Arduino Project 020 - LED Dot Matrix Display - Beat Heart
You’re going to use the same circuit, but with a slight variation in the code to create a multi-frame animation that also scrolls from right to left. In doing so, you will be introduced to the concept of multidimensional arrays. You’ll also learn a little trick to get bitwise rotation (or circular shift). To start, you’ll use the exact same circuit as in Project 19.
Project 20 – LED Dot Matrix Display – Beating Heart
/* Coding Ron Wang Oct.1st 2024 Autaba support for coding hardware Project 20 LED Dot Matrix – Beating Heat */ 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 = 11; // data in pin int CS_PIN = 8; // load (CS) pin int CLK_PIN = 12; // 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 } }
Project 20 – LED Dot Matrix Display – Animation Heart
/* Coding Ron Wang Oct.2nd 2024 Autaba support for coding hardware Project 20 LED Dot Matrix – Animation Heart */ unsigned char i; unsigned char j; int Max7219_pinCLK = 11; int Max7219_pinCS = 10; int Max7219_pinDIN = 12; unsigned char disp1[19][8]={ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Heart Pattern 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x40, 0x40, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x40, 0x40, 0x00, 0x00, 0x00, 0x40, 0x80, 0x80, 0x40, 0x40, 0x00, 0x00, 0x00, 0x60, 0x80, 0x80, 0x40, 0x40, 0x00, 0x00, 0x00, 0x60, 0x90, 0x80, 0x40, 0x40, 0x00, 0x00, 0x00, 0x60, 0x90, 0x88, 0x40, 0x40, 0x00, 0x00, 0x00, 0x60, 0x90, 0x88, 0x44, 0x40, 0x00, 0x00, 0x00, 0x60, 0x90, 0x88, 0x44, 0x44, 0x00, 0x00, 0x00, 0x60, 0x90, 0x88, 0x44, 0x44, 0x08, 0x00, 0x00, 0x60, 0x90, 0x88, 0x44, 0x44, 0x08, 0x10, 0x00, 0x60, 0x90, 0x88, 0x44, 0x44, 0x08, 0x10, 0x20, 0x60, 0x90, 0x88, 0x44, 0x44, 0x08, 0x10, 0x60, 0x60, 0x90, 0x88, 0x44, 0x44, 0x08, 0x90, 0x60, 0x60, 0x90, 0x88, 0x44, 0x44, 0x88, 0x90, 0x60, // Heart Pattern }; void Write_Max7219_byte(unsigned char DATA) { unsigned char i; digitalWrite(Max7219_pinCS,LOW); for(i=8;i>=1;i--) { digitalWrite(Max7219_pinCLK,LOW); digitalWrite(Max7219_pinDIN,DATA&0x80); DATA = DATA<<1; digitalWrite(Max7219_pinCLK,HIGH); } } void Write_Max7219(unsigned char address,unsigned char dat) { digitalWrite(Max7219_pinCS,LOW); Write_Max7219_byte(address); Write_Max7219_byte(dat); digitalWrite(Max7219_pinCS,HIGH); } void Init_MAX7219(void) { Write_Max7219(0x09, 0x00); Write_Max7219(0x0a, 0x03); Write_Max7219(0x0b, 0x07); Write_Max7219(0x0c, 0x01); Write_Max7219(0x0f, 0x00); } void setup() { pinMode(Max7219_pinCLK,OUTPUT); pinMode(Max7219_pinCS,OUTPUT); pinMode(Max7219_pinDIN,OUTPUT); delay(50); Init_MAX7219(); } void loop() { for(j=0;j<19;j++) { for(i=1;i<9;i++) Write_Max7219(i,disp1[j][i-1]); delay(500); } }
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