ESP32-P4X AI Box Kit with 3.4" Round Display — 800×800 MIPI-DSI Capacitive Touch, 300 nits
A bigger round canvas for your ESP32-P4 project: 800 × 800, ready on first boot.
When 480 × 480 starts to feel cramped, this is the step up. The ESP32-P4X AI Box drives a 3.4-inch round TFT at 800 × 800 over MIPI-DSI, with capacitive touch on I²C. That is more than two and a half times the pixels of a 2.8-inch 480 × 480 round screen, enough for fine dial markings, animated faces, live camera previews and readable text inside a circular frame.
The display flex connects straight to the board’s display connector. Plug it in, power up, and the circular UI is on screen, with no adapter board and no hand-written init sequence to hunt down.
The board behind it is built around the ESP32-P4X: dual-core RISC-V at up to 400 MHz, 32 MB PSRAM and 16 MB flash, with Wi-Fi 6 on dual-band 2.4/5 GHz through a companion ESP32-C5. A full 800 × 800 frame takes only about 1.3 MB in RGB565 (1.9 MB in RGB888), so double buffering fits comfortably in PSRAM. Camera input, a two-mic audio codec, stereo amplifiers, a MicroSD slot, USB 2.0 High-Speed and lithium-battery charging are all on the same board, so you can go from prototype to a working device without adding modules.
Specifications
3.4-Inch Round Display
| Item | Specification |
|---|---|
| Display Size | 3.4 inch (round) |
| Display Mode | Normally black, free viewing angle |
| Resolution | 800 (RGB) × 800 |
| Pixel Pitch | 36.5 (H) × 109.5 (V) µm (sub-pixel) |
| Pixel Arrangement | RGB vertical stripe |
| Active Area (LCD AA) | 87.6 × 87.6 mm |
| Module Outline | 94.9 (H) × 96.95 (V) × 2.22 (D) mm |
| Colour Depth | 16.7M colours |
| Interface | MIPI-DSI |
| Touch | Capacitive touch, I²C |
| Luminance | 300 cd/m² (typ.) |
| Operating Temperature | -20 °C to +70 °C |
| Storage Temperature | -25 °C to +75 °C |
| Compliance | RoHS |
ESP32-P4X AIBox Board
| Item | Specification |
|---|---|
| Board Model | ESP32-P4X AIBox, revision R3 |
| Processor | ESP32-P4X (ESP32-P4 silicon v3.x, ESP32-P4XNRW32); dual-core RISC-V up to 400 MHz + low-power core |
| PSRAM | 32 MB in-package, 200 MHz, HEX mode; supports XIP |
| Flash | 16 MB SPI NOR, DIO mode at 80 MHz |
| Wireless | ESP32-C5-MINI-1-N4; dual-band 2.4 / 5 GHz Wi-Fi 6; SDIO to main processor via ESP-Hosted |
| Display Interface | 2-lane MIPI-DSI; 30-pin, 0.5 mm FPC; SY7200 boost constant-current backlight driver; touch I²C, INT and reset |
| Camera Interface | 2-lane MIPI-CSI; 24-pin, 0.5 mm FPC; onboard 24 MHz clock; 1.8 V / 1.5 V / 3.3 V adjustable rails |
| Supported Camera | SC2336 (1080p30) and OV2710 (720p25), auto-detected at boot |
| Audio | ES8389 codec (I²S + I²C); 2 analog MEMS microphones; 2 × NS4150B Class-D amplifiers; 2 × 1.25 mm speaker connectors |
| Sensor | SC7A20 3-axis accelerometer on I²C, INT1 to main processor |
| Storage | MicroSD slot, 4-bit SDMMC, card detect and power switching |
| USB | 2 × USB Type-C with ESD protection: UART (USB-Serial-JTAG) and USB 2.0 High-Speed OTG (480 Mbps) |
| Power Management | AXP2101; USB 5 V input; single-cell lithium battery (1.25 mm, 2-pin); power button, power LED, charge LED |
| Expansion | 8-pin 1.25 mm (GPIO1–GPIO5, 3.3 V, VSYS, GND); 6-pin 1.27 mm ESP32-C5 debug header |
| Mounting | 2 × M3 mounting holes |
| Development | ESP-IDF v6.1 recommended (min. v5.5.3 for P4 silicon v3.x); esptool v5.3.0 / v4.12.0 or later |
| Default Partition | 16 MB: NVS 24 KB, PHY 4 KB, factory app 6 MB, assets (FAT) ~7.9 MB |
Key Features
- 3.4" round, 800 × 800, 2.5× the pixels of our 2.8" kit. Sharper gauges, finer text and full-frame camera preview inside a circular aperture, with a 1:1 pixel grid and no cropped corners.
- Board included: a complete ESP32-P4 development platform. 400 MHz dual-core RISC-V, 32 MB PSRAM, 16 MB flash, Wi-Fi 6, camera, audio, SD card, USB High-Speed and battery management on a single board.
- Plug-and-play MIPI-DSI display connection. The panel’s flex connects directly to the board’s display connector, touch lines included. No adapter PCB or re-wiring.
- Capacitive multi-touch built into the panel. I²C touch with INT and RST lines, tested with the supplied firmware and ready for LVGL.
- On-device voice and vision. ESP-SR wake word and offline commands, and ESP-DL models on the AI-extended RISC-V cores, with two microphones already wired. No external NPU needed.
- Camera, audio and motion sensing on board. MIPI-CSI camera input (SC2336 / OV2710), a codec with dual mics and stereo Class-D amplifiers, and a 3-axis accelerometer for tap and tilt gestures.
- 300 nits IPS-class brightness for indoor devices. Suitable for desktop, wall-mount and handheld products. Higher-brightness versions available on request.
- Battery-ready, USB-C powered. Lithium charging with power path, dual USB-C, and two M3 mounting holes for enclosure design.
Drawing & Pin definition
Typical Applications:
- Smart home hubs and thermostat dials: a large circular touch surface for temperature rings, scenes, room controls and weather, all in high resolution.
- AI companion devices and desktop robots: room for expressive animated eyes and responsive UI, with wake word on-device and the language model in the cloud.
- Voice assistants and smart displays: show listening, thinking and speaking states, plus transcripts and album art, on a round face.
- Camera terminals and video doorbells: live preview from the MIPI-CSI camera, with local detection when the network is down.
- Vehicle, e-bike and instrument gauges: speedometer, power and battery dials drawn at 800 × 800 for crisp needles and fine scales.
- Wearable-scale industrial HMI and test equipment: a compact round control panel with touch, battery and Wi-Fi 6 in one board.
