LILYGO T-Display-S3 Pinout

The T-Display-S3 is LILYGO’s ESP32-S3 board with a built-in 1.9-inch, 170×320 ST7789 color LCD wired straight to the board, no separate display module or wiring needed. Pin data below is sourced from LILYGO’s own GitHub repository for this board.

System-on-chip and board

Built on an ESP32-S3R8 (the PSRAM-equipped S3 variant): 16MB flash, 8MB octal PSRAM, plenty of headroom for a color UI. The onboard display uses an 8-bit parallel interface (not SPI), which is why it needs so many dedicated GPIOs, those pins aren’t available for your own use.

Built-in display pins

GPIO15 must be set HIGH in your code before the display (and other onboard peripherals) will work at all. This is the single most common “blank screen” mistake with this board.

Buttons, battery, and other interfaces

An optional expansion shield adds a microSD slot on GPIO11 (CMD), GPIO12 (CLK) and GPIO13 (D0), only relevant if you’ve fitted that shield.

Conclusion

The built-in display makes this a genuinely different board from a bare breakout, most of its GPIOs are already spoken for by the screen, plan your project’s wiring around what’s actually left rather than assuming the ESP32-S3’s full pin count is available. For a board with the same chip and no display, more free GPIOs, see the AI-S3.

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