Example Code for Arduino-A color filled circle

Hardware Preparation

• DFRduino UNO R3 x1
• DFR0499 x1
• DuPont cables

Software Preparation

• Arduino IDE Click to Download Arduino IDE from Arduino®
• Adafruit-GFX-Library
• RGB-matrix-Panel
• How to install the library?

Wiring Diagram

Note: It needs an external power supply, the USB is only 5V@500mA, not enough power.

Other Preparation Work

Control signal pin connected to MEGA2560:
R1-> 24 G1-> 25 B1-> 26
R2-> 27 G2-> 28 B2-> 29
HA-> A0 HB-> A1 HC-> A2 HD-> A3 HE-> A4
OE-> 9 LAT-> 10 CLK-> 11
GND-> GND
Power Interface:
-5V -> +5V DC power supply positive
-5V -> +5V DC power supply positive
GND-> DC power supply negative
GND-> DC power supply negative

Sample Code

/***************************************************
*
* For 32x32 RGB LED matrix.
*
* @author lg.gang
* @version  V1.0
* @date  2016-10-28
*
* GNU Lesser General Public License.
* See <http://www.gnu.org/licenses/> for details.
* All above must be included in any redistribution
* ****************************************************/

#include <Adafruit_GFX.h>   // Core graphics library
#include <RGBmatrixPanel.h> // Hardware-specific library

// If your 32x32 matrix has the SINGLE HEADER input,
// use this pinout:
#define CLK 8  // MUST be on PORTB! (Use pin 11 on Mega)
#define OE  9
#define LAT 10
#define A   A0
#define B   A1
#define C   A2
#define D   A3
// If your matrix has the DOUBLE HEADER input, use:
//#define CLK 8  // MUST be on PORTB! (Use pin 11 on Mega)
//#define LAT 9
//#define OE  10
//#define A   A3
//#define B   A2
//#define C   A1
//#define D   A0
RGBmatrixPanel matrix(A, B, C, D, CLK, LAT, OE, false);

void setup() {
  int      x, y, hue;
  float    dx, dy, d;
  uint8_t  sat, val;
  uint16_t c;

  matrix.begin();

  for(y=0; y < matrix.width(); y++) {
    dy = 15.5 - (float)y;
    for(x=0; x < matrix.height(); x++) {
      dx = 15.5 - (float)x;
      d  = dx * dx + dy * dy;
      if(d <= (16.5 * 16.5)) { // Inside the circle(ish)?
        hue = (int)((atan2(-dy, dx) + PI) * 1536.0 / (PI * 2.0));
        d = sqrt(d);
        if(d > 15.5) {
          // Do a little pseudo anti-aliasing along perimeter
          sat = 255;
          val = (int)((1.0 - (d - 15.5)) * 255.0 + 0.5);
        } else
        {
          // White at center
          sat = (int)(d / 15.5 * 255.0 + 0.5);
          val = 255;
        }
        c = matrix.ColorHSV(hue, sat, val, true);
      } else {
        c = 0;
      }
      matrix.drawPixel(x, y, c);
    }
  }
}

void loop() {
  // do nothing
}

Result

A color filled circle