of the blue font is to download

Hello, the code has been fixed. The ESP32 Pico option is available.

@ckuehnel ![alt text]![0_1630891882486_IMG_4333.JPG]
Hello, this is the battery wiring method for the extended backplate.The battery type is 3.7V lithium.
(Uploading 100%)

0248c48c-7c32-4a8f-a27f-0bd4c68d0d62-image.png

I don't quite understand what you mean, is it that ESP32 uses BLE to communicate with the mobile APP? If yes, this will involve communication protocol issues

reference

Currently T-Watch does not have this function, we will refer to your opinions so that we will create new products that can meet this requirement in the future.

@mohir https://www.arduino.cc/en/Tutorial/HomePage
This is the official tutorial site about Arduino

https://github.com/Xinyuan-LilyGO/LilyGo-T-Display-S2
This is the GitHub demo code about T-DISPLAY-S2