This circuit is designed to control a series of WS2812 RGB LED matrices using an Arduino UNO. The circuit includes power regulation, signal conditioning, and control logic to drive the LED matrices. The Arduino UNO is programmed to generate patterns on the LED matrices.
2.1mm Barrel Jack with Terminal Block
Electrolytic Capacitor
WS2812 RGB LED matrix 8x8
Resistor (330 Ohms)
Arduino UNO
POS connected to:
NEG connected to:
+ connected to:
- connected to:
DIN connected to:
VCC connected to:
GND connected to:
DOUT not connected in this configuration
pin1 connected to:
pin2 connected to:
D2 connected to:
D3 connected to:
D4 connected to:
D5 connected to:
GND connected to:
// This version uses bit-banged SPI.
// If you see tearing (jagged edges on the circles) try the version
// which uses AVR's hardware SPI peripheral:
// https://wokwi.com/arduino/projects/318868939929027156
#define CLK 12
#define DIN 11
#define CS 10
#define X_SEGMENTS 4
#define Y_SEGMENTS 4
#define NUM_SEGMENTS (X_SEGMENTS * Y_SEGMENTS)
// a framebuffer to hold the state of the entire matrix of LEDs
// laid out in raster order, with (0, 0) at the top-left
byte fb[8 * NUM_SEGMENTS];
void shiftAll(byte send_to_address, byte send_this_data)
{
digitalWrite(CS, LOW);
for (int i = 0; i < NUM_SEGMENTS; i++) {
shiftOut(DIN, CLK, MSBFIRST, send_to_address);
shiftOut(DIN, CLK, MSBFIRST, send_this_data);
}
digitalWrite(CS, HIGH);
}
void setup() {
Serial.begin(115200);
pinMode(CLK, OUTPUT);
pinMode(DIN, OUTPUT);
pinMode(CS, OUTPUT);
// Setup each MAX7219
shiftAll(0x0f, 0x00); //display test register - test mode off
shiftAll(0x0b, 0x07); //scan limit register - display digits 0 thru 7
shiftAll(0x0c, 0x01); //shutdown register - normal operation
shiftAll(0x0a, 0x0f); //intensity register - max brightness
shiftAll(0x09, 0x00); //decode mode register - No decode
}
void loop() {
static int16_t sx1 = 15 << 8, sx2 = sx1, sy1, sy2;
sx1 = sx1 - (sy1 >> 6);
sy1 = sy1 + (sx1 >> 6);
sx2 = sx2 - (sy2 >> 5);
sy2 = sy2 + (sx2 >> 5);
static byte travel = 0;
travel--;
byte *dst = fb;
byte output = 0;
int8_t x_offset = (sx1 >> 8) - X_SEGMENTS * 4;
int8_t y_offset = (sx2 >> 8) - Y_SEGMENTS * 4;
uint8_t screenx, screeny, xroot, yroot;
uint16_t xsumsquares, ysumsquares, xnextsquare, ynextsquare;
int8_t x, y;
// offset the origin in screen space
x = x_offset;
y = y_offset;
ysumsquares = x_offset * x_offset + y * y;
yroot = int(sqrtf(ysumsquares));
ynextsquare = yroot*yroot;
// Quadrant II (top-left)
screeny = Y_SEGMENTS * 8;
while (y < 0 && screeny) {
x = x_offset;
screenx = X_SEGMENTS * 8;
xsumsquares = ysumsquares;
xroot = yroot;
if (x < 0) {
xnextsquare = xroot * xroot;
while (x < 0 && screenx) {
screenx--;
output <<= 1;
output |= ((xroot + travel) & 8) >> 3;
if (!(screenx & 7))
*dst++ = output;
xsumsquares += 2 * x++ + 1;
if (xsumsquares < xnextsquare)
xnextsquare -= 2 * xroot-- - 1;
}
}
// Quadrant I (top right)
if (screenx) {
xnextsquare = (xroot + 1) * (xroot + 1);
while (screenx) {
screenx--;
output <<= 1;
output |= ((xroot + travel) & 8) >> 3;
if (!(screenx & 7))
*dst++ = output;
xsumsquares += 2 * x++ + 1;
if (xsumsquares >= xnextsquare)
xnextsquare += 2 * ++xroot + 1;
}
}
ysumsquares += 2 * y++ + 1;
if (ysumsquares < ynextsquare)
ynextsquare -= 2 * yroot-- - 1;
screeny--;
}
// Quadrant III (bottom left)
ynextsquare = (yroot + 1) * (yroot + 1);
while (screeny) {
x = x_offset;
screenx = X_SEGMENTS * 8;
xsumsquares = ysumsquares;
xroot = yroot;
if (x < 0) {
xnextsquare = xroot * xroot;
while (x < 0 && screenx) {
screenx--;
output <<= 1;
output |= ((xroot + travel) & 8) >> 3;
if (!(screenx & 7))
*dst++ = output;
xsumsquares += 2 * x++ + 1;
if (xsumsquares < xnextsquare)
xnextsquare -= 2 * xroot-- - 1;
}
}
// Quadrant IV (bottom right)