The **FYA-R2820ZX** is a high-performance **2.0-inch 5x8 Dot Matrix LED Display** module. These components are widely used for displaying alphanumeric characters, custom symbols, and simple graphics in industrial and consumer electronics. --- ### 1. Technical Specifications The following table outlines the primary electrical and physical characteristics typical for this series: | Parameter | Specification | | :--- | :--- | | **Matrix Configuration** | 5 columns x 8 rows (40 Dots total) | | **Dot Diameter** | 5.0 mm | | **Display Height** | 2.0 inches (50.8 mm) | | **Surface Color** | Usually Black or Grey | | **Connection Type** | Through-hole (DIP) | | **Common Pinout** | Common Cathode or Common Anode | --- ### 2. Electronic Structure The internal circuitry consists of 40 individual Light Emitting Diodes (LEDs) arranged in a grid. * **Multiplexing:** To save on pin counts, the LEDs are connected in a matrix. Instead of 80 pins (2 for each LED), the device typically uses 13 pins (5 for columns + 8 for rows). * **Polarity:** * **Common Anode:** All LED anodes in a row/column are tied together. * **Common Cathode:** All LED cathodes in a row/column are tied together. * **Color Variants:** The "ZX" suffix often denotes the specific color (e.g., Red, Green, or Yellow) and brightness level. --- ### 3. Pin Configuration and Driving To operate the FYA-R2820ZX, you must use a technique called **Multiplexing**. #### Driving Logic: 1. **Row Scanning:** Apply power to one row at a time. 2. **Column Control:** Activate the specific columns for the dots you want to light up in that row. 3. **High Frequency:** Switch between rows faster than 60Hz to create the illusion of a steady image (Persistence of Vision). #### Recommended Components for Interfacing: * **Current Limiting Resistors:** Essential to prevent burning out the LEDs (typically 220Ω to 470Ω). * **Driver ICs:** Often used with shift registers like the **74HC595** or dedicated LED drivers like the **MAX7219** to reduce the number of microcontroller pins required. --- ### 4. Key Applications * **Elevator Floor Indicators:** Displaying numbers and arrows. * **Industrial Control Panels:** Showing status codes or simple sensor data. * **Information Boards:** Scrolling text displays. * **Clocks and Timers:** Large format digital timekeeping.