Open Nextion Genius HMI Module 2.8" with ESP32-S3 Wi-Fi Bluetooth touchscreen
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Open Nextion ONX2432G028 2.8" ESP32-S3 Wi-Fi BLE 5 LCD HMI
ONX2432G028 is an LCD development board with a 2.8" 240×320 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 2.8" with a resolution of 240×320 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 located on the back of the PCB.
- RTC with a separate connector for a backup battery 3 V.
- Support for Li-Ion battery 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 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 ONX2432G028 model is suitable for control panels, smart home gateways, lighting controllers, industrial interfaces, and IoT devices requiring a compact GUI. The module is not compatible with the Nextion Editor environment intended for the original Nextion series.
Description of board elements
The list below corresponds to the numbering of elements visible in the board photo.
- USB_UART: USB-C connector for power supply, firmware programming, and log reading via USB-UART.
- RTC BAT: RTC backup battery connector 3 V, type MX1.25-2P.
- I2C: I2C interface in Grove standard, connector PH2.0-4P.
- UART1: 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: PDM digital microphone interface, 4-pin FPC connector 0.5 mm.
- GPIOs: 24-pin FPC connector 0.5 mm with lines 5 V, 3.3 V, GND, and 14 IO pins.
- CAMERA: 24-pin FPC camera connector 0.5 mm, support for OV2640, OV5640, and similar cameras.
- SPK: MX1.25-2P speaker connector, support for speaker up to 2 W.
- SD: microSD card slot located on the back of the PCB.
- UART0: XH2.54-4P connector for serial communication, programming, logs, and power.
- RST Button: board reset button.
- BOOT Button: button to enter firmware download mode; hold BOOT and press RESET.
- Power Switch: board power switch.
- PWR: power LED; glows red when turned on.
- CHG: battery charging LED; glows red during charging.
- BAT: Li-Ion battery connector 3.7 V, type MX1.25-2P.
Programming platform
ONX2432G028 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
- compact smart home control panels,
- IoT gateways with a local touch interface,
- lighting and automation controllers,
- HMI terminals for industrial devices,
- projects with a camera, microphone, and audio support,
- applications with Wi-Fi, BLE, and a graphical display.
Dimensions
Technical specification
- Model: ONX2432G028
- Series: Open Nextion Genius
- Screen size: 2.8"
- Resolution: 240×320 px
- Number of colors: 262K
- Brightness: 300 nit
- Touch type: capacitive
- Panel controller: ST7789
- 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 47 g, gross 100.5 g
Kit contents
- Open Nextion ONX2432G028 2.8" development board
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