Connect the components as shown in the circuit diagram. The aim of the project is to interface an Arduino Uno board with an 8 x 8 LED matrix to display information.Įven though a single 8 x 8 LED matrix with corresponding MAX 7219 IC is used in this project, multiple LED matrices can be connected in series for long scrolling display. Pre-wired MAX 7219 and 8 x 8 LED matrix modules are available in the market. The 8 x 8 LED matrix is connected to the MAX 7219 as shown in the circuit diagram and the data input is received from the Arduino board to the MAX 7219. It is used to interface microprocessors and microcontrollers with 64 individual LEDs (8 x 8 LED matrix for example has 64 LEDs), seven segment LED displays up to 8 digits or bar graph displays. MAX 7219 is a common cathode display driver with serial input and parallel output. They are parallel (where each row or column are sent with parallel data) and serial (where the data is sent serially and an IC is used to convert this serial data into parallel data). The LED matrix can be driven in two ways. While developing the project, the type of LED matrix must be known and the program must be written accordingly. The LED matrix used in this project is a common row cathode type LED matrix. In case of common row cathode type LED matrix, the current sources (high or positive voltage) are given to the columns 1-4 and the current sinks (low or negative voltage or ground) are given to the rows A-D. In case of common row anode type LED matrix, the current sources (high or positive voltage) are given to the rows A-D and the current sinks (low or negative voltage or ground) are given to the columns 1-4. Based on the arrangement of the LEDs in the matrix, an LED matrix can be either common row anode or common row cathode. They are also available in different dimensions like 5 x 7, 8 x 8, 16 x 16, 32 x 32 etc. LED matrices are available in different styles like single color, dual color, multi-color or RGB LED matrix.

LED MatrixĪn 8 x 8 LED matrix display is used in this project to display the information. The corresponding pins must be appropriately mentioned in the program. One pin provides the clock signal to the LED display driver IC (MAX 7219) while another pin is used to transmit the serial data to the IC for displaying on the LED matrix. Out of the 14 available digital input / output pins on the Arduino Uno, we need only three pins to implement this project. The project is based on the Arduino Uno microcontroller board. Project 1: Simple Arduino LED Matrix Interface Circuit Diagram

Controlling 8×8 LED Matrix through Android App.

Project 2: Arduino 8X8 LED Matrix Interface with Android Phone.Project 1: Simple Arduino LED Matrix Interface.

Max7219 led display proteus library