1. Introduction
The Nextion Enhanced 2.4 inch Display NX3224K024 is a Human Machine Interface (HMI) LCD resistive touch screen designed for integration with microcontrollers such as Arduino and Raspberry Pi. This enhanced version offers several improvements over basic Nextion displays, including support for a built-in Real-Time Clock (RTC), the ability to save data to Flash memory, General Purpose Input/Output (GPIO) capabilities, a larger flash capacity, and a faster CPU. This manual provides essential information for setting up, operating, and maintaining your Nextion display.
2. Package Contents
Please verify that all items listed below are included in your package:
- 1 X Nextion Enhanced 2.4 Display (NX3224K024)
- 1 X 2-pin power supply test board
- 1 X 4-pin cable
Figure 1: Contents of the Nextion Enhanced 2.4 inch Display package. Shown are the display unit, a small green 2-pin power supply test board, and a multi-colored 4-pin cable.
3. Technical Specifications
| Feature | Specification |
|---|---|
| Model | NX3224K024 |
| Display Size | 2.4 inch |
| Resolution | 320 × 240 pixels |
| Color Depth | 65K (65536) colors |
| Visual Area | 48.96mm(L) × 36.72mm(W) |
| Layout Size | 74.4(L) × 42.72(W) × 5.8(H) mm |
| Touch Type | Resistive |
| Backlight | LED |
| Backlight Lifetime | >30,000 Hours (Average) |
| Flash Data Storage | 16MB |
| EEPROM | 1024 byte |
| RAM | 3584 byte |
| Instruction Buffer | 1024 byte |
| Built-in RTC | Yes |
| GPIO Support | Yes |
| SD Card Interface | Supports max 32G Micro TF/SD card (FAT32 format) |
| Adjustable Brightness | 0~180 nit, 1% interval |
| Recommended Power Supply | 5V 500mA DC |
| Connectivity | GPIO, USB (via adapter) |
4. Setup Guide
4.1 Power Supply
The Nextion display requires a stable 5V DC power supply with a minimum current of 500mA. It is strongly recommended to use the provided 2-pin power supply test board or a dedicated 5V power source. Powering the display directly from a microcontroller's 5V pin without sufficient current can lead to unstable operation or potential damage to the screen.
4.2 Connecting to a Microcontroller
To communicate with a host microcontroller (e.g., Arduino, Raspberry Pi), a USB to TTL adapter is typically required to connect the display to your computer for programming and debugging. The display communicates via a serial interface. Ensure correct wiring of TX, RX, VCC, and GND pins.
4.3 SD Card for Project Upload
The display features an SD card interface that supports Micro TF/SD cards up to 32GB. The SD card must be formatted to FAT32. This interface is primarily used for uploading project files created with the Nextion Editor to the display's internal flash memory.
4.4 Real-Time Clock (RTC) Battery
The Nextion Enhanced display includes a built-in Real-Time Clock (RTC) function. A small coin cell battery (not included) can be installed to maintain the RTC's timekeeping when the display is powered off. This battery does not supply power to the display for operation.
5. Operating Instructions
5.1 Nextion Editor Software
The Nextion display is programmed using the official Nextion Editor software, available for download from the manufacturer's website. This software allows you to design graphical user interfaces (GUIs), create interactive elements (buttons, text fields, progress bars), and define the display's behavior. The display operates by receiving commands and sending data via its serial interface, enabling interaction with a host microcontroller.
5.2 Uploading Projects to the Display
Projects created with the Nextion Editor can be uploaded to the display's internal flash memory using one of two methods:
- Via MicroSD Card:
- Export your compiled project (.tft file) from the Nextion Editor to a FAT32 formatted MicroSD card.
- Insert the MicroSD card into the display's SD card slot.
- Power on the display. The display will automatically detect the .tft file and begin the upload process.
- Once the upload is complete, power off the display, remove the SD card, and then power it back on to run the new project.
- Via USB to TTL Adapter:
- Connect the display to your computer using a USB to TTL adapter.
- In the Nextion Editor, select the appropriate COM port for your adapter and initiate the upload directly.
6. Maintenance
To ensure the longevity and optimal performance of your Nextion display, follow these maintenance guidelines:
- Cleaning: Keep the display clean and free from dust. Use a soft, dry, lint-free cloth to gently wipe the screen surface. Avoid using abrasive cleaners, solvents, or excessive moisture, as these can damage the screen or touch panel.
- Environmental Conditions: Operate the display within its specified temperature and humidity ranges. Avoid exposing it to extreme temperatures, direct sunlight for prolonged periods, or high humidity.
- Backlight Lifetime: The LED backlight has an average lifetime of over 30,000 hours under normal operating conditions. Dimming the backlight when not in active use can extend its lifespan.
7. Troubleshooting
If you encounter issues with your Nextion Enhanced 2.4 inch Display, refer to the following common problems and solutions:
- Display not powering on:
- Verify that the 5V 500mA DC power supply is correctly connected and providing adequate power.
- Check all power connections for secure contact.
- Display not responding to touch:
- Ensure the resistive touch panel is properly connected.
- If applicable, check for touch calibration settings within your Nextion project.
- Project upload failure:
- When using an SD card, confirm it is formatted to FAT32 and the .tft file is placed in the root directory.
- Verify the integrity of the project file.
- If using a USB to TTL adapter, ensure the correct COM port is selected in the Nextion Editor and the adapter is functioning correctly.
- Real-Time Clock (RTC) not keeping time:
- Ensure a compatible coin cell battery is installed correctly in the RTC battery holder (if present and used).
- Communication issues with microcontroller:
- Double-check all wiring between the display and the microcontroller (TX, RX, VCC, GND).
- Verify that the baud rates configured in your microcontroller's code match the settings in your Nextion project.
- Review your microcontroller's code for correct serial communication implementation.
For further assistance, please refer to the official Nextion documentation and community forums, or contact the seller directly.
8. Warranty and Support
For warranty information, technical support, or any product-related inquiries, please contact the seller directly through the platform where the product was purchased. When contacting support, please provide your order details and a clear description of the issue to facilitate a prompt resolution.
To contact the seller (DIYmalls) on Amazon, navigate to the product page, locate the "Sold by DIYmalls" link (typically found under the "Buy Now" button), and click on "Ask a question" on the new page.