Arduino Breakout Boards with IPS TFT Displays for Fast UI Prototyping

Small, high-quality displays are often the most visible part of any embedded product, yet testing and refining them can be surprisingly tricky. Connecting small thin-film transistor (TFT) displays can be challenging due to voltage, interface, and backlight requirements. Newhaven Display offers breakout boards that address these issues with built-in logic-level shifting, integrated backlight drivers, and standardized connectors so designers can quickly test graphics, touch input, and firmware without designing a custom interface circuit.

In industrial or commercial environments, a display that washes out when tilted is unacceptable. Traditional TFTs often suffer from grayscale inversion and color shifting at off-axis angles. Newhaven Display’s NHD-2.4 (2.4") and NHD-2.8 (2.8") breakout boards (Figure 1) utilize In-Plane Switching (IPS) technology with a "Normally Black" transmissive mode. They provide a convenient platform for experimenting with full-color graphics, touch interfaces, and real -time feedback in handheld devices, IoT controllers, and industrial instruments.

Figure 1: The 2.4 in. and 2.8 in. versions of Newhaven's breakout modules incorporate color displays for faster prototyping and testing of user interfaces. Corner holes are provided for using screws or standoffs to secure the breakout board. (Image source: Newhaven Display)

The modules provide 240 × 320 resolution with full-color output and wide viewing angles, and include built-in LED backlights. They incorporate an ST7789VI display controller, which handles pixel addressing and display control, simplifying integration with microcontrollers, along with a built-in microSD slot for image storing (Figure 2).

Figure 2: Rear view of Newhaven's Arduino-compatible breakout board shows headers, logic-level shifters, backlight driver, microSD slot, and controller IC. (Image source: Newhaven Display)

Arduino-compatible, the Newhaven modules can interface with a variety of other microcontrollers (MCUs), including popular families such as STM32, ESP32, PIC, and RP2040. Developers can quickly prototype by connecting the modules to different MCUs using a breadboard for rapid testing of circuits, interfaces, and touch input. Any MCU that supports standard SPI or 8/16-bit parallel communication can drive the displays.

The modules feature holes for standard 2.54 mm pitch headers, allowing compatibility with solderless breadboards and 20-pin IDC cables. Integrated SD card support is implemented with dedicated interface pins for SD_SDO (Serial Data Out), SD_CS (Chip Select), and SD_CD (Card Detect), allowing fast and reliable access to stored assets such as high-resolution images.

The breakout boards include built-in logic-level shifting for 3.3 V or 5 V operation, so developers should ensure that an MCU’s voltage levels are compatible and that it can deliver the data rate needed to update the display effectively.

Embedded applications with compact displays

The modules are suitable for a range of embedded applications where a compact display is required. Some versions also feature resistive or capacitive touch panels. All share a 240 x 320 resolution and offer built‑in backlight drivers and mounting holes for easier integration during testing.

Available versions include various screen options, including:

• The HD‑2.4‑CTXP‑BREAKOUT is a 2.4 in. version featuring a 240 × 320 QVGA panel with parallel and SPI interfaces and an ST7789VI display controller.
• The NHD‑2.4C‑CSXP‑BREAKOUT incorporates a capacitive touchscreen that enables direct finger interaction with the display.
• The NHD‑2.4R‑CTXP‑BREAKOUT utilizes a resistive touchscreen layer that responds to pressure input rather than multi‑touch.
• The NHD‑2.8‑CSXP‑BREAKOUT is a 2.8 in. non-touch IPS TFT breakout module with the same 240 x 320 QVGA resolution, spreading the same number of pixels over a bigger physical area to provide a larger viewing area for interface elements, text, and graphics.
• The NHD‑2.8C‑CSXP‑BREAKOUT provides a capacitive touch panel to enable user interaction directly on the display surface while retaining the core display features and controller type.
• The NHD-2.8R-CSXP-BREAKOUT is the resistive touchscreen version of the 2.8 in. module.

Conclusion

Newhaven Display's NHD-2x-CTXP and NHD-2x-CSXP breakout modules let designers iterate on a broad range of user input and user experience features before committing to a final hardware layout. The wide viewing angles and color accuracy of IPS panels enable thoughtful display design for embedded applications.