Sunton / CYD · ESP32 · 3.5" · 320×480
Sunton (CYD) ESP32-3248S035R 3.5" (classic ESP32-WROOM-32 revision) specifications
The Sunton (CYD) ESP32-3248S035R 3.5" (classic ESP32-WROOM-32 revision) is a 3.5" 320×480 display board by Sunton / CYD, built around the ESP32 (ESP32-WROOM-32 (ESP32-D0WDQ6) module) running at 240 MHz. The panel uses a ST7796 (SPI) controller over SPI, with XPT2046 (resistive, SPI) touch input. Memory: 4 MB flash, no PSRAM; wireless: Wi-Fi and Bluetooth. LCD Ultra Pro supports it with a ready-made LVGL 8.4 display driver, so you can design its UI visually and export a complete Arduino project.
- Screen
- 3.5" · 320×480
- Chip
- ESP32
- Memory
- 4 MB flash, no PSRAM
- Input
- resistive touch
Specifications
| Manufacturer | Sunton / CYD |
|---|---|
| Screen size | 3.5" |
| Resolution | 320×480 px |
| Colour depth | 16-bit |
| Display controller | ST7796 (SPI) |
| Display interface | SPI |
| Touch | XPT2046 (resistive, SPI) |
| Microcontroller | ESP32 |
| Module | ESP32-WROOM-32 (ESP32-D0WDQ6) |
| CPU clock | 240 MHz |
| Internal SRAM | 520 KB |
| PSRAM | None |
| Flash | 4 MB |
| Wi-Fi | Yes |
| Bluetooth | Yes |
| Hardware variant | ESP32 + ST7796 revision (touch on the shared SPI bus). An older ILI9486 revision with separate touch pins is sold under the same name and is not covered. |
Free GPIOs and connectors
These GPIOs are not used by the display, touch or on-board peripherals, so you can wire your own sensors, buttons or relays to them.
| Pin | Capabilities | Note |
|---|---|---|
| GPIO 0 | GPIO, BOOT | Boot button / IO0 |
| GPIO 1/TX | GPIO, UART_TX | UART0 TX |
| GPIO 3/RX | GPIO, UART_RX | UART0 RX |
| GPIO 5 | GPIO, PWM | Presumably SD_CS — the local source had no SD card code, needs verification |
| GPIO 18 | GPIO, PWM | Presumably SD_SCK, needs verification |
| GPIO 19 | GPIO, PWM | Presumably SD_MISO, needs verification |
| GPIO 21 | GPIO, PWM, I2C_SDA | Free, broken out |
| GPIO 22 | GPIO, PWM | Not used by this ST7796 revision (the older ILI9486 revision uses it for touch) — reportedly on the P3 header (with 21 / 35); needs checking on a board |
| GPIO 23 | GPIO, PWM | Presumably SD_MOSI, needs verification |
| GPIO 25 | GPIO, ADC, DAC | Free, broken out |
| GPIO 32 | GPIO, ADC | Free, broken out |
| GPIO 34 | GPIO, ADC | Input-only pin, presumably an LDR |
| GPIO 35 | GPIO, ADC | Input-only pin, free |
LVGL support in LCD Ultra Pro
| Driver status | Compile-tested |
|---|---|
| Arduino export | Complete LVGL 8.4 project with the display driver |
| USB Live preview | No |
| Orientations | 0°, 90° |
| Brightness control | Hardware backlight dimming |
Pick this board in the editor and the canvas matches its exact resolution and shape. Build the interface with widgets, add events without code, try it in Live Preview, then export it as a ready-to-compile Arduino project. See the documentation for the workflow.
Frequently asked questions
What is the resolution of the Sunton (CYD) ESP32-3248S035R 3.5" (classic ESP32-WROOM-32 revision)?
320×480 pixels on a 3.5" screen, driven at 16-bit colour depth.
Which display controller and interface does it use?
ST7796 (SPI) over SPI.
Does the Sunton (CYD) ESP32-3248S035R 3.5" (classic ESP32-WROOM-32 revision) have a touchscreen?
Yes — XPT2046 (resistive, SPI).
Which ESP32 chip and how much memory does it have?
ESP32 (ESP32-WROOM-32 (ESP32-D0WDQ6)) at 240 MHz, 4 MB flash, no PSRAM.
Which GPIOs are free for my own sensors or relays?
13 GPIOs are free: GPIO 0, GPIO 1/TX, GPIO 3/RX, GPIO 5, GPIO 18, GPIO 19, GPIO 21, GPIO 22, GPIO 23, GPIO 25, GPIO 32, GPIO 34, GPIO 35.
Can I use LVGL on the Sunton (CYD) ESP32-3248S035R 3.5" (classic ESP32-WROOM-32 revision)?
Yes. LCD Ultra Pro has a ready-made LVGL 8.4 display driver for this board (Compile-tested). Design the UI in the browser and export a ready-to-compile Arduino project.
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