1. Install [Visual Studio Code](https://code.visualstudio.com/) and [Python](https://www.python.org/)
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
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](https://support.arduino.cc/hc/en-us/articles/4415103213714-Find-sketches-libraries-board-cores-and-other-files-on-your-computer)
* 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 V1.3 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
1. When the module turns on PA (transmit) / LNA (receive) data, the module's RX / TX two input pins need to be set. The state truth table is shown in the table below. Setting errors will result in failure to send and receive data normally.
| TX PIN | RX PIN | Radio Status |
| ------ | ------ | ----------------- |
| 1 | X | PA ( TX active ) |
| 0 | 1 | LNA ( RX active ) |
2. Recommended that the software controls the 1280 chip to output 2~5dbm, so that the entire module will output 20dbm power; When the output of the 1280 chip is higher than 2dbm, the output power of the entire module is only 20dbm; When the output of the 1280 chip is higher than 5dbm, the output power of the entire module is only 20dbm, but if 5dbm is given to the FEM, it will damage the FEM chip (the maximum input allowed by the FEM is 5dbm) .If the output of the 1280 chip is lower than 2dbm, the output power of the entire module is within 20dbm.
3. SX1280 output power setting cannot be greater than 2~5dbm, otherwise the FEM chip may be damaged. Setting 3dbm already has 20dmb output power
