馴龍窩

今天撥空弄了一個小玩具，就是可以用遙控器選擇顯示內容的點矩陣小螢幕

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功能介紹:

利用遙控器，按下不同按鈕，即可切換不同的字串，顯示在矩陣螢幕上

硬體接法:

//-----HW setup----------
//IR接收器一個: VS1838B ,MAX7219 8x8 8
//--VS1838B-
//pin2: 連接 VS1838B OUT pin
//GND: 連接 VS1838B GND pin
//5V: 連接 VS1838B VCC pin
//-----MAX7219--SPI-------
//VCC: 5V
//GND: GND
//DOUT: Pin 11
//CS: Pin3
//CLK: Pin13
//---end of HW setup---

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MD_parola API詳述:

https://majicdesigns.github.io/MD_Parola/class_m_d___parola.html

效果影片:

https://youtu.be/DiugfAFBosA

程式碼:

/* Example code for scrolling text effect on MAX7219 LED dot matrix display with Arduino. More info: https://www.makerguides.com */

#include <IRremote.h>
#include <IRremoteInt.h>

// Include the required Arduino libraries:
#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <SPI.h>

// Define hardware type, size, and output pins:
#define HARDWARE_TYPE MD_MAX72XX::FC16_HW
#define MAX_DEVICES 8  // how many 8x8 led combind
#define CS_PIN 3   // CS pin
//---IRremote key code
#define key_1 0xFF30CF
#define key_2 0xFF18E7
#define key_3 0xFF7A85
#define key_4 0xFF10EF
#define key_5 0xFF38C7
#define key_6 0xFF5AA5

// Create a new instance of the MD_Parola class with hardware SPI connection:
MD_Parola myDisplay = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);

// Setup for software SPI:
// #define DATA_PIN 2
// #define CLK_PIN 4
// MD_Parola myDisplay = MD_Parola(HARDWARE_TYPE, DATA_PIN, CLK_PIN, CS_PIN, MAX_DEVICES);

//scrolling parameters
uint16_t scrollSpeed = 30;
uint16_t scrollPause = 2000;
textPosition_t scrollAlign = PA_CENTER;
textEffect_t scrollEffect = PA_SCROLL_LEFT;

#define  BUF_SIZE  75
char key_1_Message[BUF_SIZE] = { "Work hard,play hard.Practice makes perfect." };
char key_2_Message[BUF_SIZE] = { "No pain,no gain.The first step is always the hardest." };
char key_3_Message[BUF_SIZE] = { "Winners do what losers do not want to do." };
char key_4_Message[BUF_SIZE] = { "Failure is the mother of success." };
char key_5_Message[BUF_SIZE] = { "Never underestimate your power to change yourself!" };
char key_6_Message[BUF_SIZE] = { "Never put off what you can do today until tomorrow." };
char newMessage[BUF_SIZE] = { "Hang on to your dreams." };

//---define for IRremote
 const int irReceiverPin = 2;
  IRrecv irrecv(irReceiverPin);    // 初始化紅外線訊號輸入
  decode_results results;    // 儲存訊號的結構
//--

void ir_rec(){
  if (irrecv.decode(&results)) { // 接收紅外線訊號並解碼
    Serial.print("results value is "); // 輸出解碼後的資料
    Serial.print(results.value, HEX);
    Serial.print(", bits is ");
    Serial.print(results.bits);
    Serial.print(", decode_type is ");
    Serial.println(results.decode_type);
    switch(results.value){
      case key_1:
        Serial.println("case key_1 ");
        strcpy(newMessage,key_1_Message);
        myDisplay.displayClear();
        myDisplay.displayReset();
        break;
      case key_2:
        strcpy(newMessage,key_2_Message);
        myDisplay.displayClear();
        myDisplay.displayReset();
        break;
      case key_3:
        strcpy(newMessage,key_3_Message);
        myDisplay.displayClear();
        myDisplay.displayReset();
        break;
      case key_4:
        strcpy(newMessage,key_4_Message);
        myDisplay.displayClear();
        myDisplay.displayReset();
        break;
     case key_5:
        strcpy(newMessage,key_5_Message);
        myDisplay.displayClear();
        myDisplay.displayReset();
        break;
     case key_6:
        strcpy(newMessage,key_6_Message);
        myDisplay.displayClear();
        myDisplay.displayReset();
        break;                
    }
    irrecv.resume(); // 準備接收下一個訊號
  }  
}

void setup() {
  Serial.begin(9600);  // for Serial.print
  irrecv.enableIRIn(); // 啟動接收
  // Intialize the object:
  myDisplay.begin();
  // Set the intensity (brightness) of the display (0-15):
  myDisplay.setIntensity(0);
  // Clear the display:
  myDisplay.displayClear();
  //displayText (const char *pText, textPosition_t align, uint16_t speed, uint16_t pause, textEffect_t effectIn, textEffect_t effectOut=PA_NO_EFFECT)
  myDisplay.displayText(newMessage, scrollAlign, scrollSpeed, scrollPause,  scrollEffect ,  scrollEffect );
  //displayScroll (const char *pText, textPosition_t align, textEffect_t effect, uint16_t speed)
  //myDisplay.displayScroll("Mark,On Line!",PA_CENTER,PA_SCROLL_LEFT,50);
  //myDisplay.setInvert(true);
}

void loop() {

   ir_rec();
   
  if (myDisplay.displayAnimate()) {
     myDisplay.displayReset();
    
  }
}

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以上作紀錄，方便日後參考。