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LilyGo logo

🌟LilyGo T3 S3 LR1121🌟

Overview

  • This page introduces the hardware parameters related to LilyGo T3 S3 LR1121

Notes on use

  1. This version does not have BMS, please use a lithium-ion battery with battery protection function
  2. Please be sure to connect the antenna before transmitting, otherwise it is easy to damage the RF module
  3. The T3-S3 V1.2 and T3-S3 V1.3 use the same pins; the only difference is the charging circuit.

Product

Product SOC Flash PSRAM
T3-S3 ESP32-S3FH4R2 4MB(Quad-SPI) 2MB(Quad-SPI)

PlatformIO Quick Start

  1. Install Visual Studio Code and Python
  2. Search for the PlatformIO plugin in the Visual Studio Code extension and install it.
  3. After the installation is complete, you need to restart Visual Studio Code
  4. After restarting Visual Studio Code, select File in the upper left corner of Visual Studio Code -> Open Folder -> select the LilyGo-LoRa-Series directory
  5. Wait for the installation of third-party dependent libraries to complete
  6. Click on the platformio.ini file, and in the platformio column
  7. Select the board name you want to use in default_envs and uncomment it.
  8. Uncomment one of the lines src_dir = xxxx to make sure only one line works , Please note the example comments, indicating what works and what does not.
  9. Click the (✔) symbol in the lower left corner to compile
  10. Connect the board to the computer USB-C , Micro-USB is used for module firmware upgrade
  11. Click (→) to upload firmware
  12. Click (plug symbol) to monitor serial output
  13. If it cannot be written, or the USB device keeps flashing, please check the FAQ below

Arduino IDE quick start

  1. Install Arduino IDE

  2. Install Arduino ESP32

  3. Copy all folders in the lib directory to the Sketchbook location directory. How to find the location of your own libraries, please see here

    • Windows: C:\Users\{username}\Documents\Arduino
    • macOS: /Users/{username}/Documents/Arduino
    • Linux: /home/{username}/Arduino

  4. Open the corresponding example

    • Open the downloaded LilyGo-LoRa-Series
    • Open examples
    • Select the sample file and open the file ending with ino

  5. On Arduino Select the corresponding board in the IDE tool project and click on the corresponding option in the list below to select

    Name Value
    Board LilyGo T3-S3
    Port Your port
    USB CDC On Boot Enable
    CPU Frequency 240MHZ(WiFi)
    Core Debug Level None
    USB DFU On Boot Disable
    Erase All Flash Before Sketch Upload Disable
    Events Run On Core1
    Arduino Runs On Core1
    USB Firmware MSC On Boot Disable
    Partition Scheme Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS)
    PSRAM QSPI PSRAM
    Board Revision* Radio-LR1121
    Upload Mode UART0/Hardware CDC
    Upload Speed 921600
    USB Mode CDC and JTAG
    Programmer Esptool
    • Board revision Select according to actual model

  6. Upload sketch

📍 Pins Map

Name GPIO NUM Free
(QWIIC) Uart1 TX 43(External QWIIC Socket) ✅️
(QWIIC) Uart1 RX 44(External QWIIC Socket) ✅️
QWIIC Socket IO10* 10(External QWIIC Socket) ✅️
QWIIC Socket IO21* 21(External QWIIC Socket) ✅️
SDA 18 ❌
SCL 17 ❌
OLED(SSD1306) SDA Share with I2C bus ❌
OLED(SSD1306) SCL Share with I2C bus ❌
SD CS 13 ❌
SD MOSI 11 ❌
SD MISO 2 ❌
SD SCK 14 ❌
LoRa(LR1121) SCK 5 ❌
LoRa(LR1121) MISO 3 ❌
LoRa(LR1121) MOSI 6 ❌
LoRa(LR1121) RESET 8 ❌
LoRa(LR1121) DIO9 36 ❌
LoRa(LR1121) BUSY 34 ❌
LoRa(LR1121) CS 7 ❌
Button1 (BOOT) 0 ❌
Battery ADC 1 ❌
On Board LED 37 ❌
  • You can use GPIO10,21 by removing the two resistors in the figure below. Otherwise, the GPIO is connected to DIO8,DIO7 of Radio by default.
  • SDA(18) and SCL(17) are not brought out and cannot be accessed. They can only be used as other GPIOs through QWIIC or header pins. During initialization, use explicit initialization Wire.begin(sda,scl); Any unused GPIO can be used as SDA and SCL.
T3 V1.2 T3 V1.3
T3-S3-QWIIC T3-S3-QWIIC

🧑🏼‍🔧 I2C Devices Address

Devices 7-Bit Address Share Bus
OLED Display SSD1306 0x3C ✅️

⚡ Electrical parameters

Features Details
🔗USB-C Input Voltage 5V
🔗Solar Input Voltage(T3 V1.3 Only) 4.5~5.6V
⚡Charge Current 500mA
🔋Battery Voltage 3.7V
🔋Battery Socket Cables PH2.0mm
🔗QWIIC Socket Cables JST1.0
VBUS Pin 5V
VBAT Pin 4.2V

Important

T3 V1.3 The maximum solar input voltage can only be 5.6V. If the voltage exceeds this, the Zener diode will discharge and cause the diode to heat up.T3 V1.3

VBUS pin and USB-C port share the same circuit. Please ensure that you do not connect different voltages to the USB-C and VBUS pins, and that power is supplied from only one point.

VBAT pin and battery connector are on the same circuit. Please ensure that you do not connect different voltages to the battery connector and VBAT pin, and ensure that power is supplied from only one point.

If you need to use an external BMS to power the motherboard, the best approach is to connect it via the VBAT port. Note that the voltage connected should be the external BMS's battery voltage (maximum 4.2V). Because the onboard charging management cannot be disconnected, please ensure that the USB-C port is not connected simultaneously while the external BMS is charging; otherwise, both the onboard charging management and the external BMS will charge the battery at the same time.

Button Description

Channel Peripherals
BOOT Boot mode button, customizable
RST Reset button

LED Description

  • CHG LED
LED State Details
On Battery charging
Off Battery Full
Blink Battery not connected
  • User LED
  1. The LED is connected to ESP32 GPIO37, and the LED is turned on or off by writing a high or low level

RF parameters

Features Details
RF Module LR1121
Frequency range 400-520MHz/830-945MHz/2400-2500MHz
Transfer rate(LoRa Sub1G) 0.018 K ～ 62.5 Kbps
Transfer rate(FSK Sub1G) 0.6 K ～ 300 Kbps
Transfer rate(LoRa 2.4G) 0.476 K~101.5 Kbps
Modulation LoRa,FSK,LR-HFSS
  • LR1121 Sub-1G When the power setting is lower than 14, the power is abnormal. Please see here

WiFi-IPEX

  • The following figure shows how to switch the onboard WIFI antenna to IPEX
T3 V1.2 T3 V1.3
T3-S3 T3-S3

LoRa Ant

  • For instructions on how to configure LoRa antenna control, please refer to the example
  • LR1121 The 2.4G antenna interface is located on the LoRa module and cannot be changed.
  • LoRa 2.4G and Sub1G antennas are independent and cannot be shared.
  • The following figure shows how to switch the onboard LoRa-Sub1G SMA antenna to IPEX

LORA-IPEX

LR1121 RF Block Diagram

RF Block Diagram

Resource