Waveshare ESP32-S3-Touch-LCD-3.49
3.49" 172x640 IPS LCD (AXS15231B, QSPI), AXS15231B (integrated touch) touch, ES8311 audio, TF card, QMI8658, PCF85063.
Building for it
A project is made for one toolchain, picked when you start it. For this board you can use 2 of them:
| Toolchain | |
|---|---|
| Arduino (C++) | Every board, every widget and every peripheral here. The most control, and the most to set up. Start a project |
| MicroPython | The MicroPython export drives SPI panels only. |
| ESPHome | No compiler to install, and the panel can join Home Assistant as real entities. Start a project |
At a glance
| Part | Detail |
|---|---|
| Maker | Waveshare |
| MCU | ESP32-S3 Xtensa LX7 dual-core @ 240 MHz, 512 KB SRAM (+ 2-16 MB PSRAM on most modules) |
| Display | Astra AXS15231B, 172 x 640 px, QSPI (quad SPI), 16-bit colour |
| Touch | Astra AXS15231B (touch half) (capacitive, I2C) |
| Backlight | GPIO 42, dimmable (PWM) |
| Memory | 16 MB flash, 8 MB octal PSRAM (N16R8) |
| Graphics library | GFX Library for Arduino |
Display pins
AXS15231B on QSPI (quad SPI): QSPI clock 40 MHz, host SPI3_HOST, RGB colour order, inversion off.
| Signal | Pin |
|---|---|
| SCK | GPIO 10 |
| D0 - D3 | GPIO 11, 12, 13, 14 |
| CS | GPIO 9 |
| RESET | TCA9554PWR pin 5 |
| Backlight | GPIO 42 (active low) |
Touch pins
AXS15231B (touch half): I2C address 0x3B, 400 kHz.
| Signal | Pin |
|---|---|
| SDA | GPIO 17 |
| SCL | GPIO 18 |
| INT / IRQ | TCA9554PWR pin 0 |
| RESET | not connected |
Also on the board
- I2C (GPIO 17 / 18) - SDA GPIO 17, SCL GPIO 18
- TCA9554PWR I/O expander at 0x20, driving the lines marked above
The preset adds these to the Hardware tab with the board, so a sensor can go straight onto the connector.
Check your revision. Pins from Waveshare's demo code and schematic (https://github.com/waveshareteam/ESP32-S3-Touch-LCD-3.49-V2). Two hardware revisions with different pins; recorded V2 (Rev1.1 silkscreen), which is all that ships since 2026-06-08.
Designing for it in LCD Wizard
- Choose Waveshare ESP32-S3-Touch-LCD-3.49 on the Hardware tab (or use the button above) and every pin on this page is filled in. The export writes the sketch,
lcd_pins.h, the GFX Library for Arduino configuration,lv_conf.handplatformio.ini- a project that builds for this board as it comes. - The AXS15231B (touch half) is capacitive and needs no calibration. The firmware resets it and checks it answers on every boot.
- The backlight is dimmable: give a slider or a button a Set backlight action.
- With PSRAM the LVGL memory pool can live there, leaving internal RAM for everything else.
- Screens are designed for 172 x 640 px in either orientation, with LVGL 9 or LVGL 8.
The parts
AXS15231B. Combined display + capacitive touch controller. Touch shares the same part. Drawn a whole frame at a time, so it needs PSRAM.
AXS15231B (touch half). The same silicon as the AXS15231B display controller; touch is read over I2C.
ESP32-S3. The only common Arduino target with a hardware RGB565 LCD peripheral. PSRAM is effectively required for RGB panels.
GFX Library for Arduino. Moshi Liu's library. Best QSPI/AMOLED and RGB coverage. Configured in code.
The pinout on one page
Every pin above, laid out to print and keep beside the bench. Generated from this preset, so it says exactly what the designer writes into lcd_pins.h.
Download the pinout (PNG)Open it as SVG
From the people who made it
The board’s own documentation. Pinouts on vendor pages do sometimes disagree with the hardware in front of you - where this page and that one differ, trust your board and tell us.
- The vendor’s product page
- Vendor documentation
- Schematic (PDF)
- Waveshare demo code (pins read from here)
Designs for this board
Nobody has published a design for this board yet. Publish yours from the designer and it appears here and in the gallery.
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- Quick start - from an empty screen to firmware on the board
- Boards and displays - presets, controllers, pins and touch in the designer
- Flashing and configuration - PlatformIO, the Arduino IDE and first-boot checks
- Troubleshooting - a white screen, mirrored image or touch that misses