Robo România

Beating heart Arduino MAX7219 8×8 LED matrix

Acesta este un proiect foarte simplu pentru a afișa o inimă care bate cu o placă Arduino și o matrice LED de 8×8 cu driver MAX7219

Cablarea este foarte simplă :

PIN MAX7219 VCC> Arduino pin 5V

PIN MAX7219 GND> Arduino pin GND

PIN MAX7219 DIN> Arduino pin 2

PIN MAX7219 CS> Arduino pin 3

PIN MAX7219 CLOCK> Arduino pin 4

Sketch-ul Arduino nu folosește nicio bibliotecă, deci este bine să înțelegeți cum să lucrați direct cu cipul MAX7219 prin registre (through registers).

Cod :

//–––––––––––––-

int ANIMDELAY = 100;  // animation delay, deafault value is 100
int INTENSITYMIN = 0; // minimum brightness, valid range [0,15]
int INTENSITYMAX = 8; // maximum brightness, valid range [0,15]

int DIN_PIN = 2;      // data in pin
int CS_PIN = 3;       // load (CS) pin
int CLK_PIN = 4;      // clock pin

// MAX7219 registers
byte MAXREG_DECODEMODE = 0x09;
byte MAXREG_INTENSITY  = 0x0a;
byte MAXREG_SCANLIMIT  = 0x0b;
byte MAXREG_SHUTDOWN   = 0x0c;
byte MAXREG_DISPTEST   = 0x0f;

const unsigned char heart[] =
{
  B01100110,
  B11111111,
  B11111111,
  B11111111,
  B01111110,
  B00111100,
  B00011000,
  B00000000
};



void setup ()
{
  pinMode(DIN_PIN, OUTPUT);
  pinMode(CLK_PIN, OUTPUT);
  pinMode(CS_PIN, OUTPUT);

  // initialization of the MAX7219
  setRegistry(MAXREG_SCANLIMIT, 0x07);
  setRegistry(MAXREG_DECODEMODE, 0x00);  // using an led matrix (not digits)
  setRegistry(MAXREG_SHUTDOWN, 0x01);    // not in shutdown mode
  setRegistry(MAXREG_DISPTEST, 0x00);    // no display test
  setRegistry(MAXREG_INTENSITY, 0x0f & INTENSITYMIN);

  // draw hearth
  setRegistry(1, heart[0]);
  setRegistry(2, heart[1]);
  setRegistry(3, heart[2]);
  setRegistry(4, heart[3]);
  setRegistry(5, heart[4]);
  setRegistry(6, heart[5]);
  setRegistry(7, heart[6]);
  setRegistry(8, heart[7]);
}


void loop ()
{
  // second beat
  setRegistry(MAXREG_INTENSITY, 0x0f & INTENSITYMAX);
  delay(ANIMDELAY);
  
  // switch off
  setRegistry(MAXREG_INTENSITY, 0x0f & INTENSITYMIN);
  delay(ANIMDELAY);
  
  // second beat
  setRegistry(MAXREG_INTENSITY, 0x0f & INTENSITYMAX);
  delay(ANIMDELAY);
  
  // switch off
  setRegistry(MAXREG_INTENSITY, 0x0f & INTENSITYMIN);
  delay(ANIMDELAY*6);
}


void setRegistry(byte reg, byte value)
{
  digitalWrite(CS_PIN, LOW);

  putByte(reg);   // specify register
  putByte(value); // send data

  digitalWrite(CS_PIN, LOW);
  digitalWrite(CS_PIN, HIGH);
}

void putByte(byte data)
{
  byte i = 8;
  byte mask;
  while (i > 0)
  {
    mask = 0x01 << (i - 1);        // get bitmask
    digitalWrite( CLK_PIN, LOW);   // tick
    if (data & mask)               // choose bit
      digitalWrite(DIN_PIN, HIGH); // send 1
    else
      digitalWrite(DIN_PIN, LOW);  // send 0
    digitalWrite(CLK_PIN, HIGH);   // tock
    --i;                           // move to lesser bit
  }
}
//---------------------------------

is work bro...