@v12cat LilyGO believe that this community site is off line:
"As our forums are under maintenance, if you have a question about a product, please post the appropriate thread on our GitHub."
on their main web page:
https://www.lilygo.cc/products
It is just me (!) and a few other users manning this site.
You can try raining an #Issue on their GitHub and maybe lewis he will read it?

May I ask what does the Panel do, with two ESP32s ?
How do you program each one?
BTW both the sales page and the GitHub examples say that it has touch. the keyword to look for in the sketch is CST, this is their touch chip.
-Terry

@teastain2 Thank you very much! I'll check it out. I appreciate it.

@teastain2 Thank you

@mijail-makaroff-0 They can be used as GPIO and therefore interrupts.
The old Arduino boards had dedicated I/O, but ESP32 uses a 'GPIO multiplexer'.
-Terry

@hpro This only a community site, with mostly me.
You could try their GitHub repository and raise an issue:
https://github.com/Xinyuan-LilyGO/T-Display-S3/issues
Lithium batteries do not lose voltage as they are used up, They all of a sudden die!
My suggestion was to calibrate the voltage at USB conditions and anything less than that, accounting for ADC drift would indicate that it was on battery only, no USB.
-Terry

Hi! I am encountering the same issue! I have replaced the # defined for the modem from TINY_GSM_MODEM_A7670 to TINY_GSM_MODEM_SIM7600, which got the sketch to compile, but the modem doesn't get any GPS reading. This post is the number one result on Google, but sadly, there isn't much help here yet. As you've pointed out, I have a feeling it's a TinyGSM library issue, but I am kinda lost on debugging it from here. It'd be great if someone got the GPS working and found this post sometime in the future...

@franl What Arduino codes did you download and have trouble with?
I will try to help.

@wellco ..answering myself here, it may help others.

I now have the right output in the serial window. Many frustrating hours were spent trying to make it work. Somehow Tools\USB CDC On Boot: Enable, had reset to disabled. It took me a while to realise this.

Then (this is the vague bit) sometimes I need to click the RST, Boot and Power buttons in various sequences. This is what usually works if the serial monitor window is blank.

Press the RST button momentarily and wait for 20 seconds. If window is still blank .. Press the power button and hold for 6 secs. Release and press momentarily, wait for 20 seconds. If window is still blank .. Unplug the USB hold down the Boot down and plug the USB cable back in. Upload you sketch again. Hurl device against a solid wall with as much force as you can muster ☺

Joking apart; there is also another button sequence that might help and that's the documented one. Hold RST down, press and hold the Boot button. Release the RST button, and finally release the Boot button.

Hope this helps somebody..

Cheers Wellco

@ankurlaitkor Output screen

935694ee-5031-43a4-90a9-993122a1c0b5-image.png

int AXP20X_Class::shutdown() { uint8_t val; if (!_init) return AXP_NOT_INIT; _readByte(AXP202_OFF_CTL, 1, &val); val |= (1 << 7); _writeByte(AXP202_OFF_CTL, 1, &val); return AXP_PASS; }