使用MAX7219 Arduino模块的8x8 LED矩阵

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使用MAX7219 Arduino模块的8x8 LED矩阵

在本教程中，我们将学习如何使用MAX7219模块和Arduino控制一个8x8 LED矩阵。MAX7219简化了多个LED的控制，使我们能够轻松显示字符和图案。在这个项目结束时，您将能够在矩阵上显示单词“ROBOJAX”。

为此，我们将使用专门为与 MAX7219 进行接口而设计的 LedControl 库。该库使我们能够以最小的努力将数据发送到 LED 矩阵。如果您想更清楚地了解接线和代码，请务必查看相关视频（视频在 0:30）。

硬件解析

该项目的主要组件包括MAX7219模块和8x8 LED矩阵。MAX7219是一个集成电路，负责管理LED的显示，处理来自Arduino的通信和控制信号。它使用串行接口，这意味着我们可以仅用Arduino的几个引脚控制许多LED。

8x8 LED矩阵由64个单独的LED组成，排列成一个网格。通过MAX7219发送适当的命令，可以打开或关闭每个LED。这使得在矩阵上显示各种字符和图形成为可能。

数据表详情

制造商	美信集成
零件编号	MAX7219
逻辑/IO电压	3.3V 到 5.5V
供电电压	4.0V 到 5.5V
输出电流（每通道）	最大40毫安
峰值电流（每通道）	100 毫安最大
PWM频率指导	100 赫兹
输入逻辑阈值	2.0V（高）/ 0.8V（低）
电压降 / R_DS(开)/ 饱和度	0.2V典型值。
热限制	150°C
包裹	16-DIP
备注 / 变体	共阳极配置

确保适当的电源供应（4.0V至5.5V）。
为每个LED使用限流电阻以防止损坏。
保持接线短，以避免干扰。
监控散热；如有必要，请使用散热器。
仔细检查引脚连接以避免误通信。

接线说明

将MAX7219连接到Arduino，连接以下引脚：

连接VCC将MAX7219的引脚连接到Arduino的5V。
连接GND连接到Arduino的接地。
连接DIN将（数据输入）引脚连接到Arduino引脚12。
连接CLK将（时钟）引脚连接到Arduino引脚11。
连接CS将引脚（芯片选择）连接到Arduino的引脚10。

在通电电路之前，请确保检查所有连接是否牢固。接线很简单，但如果遇到问题，请仔细检查连接（视频中在1:45）。

代码示例与演练

在代码中，我们首先包含了 LedControl 库，这是与 MAX7219 通信所必需的。以下摘录初始化了 LedControl 对象：

LedControl lc=LedControl(12,11,10,1);

这一行设置数据引脚、时钟引脚、芯片选择引脚以及设备数量（在这种情况下为1）。接下来，在setup()我们唤醒MAX7219并设置显示强度：

lc.shutdown(0,false);
lc.setIntensity(0,8);
lc.clearDisplay(0);

这确保了显示器处于活动状态，并准备好显示字符。驱动显示的主要功能是writeArduinoOnMatrix()，依次点亮矩阵的行以显示字母。

演示 / 期待什么

一旦所有连接完成并且代码上传，LED矩阵应该显示“ROBOJAX”这个词。如果显示不正常，请检查松动的连接或错误的引脚分配等问题。此外，请确保电源充足（视频中在2:30）。

章节

介绍 (0:00)
硬件概述 (0:30)
接线说明 (1:45)
代码演示 (2:15)
演示 (3:00)

如果代码不可见，请查看该页面的英文版。对此造成的不便我们深表歉意。

4-8x8 LED matrix using a MAX7219 Arduino module

语言: C++

/*
 * This video shows you how to use the MAX7219 module with an 8x8 LED matrix to display text or any characters on the LED.
 * Watch YouTube video: https://youtu.be/AAiDwBKs9uE
 * 
 * Written by Ahmad Shamshiri for Robojax.com
 * on February 26, 2017 in Ajax, Ontario, Canada
 * Get this code and other Arduino codes from Robojax.com
 * Learn Arduino step by step in a structured course with all materials, wiring diagrams, and libraries
 * all in one place. 
 
 ****************************
 * Get early access to my videos via Patreon and have your name mentioned at the end of every 
 * video I publish on YouTube here: http://robojax.com/L/?id=63 (watch until the end of this video for a list of my Patrons)
 ****************************
 
 * Or make a donation using PayPal http://robojax.com/L/?id=64
 
 * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.
 * This code has been downloaded from Robojax.com
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/
 
 
// We always have to include the library
// Based on a project posted https://github.com/wayoda/LedControl
#include "LedControl.h"
 
 /*
  Now we need a LedControl to work with.
  // Customized for RoboJax.com on February 26, 2017 in Ajax, Ontario, Canada.
  ***** These pin numbers will probably not work with your hardware *****
  pin 12 is connected to the DataIn 
  pin 11 is connected to the CLK 
  pin 10 is connected to CS
  We have only a single MAX72XX.
  */
 LedControl lc=LedControl(12,11,10,1);
 
 /* we always wait a bit between updates of the display */
 unsigned long delaytime=600;
 
 void setup() {
   /*
    The MAX72XX is in power-saving mode on startup,
    we have to do a wakeup call
    */
   lc.shutdown(0,false);
   /* Set the brightness to a medium value */
   lc.setIntensity(0,8);
   /* and clear the display */
   lc.clearDisplay(0);
 }
 
 /*
  This method will display the characters for the
  word "Arduino" one after the other on the matrix. 
  (you need at least 5x7 LEDs to see the whole characters)
  */
 void writeArduinoOnMatrix() {
   /* here is the data for the characters */
 
   // K
   byte R[8]={B11111100,B10000100,B10000100,B11111000,B10100000,B10010000,B10001000,B10000100};
   byte O[8]={B00011000,B00100100,B01000010,B01000010,B01000010,B01000010,B00100100,B00011000};  
   byte B[8]={B11111100,B10000100,B10000100,B11111000,B10001000,B10000100,B10000100,B11111100};
   byte J[8]={B00011110,B00000100,B00000100,B00000100,B10000100,B10000100,B01000100,B00111000};
   byte A[8]={B00111000,B01000100,B10000010,B11111110,B10000010,B10000010,B10000010,B10000010};     
   byte X[8]={ B10000001,B01000010,B00100100,B00011000,B00011000,B00100100,B01000010,B10000001};
   byte love[8]={ B00000000,B01100110,B10011001,B10011001,B10000001,B01000010,B00100100,B00011000};  
 
 
   /* Letter R */
   for (int i=0; i<8; i++){
   lc.setRow(0,i,R[i]);
 
   }
    
   delay(delaytime);
   for(int i=0; i<8; i++){
       lc.setRow(0,i,0);// this is for blank
   }  
 //////////////// END of Letter R ///////
 
   /* Letter O */
   for (int i=0; i<8; i++){
   lc.setRow(0,i,O[i]);
 
   }
    
   delay(delaytime);
   for(int i=0; i<8; i++){
       lc.setRow(0,i,0);// this is for blank
   }  
 //////////////// END of Letter O ///////
 
 
   /* Letter B */
   for (int i=0; i<8; i++){
   lc.setRow(0,i,B[i]);
 
   }
    
   delay(delaytime);
   for(int i=0; i<8; i++){
       lc.setRow(0,i,0);// this is for blank
   }  
 //////////////// END of Letter B ///////
 
   /* Letter O */
   for (int i=0; i<8; i++){
   lc.setRow(0,i,O[i]);
 
   }
    
   delay(delaytime);
   for(int i=0; i<8; i++){
       lc.setRow(0,i,0);// this is for blank
   }  
 //////////////// END of Letter O ///////
 
   /* Letter J */
   for (int i=0; i<8; i++){
   lc.setRow(0,i,J[i]);
 
   }
    
   delay(delaytime);
   for(int i=0; i<8; i++){
       lc.setRow(0,i,0);// this is for blank
   }  
 //////////////// END of Letter J ///////
 
   /* Letter A */
   for (int i=0; i<8; i++){
   lc.setRow(0,i,A[i]);
 
   }
    
   delay(delaytime);
   for(int i=0; i<8; i++){
       lc.setRow(0,i,0);// this is for blank
   }  
 //////////////// END of Letter A ///////
 
   /* Letter X */
   for (int i=0; i<8; i++){
   lc.setRow(0,i,X[i]);
 
   }
    
   delay(delaytime);
   for(int i=0; i<8; i++){
       lc.setRow(0,i,0);// this is for blank
   }  
 //////////////// END of Letter X ///////
 
 
 
   /* love */
   for (int i=0; i<8; i++){
   lc.setRow(0,i,love[i]);
 
   }
    
   delay(delaytime);
   delay(delaytime);
   for(int i=0; i<8; i++){
       lc.setRow(0,i,0);// this is for blank
   }  
 //////////////// END of Letter love ///////
 
 }// writeArduinoOnMatrix()  end
 
 
 void loop() { 
   writeArduinoOnMatrix();
 
 }

5-8x8 LED Matrix using a MAX7219 Arduino Module

语言: C++

/*
 * 这段视频向您展示如何使用MAX7219模块与8x8 LED矩阵在LED上显示文本或任何字符。  
 * 观看YouTube视频：https://youtu.be/AAiDwBKs9uE  
 * 
 * 由Ahmad S.为Robojax.com撰写  
 * 于2017年2月26日在加拿大安大略省Ajax  
 * 授权共享此代码，前提是保留此备注。  
 * 免责声明：此代码为“按原样”，仅用于教育目的。  
 * 
 * /  
 * 
 * // 我们始终需要包含库  
 * // 基于发布在https://github.com/wayoda/LedControl上的项目
 */
#include "LedControl.h"

/*
 * Now we need a LedControl object to work with.
 *  // Customized for RoboJax.com on February 26, 2017 in Ajax, Ontario, Canada.
 * **** These pin numbers will probably not work with your hardware *****
 *  pin 1 is connected to the DataIn 
 *  pin 4 is connected to the CLK 
 *  pin 53 is connected to CS
 *  We have only a single MAX72XX.
 */
LedControl lc=LedControl(1,4,53,1); // this line determines if this code can work with Arduino Mega or Arduino UNO

/*
 * we always wait a bit between updates of the display */
 * unsigned long delaytime=600;
 * 
 * void setup() {
 *   /*
 *    The MAX72XX is in power-saving mode on startup,
 *    we have to do a wakeup call
 */
  lc.shutdown(0,false);
/*
 * Set the brightness to a medium value */
 *   lc.setIntensity(0,8);
 *   /* and clear the display
 */
  lc.clearDisplay(0);
}

/*
 * This method will display the characters for the
 *  word "Arduino" one after the other on the matrix. 
 *  (you need at least 5x7 LEDs to see the whole characters)
 */
void writeArduinoOnMatrix() {
/*
 * here is the data for the characters */
 * 
 *   // K
 *   byte R[8]={B11111100,B10000100,B10000100,B11111000,B10100000,B10010000,B10001000,B10000100};
 *   byte O[8]={B00011000,B00100100,B01000010,B01000010,B01000010,B01000010,B00100100,B00011000};  
 *   byte B[8]={B11111100,B10000100,B10000100,B11111000,B10001000,B10000100,B10000100,B11111100};
 *   byte J[8]={B00011110,B00000100,B00000100,B00000100,B10000100,B10000100,B01000100,B00111000};
 *   byte A[8]={B00111000,B01000100,B10000010,B11111110,B10000010,B10000010,B10000010,B10000010};     
 *   byte X[8]={ B10000001,B01000010,B00100100,B00011000,B00011000,B00100100,B01000010,B10000001};
 *   byte love[8]={ B00000000,B01100110,B10011001,B10011001,B10000001,B01000010,B00100100,B00011000};  
 * 
 * 
 *   /* Letter R
 */
  for (int i=0; i<8; i++){
  lc.setRow(0,i,R[i]);

  }

  delay(delaytime);
  for(int i=0; i<8; i++){
      lc.setRow(0,i,0); // this is for blank
  }
 // ///////////// END of Letter R ///////

/*
 * Letter O */
 *   for (int i=0; i<8; i++){
 *   lc.setRow(0,i,O[i]);
 * 
 *   }
 *    
 *   delay(delaytime);
 *   for(int i=0; i<8; i++){
 *       lc.setRow(0,i,0);// this is for blank
 *   }  
 * /////////////// END of Letter O ///////
 * 
 * 
 *   /* Letter B
 */
  for (int i=0; i<8; i++){
  lc.setRow(0,i,B[i]);

  }

  delay(delaytime);
  for(int i=0; i<8; i++){
      lc.setRow(0,i,0); // this is for blank
  }
 // ///////////// END of Letter B ///////

/*
 * Letter O */
 *   for (int i=0; i<8; i++){
 *   lc.setRow(0,i,O[i]);
 * 
 *   }
 *    
 *   delay(delaytime);
 *   for(int i=0; i<8; i++){
 *       lc.setRow(0,i,0);// this is for blank
 *   }  
 * /////////////// END of Letter O ///////
 * 
 *   /* Letter J
 */
  for (int i=0; i<8; i++){
  lc.setRow(0,i,J[i]);

  }

  delay(delaytime);
  for(int i=0; i<8; i++){
      lc.setRow(0,i,0); // this is for blank
  }
 // ///////////// END of Letter J ///////

/*
 * Letter A */
 *   for (int i=0; i<8; i++){
 *   lc.setRow(0,i,A[i]);
 * 
 *   }
 *    
 *   delay(delaytime);
 *   for(int i=0; i<8; i++){
 *       lc.setRow(0,i,0);// this is for blank
 *   }  
 * /////////////// END of Letter A ///////
 * 
 *   /* Letter X
 */
  for (int i=0; i<8; i++){
  lc.setRow(0,i,X[i]);

  }

  delay(delaytime);
  for(int i=0; i<8; i++){
      lc.setRow(0,i,0); // this is for blank
  }
 // ///////////// END of Letter X ///////

资源与参考

文档
查看SPI的不同电路板引脚分配设置
arduino.cc
外部
从GitHub下载库。Arduino的8x8 LED矩阵库。
github.com
内部
字符或文本的二进制编码生成器

文件📁

没有可用的文件。

使用MAX7219 Arduino模块的8x8 LED矩阵