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Multiplexed LED Matrix Circuit Diagrams

Multiplexed LED matrices let you control dozens or hundreds of LEDs with far fewer GPIO pins. This collection shows working circuit diagrams for common driver topologies — including MAX7219, shift-register chains, and Charlieplexing — so you can see how address lines, current-limiting resistors, and power connections come together.

Standard IEEE Std 315 / ANSI Y32.2Engine schematex-circuitExport SVG · PNG · PDF
3 templates
Circuit diagram Multiplexed LED Matrix
4-GPIO Charlieplexed LED Matrix4-GPIO Charlieplexed LED MatrixMultiplexed LED MatrixUse template →Multiplexed LED Matrix DriverMultiplexed LED Matrix DriverMultiplexed LED MatrixUse template →16x16 Bi-Color LED Matrix with MAX7219 and Arduino Nano16x16 Bi-Color LED Matrix with MAX7219 and Arduino NanoMultiplexed LED MatrixUse template →

Nothing close enough? Start from a blank circuit diagram → Describe it in one paragraph.

How to

How to use a circuit diagram template.

  1. 01Choose a matrix and driver

    Pick the LED matrix dimensions (e.g., 8×8, 16×16) and a driver IC that matches your available GPIO count and refresh requirements.

  2. 02Plan the multiplexing scheme

    Decide between row/column scanning, shift registers, or Charlieplexing based on how many pins you can dedicate.

  3. 03Add current limiting and power

    Place current-limiting resistors on each segment or column, and ensure the power supply can handle the peak current of all active LEDs.

  4. 04Wire the control lines

    Connect the driver's data, clock, latch, and enable lines to your microcontroller or controller board.

  5. 05Generate and refine the schematic

    Use the circuit diagram generator to lay out components and nets, then review signal paths and labels before exporting.

FAQ

Questions about circuit diagram templates

What is multiplexing in an LED matrix circuit?

Multiplexing is a technique where LEDs are arranged in a grid and activated one row or column at a time very quickly. This reduces the number of I/O pins needed while making the LEDs appear continuously lit.

How many GPIO pins does a multiplexed LED matrix need?

It depends on the driver and matrix size. A MAX7219 only needs 3 pins (data, clock, load) for an 8×8 matrix, while direct row/column multiplexing needs rows + columns pins. Charlieplexing can control n(n−1) LEDs with n pins.

Can I use an Arduino to drive a 16×16 LED matrix?

Yes. Pair an Arduino with a MAX7219 or shift registers. The Arduino sends serial data to the driver, which handles the high-speed row/column scanning and current control.

What is Charlieplexing and when should I use it?

Charlieplexing uses the tri-state capability of microcontroller pins to control many LEDs with very few pins — n pins can drive up to n(n−1) LEDs. It's best for small matrices where pin count is extremely limited, but it requires careful resistor selection and timing.

Do these circuit diagrams include component values?

The examples show typical connections and logic, but exact resistor and capacitor values depend on your LED forward voltage, desired brightness, and supply voltage. Use the generator to add or adjust component values for your specific setup.