Lilygo TTGO T-BEAM not Connect, a wifi network show up

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Hi, i just bought a couple of Lilygo TTGO T-Beam boards, and i don’t know if there are ok. When i Connect the boards to USB (Ubuntu Linux with Arduino) no leds are on, but both boards creates a wifi Network secured called SoftRf-xxxx but i don’t know what to do with them. USB not recognize nothing (i upload my sketchs to arduino uno and nano boards without problem).

A video that show the problem. No leds are on.
Please sorry muy bad english.

Thanks everyone!

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You got the current T-Beam V1.0 version. This board does have LED only for charging and GPS pps signal.

First take out the 18650 battery. Then connect by USB to your PC. You should now be able to reflash the board, regardless in what state it was before. The USB circuitry on the board is powered by VBUS of USB port.

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Hi, thanks for reply!
Really, i prefer no leds, i want low consumption. My problem is that i can’t upload any sketch. Is my first ESP32 board, i only have experience with Arduino. My Ubuntu seems not detect board… Perhaps the problem os only mine. Anyone can tell me a link to follow a guide to connect boards as these one?

Thanks again!

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For TTGO T-Beam v1.0 you need upload tool which toggles ESP32 boot mode via RTS/DTR serial line, since the board has no “PROG” button.

Use esptool.py.

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WiFi PSK key is: 12345678

Quick start
Flashing instructions (Windows)
Esptool (Linux)

$ dmesg
< … skipped .. >
[11496012.504731] usb 1-1.2.1: new full-speed USB device number 119 using dwc_otg
[11496012.639765] usb 1-1.2.1: New USB device found, idVendor=10c4, idProduct=ea60
[11496012.639783] usb 1-1.2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[11496012.639795] usb 1-1.2.1: Product: CP2104 USB to UART Bridge Controller
[11496012.639805] usb 1-1.2.1: Manufacturer: Silicon Labs
[11496012.639815] usb 1-1.2.1: SerialNumber: 01C00C03
[11496012.647834] cp210x 1-1.2.1:1.0: cp210x converter detected
[11496012.650444] usb 1-1.2.1: cp210x converter now attached to ttyUSB0
$ lsusb
< … skipped .. >
Bus 001 Device 119: ID 10c4:ea60 Cygnal Integrated Products, Inc. CP210x UART Bridge / myAVR mySmartUSB light
< … skipped … >
$ ls -l /dev/ttyUSB0
crw-rw---- 1 root dialout 188, 0 Sep 22 16:01 /dev/ttyUSB0
$
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Sorry but i still understand… Arduino has esptool.py integrated after espressif cards are installed. I installed cp210x drivers and choose T-Beam board in Arduino plattform, and tried different uploading speeds, but esptool not detect the board after plug it to usb.

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  • Take out battery AND disconnect USB plug.
  • Make sure you’re using USB cable with all wires connected (i.e. not a USB power cable)
  • Make sure appropriate CP2104 USB driver is installed on host system
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Ooooh thanks… damn!! it was the cable, i’m soooo stupid…
many many thanks!!!

1 Like
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Only last thing, please…
After upload TTN Tbeam sketch:


I only see “No gpx fix in serial monitor”, after 30 minutes out of house, still no fixing.
¿Is needed any modification on this sketch for that board? I choose “T-Beam” Board in Arduino IDE…
Many thanks again.

Gps works, because this sketch works perfectly, but TTNMapper not…

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Okkk, almost solved, i modified sketch to send packet even without gps signal and payload finally arrived to my TTN account, so i only need to solve gps fix problem of gps.h and gps.cpp files.

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Finally Solved, GPS pins really are:
#define GPS_TX 34
#define GPS_RX 12