1.69 inch Arduino Display 240×280 ST7789 SPI

Product Overview of Arduino Display

This HTM-H017A05-SPI-V0, launched by HOTHMI, is a high-performance 1.69-inch Arduino Display TFT color LCD module. It features a normally black panel design with a resolution of 240×3RGB×280 and achieves 58% NTSC color saturation, delivering delicate, vivid, and true-to-life images. The module is built around the classic ST7789 built-in driver chip and employs a flexible, high-efficiency 4-wire 8-bit serial SPI interface, with a stable operating voltage of 3.0V to 3.3V, greatly facilitating system integration and development.

In terms of display performance, this Arduino Display screen offers a typical brightness of 500 cd/m² (under constant current testing) and supports full viewing angles of U85/D85/R85/L85, ensuring clear visibility under strong lighting or various viewing angles. As an industrial-grade reliable product, it operates across -20°C to +70°C and can withstand storage temperatures from -30°C to +80°C in harsh environments. Structurally, its PCB measures 48.00mm × 31.00mm and features standard pin headers and mounting holes for secure assembly.

Key Highlights of Arduino Display

As an excellent Arduino Display choice, the HTM-H017A05-SPI-V0 demonstrates several compelling competitive advantages in its hardware specifications:

• 1.69-inch Golden Size with Ultra-Narrow Bezel: The active display area of 27.97mm × 32.63mm provides an outstanding screen-to-body ratio and visual impact in smartwatches and portable instruments.
• Full Viewing Angle (IPS-Level) Visual Experience: Adopting an advanced wide-viewing-angle panel with viewing angle parameters of U85/D85/R85/L85, this screen maintains clear, vivid colors without color shift or white inversion from any direction – top, bottom, left, or right.
• High-Brightness Backlight for Strong Light Conditions: Under constant current testing, the module delivers a typical brightness of 500 cd/m², making it exceptionally bright and readable even indoors under intense lighting.
• Wide-Temperature Industrial-Grade Reliability: The module operates stably from -20°C to +70°C and withstands extreme storage from -30°C to +80°C, far exceeding consumer-grade displays and perfectly suiting industrial control and outdoor equipment.
• Highly Compatible 3.3V Logic: With an operating voltage of 3.0V to 3.3V, it natively supports modern 3.3V platforms such as ESP32, Raspberry Pi Pico, and Arduino Nano 33 series. With a level shifter, it can also pair seamlessly with the traditional 5V Arduino Uno.

Pin Description of Arduino Display

Application Scenarios of Arduino Display

Powered by the robust ST7789 driver core and outstanding display parameters, this 1.69-inch Arduino Display screen finds broad applications across consumer electronics and creative industrial projects:

• Smart Wearables and Health Monitoring: The 1.69-inch size is a classic fit for smartwatches, bands, and activity trackers. Its high color gamut and full viewing angles make it ideal for displaying dynamic heart rate curves, step counts, notification alerts, and custom watch faces.
• Desktop Mini Terminals and Secondary Screens: Frequently used as a PC hardware monitoring secondary screen (showing CPU temperature, network speed, memory usage), weather stations, or desktop mini TV displays.
• Smart Home Control Panels: Can be integrated into wall-mounted smart switches, thermostat panels, or micro control centers for smart appliances, displaying temperature, humidity, and sliding interactive menus.
• Portable Industrial Measurement Instruments: Thanks to its -20°C to +70°C operating range, it is well-suited for handheld infrared thermometers, oscilloscopes, and automotive diagnostic tools (OBD) in outdoor portable devices.
• Creative Electronics and Open-Source DIY: Serves as the primary visual output module for advanced graphical user interfaces (GUI) in various maker projects based on Arduino Display, ESP32, or Raspberry Pi.

Technical Q&A of Arduino Display

Q1: Can this 1.69-inch screen be used directly with a traditional Arduino Uno (5V logic)?

A1: Directly connecting the data lines to 5V logic pins is not recommended. The main power supply VCI and the ST7789 driver chip on this module both operate at 3.3V logic levels. If directly connected to digital pins on an Arduino Uno or Mega that output 5V logic, prolonged operation may damage the LCD driver IC, or cause the screen to display white or fail to initialize properly.

Correct approach: It is advisable to place a level shifter chip (such as 74HC4050 or CD4050) between the Arduino Uno’s data output pins (e.g., D11, D13, D10) and the screen’s input pins (SCL, SDA, CS), or use a resistor divider method to step down the 5V signal to 3.3V. Alternatively, if using a native 3.3V controller like ESP32, Raspberry Pi Pico, or Arduino Due, direct hardware pin connection is safe.

Q2: How can I improve the refresh rate of this screen on the Arduino platform to achieve smooth dynamic visuals?

A2: To make this 1.69-inch screen display smoother, here are three practical optimization methods:

Increase SPI Clock Speed: The ST7789 chip is highly capable. In the driver configuration (e.g., in the TFT_eSPI library’s User_Setup.h file), raise the hardware SPI frequency to 40MHz (#define SPI_FREQUENCY 40000000) or even 60MHz to exponentially boost image transfer speeds.

Use Partial Refresh: When only numbers or individual icons change on the screen, avoid refreshing the entire display. Instead, refresh only the small rectangular area where data changes – this greatly reduces processor computation and transfer time.

Use Canvas/Sprite Buffering: Leverage the TFT_eSprite feature in the TFT_eSPI library to render the frame in memory first, then push the entire buffer to the screen in one go using DMA (Direct Memory Access). This completely eliminates visible screen tearing, making scrolling menus and animations flicker-free.

From minor concept tweaks to full custom redesign & development, our engineering team offers end-to-end technical support. Feel free to contact us for custom display demands or technical issues during product selection.