LilyGo T4-S3
LilyGo T4-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 T4-S3
๐ The LilyGo T4-S3 is an ESP32-S3-based development board designed for high-performance IoT applications. Featuring a large 4.2-inch e-paper display and low-power consumption, it is ideal for smart display projects. โก
๐ก With WiFi 802.11 b/g/n and Bluetooth 5 (LE), it supports seamless wireless communication, making it perfect for remote monitoring and embedded systems.
๐พ The T4-S3 comes with 8MB PSRAM and 16MB Flash, providing ample memory for complex applications.
Technical Specifications
Complete technical specification details for LilyGo T4-S3
Quick Setup
Copy-paste configs for LilyGo T4-S3 - auto‑generated from this board's exact hardware specs.
In Arduino IDE 2 select Lilygo T4 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 T4 S3" for the LilyGo T4-S3.
LilyGo T4-S3 Pinout Diagram
Complete pin reference for LilyGo T4-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 T4-S3
LilyGo T4-S3 Custom Pin Mapping
Pin configuration and GPIO mapping for LilyGo T4-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 | EPD_DC | OUTPUT | GPIO, E-Paper Data/Command |
| 12 | IO22 | EPD_RST | OUTPUT | GPIO, E-Paper Reset |
| 13 | IO23 | EPD_BUSY | INPUT | GPIO, E-Paper Busy Signal |
Default Tools & Configuration
Build and upload settings for LilyGo T4-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 T4-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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