Arduino with Serially Interfaced MAX7219 Operates 8X8 LED Matrix

Related YouTube video for this project: Arduino DS1307 RTC Clock with MAX7219 LED Display Controller

The following demonstrates the use of the MAX7219 display driver with a Arduino Microcontroller. This sample code move an arrow across a 8X8 LED matrix. These units are inexpensive and sold by several vendors on Ebay for under $5. This code was ported over from my PIC18F2550 pages and was designed to work on either micro-controller without the use of other user libraries. This makes the code more portable.

This demo operates in the non-decode mode.

The MAX7219 is a serial input/output common-cathode display driver that interfaces microprocessors to a 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs.

First the address (0x00 - 0x0f) is clocked in by ssrWrite(), then the data or command byte is clocked in.

Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8x8 static RAM that stores each digit. Only one external resistor is required to set the segment current for all LEDs.

A convenient 4-wire serial interface connects to all common uPs. Individual digits may be addressed and updated without rewriting the entire display. The MAX7219 will also allow the user to select code- B decoding or no-decode for each digit.

The devices include a 150uA low-power shutdown mode, analog and digital brightness control, a scan limit register that allows the user to display from 1 to 8 digits, and a test mode that forces all LEDs on.

Arduino code for this project: arduino_max7219a.txt.

• Related:
• Arduino RTC Clock with MAX7219 8-Digit LED Display
• BCD Conversion with Arduino Displayed on MAX7219

• Raspberry Pi Python RTC Interface MAX7219 Display Driver
• Raspberry Pi Interfacing 8-Digit LED MAX7219 Display Driver

• Quick navigation of this website:
• Basic Electronics Learning and Projects
• Basic Solid State Component Projects
• Arduino Microcontroller Projects
• Raspberry Pi Electronics, Programming

Stepper Motors

• Easy Driver Micro-Stepper Controller to Arduino
• Unipolar Stepper Motor with a Arduino
• Considerations for Using Stepper Motors
• Connecting the Arduino to a L298N H-Bridge
• L298N Motor Controller Theory and Projects
• TA8050 H-Bridge Motor Controller

• Rotary Encoder Using Arduino Hardware Interrupts

• Battery Charger related:
• Solar Panel Charge Controller Using Arduino
• Solar Panel Battery Charge Controller Using Arduino
• Solar Panel Battery Charge Controller Switching Circuit

• Arduino AC Power Control Tutorial
• Rotary Encoder Using Arduino Hardware Interrupts
• Arduino Controlling 74C164 Shift Register
• Arduino Interface MC3479 Stepper Motor Controller

Serial LCD Display and assorted Sensors

• Arduino LCD Display using 74164 Shift Register
• Arduino LCD Display with DS18B20
• Arduino LCD Display with DHT11 Sensor

• Arduino with MM5451 LED Display Driver
• Arduino MAX7219 Operates 8X8 LED Matrix
• Arduino RTC Clock MAX7219 LED Display
• BCD Conversion with MAX7219

• Hatching Chicken Eggs with Arduino
• Arduino TMP37 Temperature Sensor
• Arduino TMP37 Temperature Sensor Tutorial
• The following use obsolete parts and are kept as a reference.
• Testing the Keyes IR Sensor Module with Arduino
• Arduino to MCP23016, LCD Display
• Time-Date with Arduino, LCD Display, DS1307 RTC
• Controlling Driveway Lights with the Arduino
• TSL230R Light to Frequency Converter
• Arduino with MCP23016 I/O Expander
• Arduino DS1307 Real Time Clock
• Arduino with 24LC08 Serial EEPROM
• MC3479 Stepper Motor Controller with Arduino

Web site Copyright Lewis Loflin, All rights reserved.
If using this material on another site, please provide a link back to my site.