Here is the panel when it is powered on and the code is uploaded:
https://imgur.com/a/TXgP0E8
Here is the code:
Code: Select all
// colorwheel demo for Adafruit RGBmatrixPanel library.
// Renders a nice circle of hues on our 32x32 RGB LED matrix:
// http://www.adafruit.com/products/607
// Written by Limor Fried/Ladyada & Phil Burgess/PaintYourDragon
// for Adafruit Industries.
// BSD license, all text 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 11 // 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
}