LilyGo T-Dongle S3
LilyGo T-Dongle S3 is a development board based on the ESP32S3 microcontroller using XTENSA architecture.
This board features a maximum CPU frequency of 240 MHz and 16MB flash memory.
About LilyGo T-Dongle S3
๐ The LilyGo T-Dongle S3 is a compact development board featuring an ESP32-S3 processor with integrated WiFi and Bluetooth 5. It is designed as a USB-powered dongle for easy plug-and-play development. โก
๐ก The T-Dongle S3 is equipped with 8MB PSRAM and 16MB Flash, providing ample memory for IoT and embedded applications.
๐พ With multiple GPIOs, ADC, PWM, I2C, and SPI support, this board is ideal for prototyping and rapid development.
Technical Specifications
Complete technical specification details for LilyGo T-Dongle S3
Quick Setup
Copy-paste configs for LilyGo T-Dongle S3 - auto‑generated from this board's exact hardware specs.
In Arduino IDE 2 select Lilygo T Dongle S3 from the esp32 by Espressif package. In PlatformIO use board = esp32-s3-devkitm-1. ESP32S3 · 240 MHz · 16MB · DIO.
In Arduino IDE 2, open Boards Manager, search "esp32" by Espressif and install it. Then go to Tools โ Board and select "Lilygo T Dongle S3" for the LilyGo T-Dongle S3.
LilyGo T-Dongle S3 Pinout Diagram
Complete pin reference for LilyGo T-Dongle S3
Safe Pins to Use
These pins are safe for general GPIO usage without boot or system conflicts.
Pins to Avoid or Use with Caution
Reserved for critical functions. Misuse may cause boot failures, programming issues, or system conflicts.
| Pin | Label | Why Avoid | Type |
|---|---|---|---|
| IO3 | GPIO3 | Sampled at reset to select JTAG interface (USB Serial/JTAG controller vs. external pins). Improper use can disable external JTAG or alter debug interface. | ๐ ๏ธ Strapping |
| IO19 | USB_D- | By default connected to the on-chip USB Serial/JTAG controller. Using it as general GPIO without reconfiguring IO MUX will interfere with USB functionality. | ๐ USB |
Useful Links
Datasheets and resources for LilyGo T-Dongle S3
LilyGo T-Dongle S3 Custom Pin Mapping
Pin configuration and GPIO mapping for LilyGo T-Dongle S3
| Pin | Function | ESP Pin | I/O Type | Description |
|---|---|---|---|---|
| 1 | 3V3 | 3.3V | POWER OUTPUT | 3.3V power output |
| 2 | GND | GND | POWER GROUND | Ground connection |
| 3 | 5V | 5V | POWER INPUT | 5V power input |
| 4 | IO1 | GPIO1 | BIDIRECTIONAL | GPIO, ADC, I2C |
| 5 | IO2 | GPIO2 | BIDIRECTIONAL | GPIO, ADC |
| 6 | IO3 | GPIO3 | BIDIRECTIONAL | GPIO, ADC |
| 7 | IO16 | SPI_CS | BIDIRECTIONAL | GPIO, SPI Chip Select |
| 8 | IO17 | SPI_D | BIDIRECTIONAL | GPIO, SPI Data |
| 9 | IO18 | SPI_CLK | BIDIRECTIONAL | GPIO, SPI Clock |
| 10 | IO19 | SPI_Q | BIDIRECTIONAL | GPIO, SPI Q |
| 11 | IO21 | USB_D+ | BIDIRECTIONAL | GPIO, USB Data+ |
| 12 | IO22 | USB_D- | BIDIRECTIONAL | GPIO, USB Data- |
| 13 | IO23 | RGB_LED | OUTPUT | GPIO, Addressable RGB LED |
Default Tools & Configuration
Build and upload settings for LilyGo T-Dongle S3
| Setting | Value |
|---|---|
| Bootloader tool | esptool_py |
| Uploader tool | esptool_py |
| Network uploader tool | esp_ota |
| Bootloader address | 0x0 |
| Flash mode | dio |
| Boot mode | qio |
| PSRAM type | opi |
| Maximum upload size | 3072 KB (3145728 bytes) |
| Maximum data size | 320 KB (327680 bytes) |
The LilyGo T-Dongle S3 uses esptool_py for uploads , esp_ota for OTA updates, and esptool_py bootloader at 0x0.
Flash mode: dio | Boot mode: qio | PSRAM: opi
Max sketch size: 3072 KB | Max data size: 320 KB
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