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LilyGo logo

🌟LilyGo T3 TCXO SX1276🌟

Overview

  • This page introduces the hardware parameters related to LilyGo T3 TCXO SX1276

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

Product

Product SOC Flash PSRAM
T-3 TCXO ESP32-PICO-D4 4MB(Quad-SPI) ❌

PlatformIO Quick Start

  1. Install the CH9102 USB bridge driver for the first time.
  2. Install Visual Studio Code and Python
  3. Search for the PlatformIO plugin in the Visual Studio Code extension and install it.
  4. After the installation is complete, you need to restart Visual Studio Code
  5. After restarting Visual Studio Code, select File in the upper left corner of Visual Studio Code -> Open Folder -> select the LilyGo-LoRa-Series directory
  6. Wait for the installation of third-party dependent libraries to complete
  7. Click on the platformio.ini file, and in the platformio column
  8. Select the board name you want to use in default_envs and uncomment it.
  9. 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.
  10. Click the (✔) symbol in the lower left corner to compile
  11. Connect the board to the computer USB-C , Micro-USB is used for module firmware upgrade
  12. Click (→) to upload firmware
  13. Click (plug symbol) to monitor serial output
  14. If it cannot be written, or the USB device keeps flashing, please check the FAQ below

Arduino IDE quick start

  1. Install the CH9102 USB bridge driver for the first time.

  2. Install Arduino IDE

  3. Install Arduino ESP32

  4. 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

  5. Open the corresponding example

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

  6. 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 ESP32 Dev Module
    Port Your port
    CPU Frequency 240MHZ(WiFi/BT)
    Core Debug Level None
    Erase All Flash Before Sketch Upload Disable
    Events Run On Core1
    Flash Frequency 80MHZ
    Flash Mode QIO
    Flash Size 4MB(32Mb)
    JTAG Adapter Disabled
    Arduino Runs On Core1
    Partition Scheme Huge APP (3MB No OTA/1MB SPIFFS)
    PSRAM Enable
    Upload Speed 921600
    Programmer Esptool

  7. Please uncomment the utilities.h file of each sketch according to your board model ,e.g T3_V3_0_SX1276_TCXO, otherwise the compilation will report an error.

  8. Upload sketch

📍 Pins Map

Name GPIO NUM Free
OLED(SSD1306) SDA 21 ❌
OLED(SSD1306) SCL 22 ❌
SD CS 13 ❌
SD MOSI 15 ❌
SD MISO 2 ❌
SD SCK 14 ❌
LoRa(SX1276) SCK 5 ❌
LoRa(SX1276) MISO 19 ❌
LoRa(SX1276) MOSI 27 ❌
LoRa(SX1276) RESET 23 ❌
LoRa(SX1276) DIO1 26 ❌
LoRa(SX1276) DIO2 32 ❌
LoRa(SX1276) CS 7 ❌
LoRa(SX1276) TCXO EN 12 ❌
Battery ADC 35 ❌
On Board LED 25 ❌
  • The GPIOs above GPIO33 of the ESP32 chip only allow input functions and cannot be set as output functions.
  • You need to remove the SD card when uploading the sketch, otherwise it will not be downloaded
  • TCXO EN must be set to high before initializing the Radio

🧑🏼‍🔧 I2C Devices Address

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

⚡ Electrical parameters

Features Details
🔗USB-C Input Voltage 5V
⚡Charge Current 500mA
🔋Battery Voltage 3.7V

Button Description

Channel Peripherals
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 GPIO25, and the LED is turned on or off by writing a high or low level

RF parameters

Features Details
RF Module SX1276
Frequency range 840～945MHz
Transfer rate(LoRa) 0.018K～37.5Kbps
Transfer rate(FSK) 1.2K～300Kbps
Modulation FSK, GFSK, MSK, GMSK, LoRa，OOK

Important

When the bandwidth is lower than 62.5kHz, LoRa modules using non-TCXOs will not be able to fully communicate, resulting in poor communication quality. Modules equipped with TCXOs do not experience this issue.

Resource