LilyGo-LoRa-Series/docs/en/t3_s3_sx1280pa/t3_s3_sx1280pa.md

🌟LilyGo T3 S3 SX1280PA🌟

Overview

• This page introduces the hardware parameters related to LilyGo T3 S3 SX1280PA

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-SX1280PA
   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
Uart1 TX	43(External QWIIC Socket)	✅️
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(SX1280) SCK	5	❌
LoRa(SX1280) MISO	3	❌
LoRa(SX1280) MOSI	6	❌
LoRa(SX1280) RESET	8	❌
LoRa(SX1280) DIO1	9	❌
LoRa(SX1280) BUSY	36	❌
LoRa(SX1280) CS	7	❌
LoRa(SX1280) TX	10	❌
LoRa(SX1280) RX	21	❌
Button1 (BOOT)	0	❌
Battery ADC	1	❌
On Board LED	37	❌

• QWIIC IO10/IO21 GPIOs are already connected to the Radio TX/RX Pin and cannot be used.
• 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.

🧑🏼‍🔧 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

[!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

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	SX1280
Frequency range	2400 ~ 2500MHz
Transfer rate(LoRa)	0.476 ～ 202 Kbps
Transfer rate(FSK)	0.125 ～ 20000 Kbps
Transfer rate(FLRC)	260 ～ 1300 Kbps
Modulation	LoRa 、 FLRC 、 (G)FSK

WiFi-IPEX

• The following figure shows how to switch the onboard WIFI antenna to IPEX

T3 V1.2	T3 V1.3

LoRa-IPEX

• The following figure shows how to switch the onboard LoRa SMA antenna to IPEX

Frequently asked questions

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

Resource

• T3_S3_V1.2 schematic
• T3_S3_V1.3 schematic
• SX1280 datasheet