有没有可能使用普通阳极配置以正方形的形式照亮5 * 5矩阵中的led

时间:2019-10-23 10:41:23

标签: c arduino ide

我有一个led矩阵,它在行方向是公共阳极,在列方向是公共阴极。我需要以正方形的形状发光矩阵(第一行&&最后一行&&第一列&&最后一列),但是我无法做到这一点。我能够分别显示第一行和最后一行以及第一列和第二列)

void first_last_row();
void first_last_column();

int Led_Row_Pins[] = { 2 , 3 , 4 , 5 , 6 } ;             //   Anode pins are shorted in row_wise_manner
int Led_Column_Pins[] = {8  , 9 , 10 , 11 , 12} ;          //   Column Pins are shorted in column_wise_manner   
int Loop_Count = 5 ;
int Wait_Time_On = 1000 ;
int Wait_Time_Off = 500 ;
int i = 0 ;
int j = 0 ;
int state = 1 ;

void setup() {
  for( i = 0 ; i < Loop_Count ; i++ ){     // Anode Pins are connected in row_wise manner and are made LOW so that they dont conduct       
    pinMode(Led_Row_Pins[i],OUTPUT);
    digitalWrite(Led_Row_Pins[i],LOW);
    pinMode(Led_Column_Pins[i],OUTPUT);    // Cathode Pins are connected in column_wise manner and are made HIGH so that they dont conduct
    digitalWrite(Led_Column_Pins[i],HIGH); 
  }
}

void loop() { 
      first_last_row();
      delay(1000);
      first_last_column();
}


void first_last_row()
{
  for( i = 0 ; i < Loop_Count ; i++ )// Led First And Last Row 
   {
     for( j = 0 ; j < Loop_Count ; j++)
     {
       if( i == 0 || i == 4 )
       {
         digitalWrite(Led_Row_Pins[i],state); //Led_On_State
         digitalWrite(Led_Column_Pins[j],!state);
       }
     }
   }
}


void first_last_column()
{

  for( j = 0 ; j < Loop_Count ; j++ )// Led First And Last Column
   {
     for( i = 0 ; i < Loop_Count ; i++)
     {
       if( j == 0 || j == 4 )
       {
        digitalWrite(Led_Row_Pins[i],state);//    Led_On_State
        digitalWrite(Led_Column_Pins[j],!state);
       }
     }
   }
}

我需要第一行和最后一行以及第一列和最后一列led发光在一起,以便形成正方形,但是我只能分别发光第一行和最后一行以及第一列和最后一个发光列。

1 个答案:

答案 0 :(得分:2)

在您的特定情况下,您可以打开第一行和最后一行,例如1毫秒,然后打开第一列和最后一列1毫秒,然后重复此步骤。我进一步建议在打开新图案之前先关闭所有LED。

void loop() { 
      static int show_rows = 0;

      switch_all_off();
      if(show_rows) {
          first_last_row();
      } else {
          first_last_column();
      }
      show_rows = !show_rows;
      delay(10);
}

void switch_all_off()
{
    int off = 0;
    for( j = 0 ; j < Loop_Count ; j++ )
    {
          digitalWrite(Led_Row_Pins[i],off);
          digitalWrite(Led_Column_Pins[j],!off);
    }
}

通过第一步,行和列中包含的LED将更亮。要解决此问题,您可以从行或列中排除角LED,例如

void first_last_column()
{

    for( j = 0 ; j < Loop_Count ; j++ )// Led First And Last Column
    {
        for( i = 0 ; i < Loop_Count ; i++)
        {
            if((i != 0) && (i != 4) && ( j == 0 || j == 4 ))
            {
                digitalWrite(Led_Row_Pins[i],state);//    Led_On_State
                digitalWrite(Led_Column_Pins[j],!state);
            }
        }
    }
}

要获得更通用的解决方案,您必须遍历各行,依次激活另一行,并根据需要切换当前行的列引脚。

#define MAXLEDS 5
int states[MAXLEDS][MAXLEDS] = {
    { 1, 0, 0, 0, 1 },
    { 0, 1, 0, 1, 0 },
    { 0, 0, 1, 0, 0 },
    { 0, 1, 0, 1, 0 },
    { 1, 0, 0, 0, 1 }
};

void switch_leds(int row) {
    int i;

    /* switch off all rows */
    for(i = 0; i < MAXLEDS, i++) {
        digitalWrite(Led_Row_Pins[i], 0);
    }

    /* switch columns according to current row */
    for(i = 0; i < MAXLEDS; i++) {
        digitalWrite(Led_Column_Pins[i], !states[row][i]);
    }

    /* switch on current row */
    digitalWrite(Led_Row_Pins[row], 1);

}

void loop() { 
    static int row = 0;
    /* switch on LEDs in a single row */
    switch_leds(row);
    /* next row */
    row++; row %= MAXLEDS;
    /* The processing delay between calls to loop() is added to this delay. */
    delay(5);
}

所有代码示例都未经测试,可能包含错误。