Open Nextion Genius HMI Module 3.5" with ESP32-S3 Wi-Fi Bluetooth touchscreen
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Open Nextion ONX3248G035 3.5" ESP32-S3 Wi-Fi BLE 5 LCD HMI
ONX3248G035 is an LCD development board with a 3.5" 320×480 px screen, capacitive touch panel, and ESP32-S3R8 module. The system supports Wi-Fi 2.4 GHz, Bluetooth 5 LE, 16 MB Flash, 8 MB PSRAM, and interfaces including UART, I2C, camera, microphone, speaker, GPIO, and microSD card.
Key features:
- Processor ESP32-S3R8: dual-core Xtensa 32-bit LX7 up to 240 MHz.
- LCD screen 3.5" with a resolution of 320×480 px.
- Capacitive touch panel with CST826 controller.
- 16 MB Flash and 8 MB PSRAM.
- Wireless connectivity Wi-Fi 2.4 GHz and Bluetooth 5 LE.
- Built-in PCB antenna and IPEX-1 connector for an external antenna.
- Grove I2C and UART interfaces for quick module connection.
- 24-pin FPC camera connector, compatible with OV2640 and OV5640, among others.
- PDM digital microphone interface and speaker connector up to 2 W.
- microSD slot for application memory expansion.
- RTC with a separate backup battery connector 3 V.
- Li-Ion battery support 3.7 V with charging circuit.
- Power supply, programming, and logging via USB-C.
- Support for environments Arduino IDE and ESP-IDF.
Product description
Open Nextion Genius Series is a series of integrated HMI terminals based on the ESP32-S3, designed for projects with a touch screen, wireless communication, and extensive peripherals. Compared to classic Nextion modules, the Open Nextion series offers greater programming flexibility and more hardware interfaces.
The ONX3248G035 model is suitable for control panels, smart home gateways, lighting controllers, industrial interfaces, and IoT devices requiring a local GUI. The module is not compatible with the Nextion Editor environment intended for the original Nextion series.
Board component description
The list below corresponds to the numbering of elements visible in the board photo.
- USB_UART: USB-C connector for power, firmware programming, and log reading via USB-UART.
- RTC BAT: RTC backup battery connector 3 V, type MX1.25-2P.
- BOOT Button: button to enter firmware download mode; hold BOOT and press RESET.
- RESET Button: board reset button.
- I2C Interface: I2C interface in Grove standard, connector PH2.0-4P.
- UART1 Interface: UART1 interface in Grove standard, connector PH2.0-4P.
- External Antenna Connector: IPEX-1 connector for an external antenna after changing the resistor configuration.
- Antenna: built-in PCB antenna for Wi-Fi and Bluetooth communication.
- MIC_PDM Interface: PDM digital microphone interface, FPC 4-pin connector 0.5 mm.
- GPIOs: FPC 24-pin connector 0.5 mm with lines 5 V, 3.3 V, GND, and 14 IO pins.
- CAMERA Interface: FPC 24-pin camera connector 0.5 mm, supports OV2640, OV5640, and similar cameras.
- SD: microSD card slot for memory expansion.
- SPK: speaker connector MX1.25-2P, supports speaker up to 2 W.
- UART0 Interface: XH2.54-4P connector for serial communication, programming, logs, and power.
- Power Switch: board power switch.
- PWR: power LED; lights up red when turned on.
- CHG: battery charging LED; lights up red during charging.
- BAT: Li-Ion battery connector 3.7 V, type MX1.25-2P.
Programming platform
ONX3248G035 can be programmed in Arduino IDE or ESP-IDF. Arduino IDE facilitates rapid prototyping and interface startup, while ESP-IDF provides greater control over hardware, performance, and system configuration.
- Arduino IDE: a good solution for rapid prototyping and educational projects.
- ESP-IDF: recommended for advanced applications, performance optimization, and production projects.
- LVGL: possibility to create graphical interfaces for the SPI touch screen.
Application
- smart home control panels,
- IoT gateways with a local touch interface,
- lighting and automation controllers,
- HMI terminals for industrial devices,
- projects with camera, microphone, and audio support,
- applications with Wi-Fi, BLE, and graphical display.
Dimensions
Technical specification
- Model: ONX3248G035
- Series: Open Nextion Genius
- Screen size: 3.5"
- Resolution: 320×480 px
- Number of colors: 262K
- Brightness: 300 nit
- Touch type: capacitive
- Panel controller: ST7796
- Touch controller: CST826
- MCU: ESP32-S3R8
- Processor: Xtensa 32-bit LX7 dual-core up to 240 MHz
- Flash: 16 MB
- PSRAM: 8 MB
- Connectivity: Wi-Fi 2.4 GHz, Bluetooth 5 LE
- Power supply: DC 5 V / 1 A
- Operating temperature: -20~70°C
- Storage temperature: -30~80°C
- Weight: net 61 g, gross 115 g
Kit contents
- Open Nextion ONX3248G035 3.5" development board
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