To test out your matrix or build this project without bluetooth control, you can use this basic "snowflakes only" sketch:
// SPDX-FileCopyrightText: 2019 Anne Barela for Adafruit Industries
//
// SPDX-License-Identifier: MIT
/*********************************************************************
Basic snowflake code (without Bluetooth)
Accompanies the Adafruit guide
https://learn.adafruit.com/neopixel-matrix-snowflake-sweater
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
MIT license, check LICENSE for more information
All text above, and the splash screen below must be included in
any redistribution
*********************************************************************/
#include <Adafruit_NeoPixel.h>
#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>
/*=========================================================================
APPLICATION SETTINGS
MATRIX DECLARATION Parameter 1 = width of NeoPixel matrix
Parameter 2 = height of matrix
Parameter 3 = pin number (most are valid)
Parameter 4 = matrix layout flags, add together as needed:
NEO_MATRIX_TOP,
NEO_MATRIX_BOTTOM,
NEO_MATRIX_LEFT,
NEO_MATRIX_RIGHT Position of the FIRST LED in the matrix; pick two, e.g.
NEO_MATRIX_TOP + NEO_MATRIX_LEFT for the top-left corner.
NEO_MATRIX_ROWS, NEO_MATRIX_COLUMNS: LEDs are arranged in horizontal
rows or in vertical columns, respectively; pick one or the other.
NEO_MATRIX_PROGRESSIVE,
NEO_MATRIX_ZIGZAG all rows/columns proceed in the same order,
or alternate lines reverse direction; pick one.
See example below for these values in action.
Parameter 5 = pixel type flags, add together as needed:
NEO_KHZ800 800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
NEO_KHZ400 400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
NEO_GRB Pixels are wired for GRB bitstream (most NeoPixel products)
NEO_RGB Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
-----------------------------------------------------------------------*/
#define FACTORYRESET_ENABLE 1
#define PIN 6 // Which pin on the Arduino is connected to the NeoPixels?
// Example for NeoPixel 8x8 Matrix. In this application we'd like to use it
// with the back text positioned along the bottom edge.
// When held that way, the first pixel is at the top left, and
// lines are arranged in columns, zigzag order. The 8x8 matrix uses
// 800 KHz (v2) pixels that expect GRB color data.
Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(8, 8, PIN,
NEO_MATRIX_TOP + NEO_MATRIX_LEFT +
NEO_MATRIX_COLUMNS + NEO_MATRIX_ZIGZAG,
NEO_GRB + NEO_KHZ800);
/*=========================================================================*/
void setup(void)
{
matrix.begin();
matrix.setBrightness(40);
matrix.fillScreen(0);
matrix.show(); // This sends the updated pixel colors to the hardware.
}
void loop(void)
{
matrix.fillScreen(0);
SnowFlake1(matrix.Color(200, 200, 200));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
matrix.fillScreen(0);
SnowFlake2(matrix.Color(255, 0, 0));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
matrix.fillScreen(0);
SnowFlake3(matrix.Color(0, 255, 0));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
matrix.fillScreen(0);
SnowFlake4(matrix.Color(200, 200, 200));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
matrix.fillScreen(0);
SnowFlake5(matrix.Color(255, 0, 0));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
matrix.fillScreen(0);
SnowFlake6(matrix.Color(0, 255, 0));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
matrix.fillScreen(0);
SnowFlake7(matrix.Color(200, 200, 200));
matrix.show(); // This sends the updated pixel colors to the hardware.
matrix.fillScreen(0);
SnowFlake8(matrix.Color(255, 0, 0));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
}
void SnowFlake1(uint32_t c){
matrix.drawLine(0, 2, 2, 0, c); // x0, y0, x1, y1, color
matrix.drawLine(4, 0, 6, 2, c); // x0, y0, x1, y1, color
matrix.drawLine(0, 4, 2, 6, c); // x0, y0, x1, y1, color
matrix.drawLine(4, 6, 6, 4, c); // x0, y0, x1, y1, color
matrix.drawFastVLine(3, 0, 7, c); // x0, y0, length, color
matrix.drawFastHLine(0, 3, 7, c); // x0, y0, length, color
matrix.drawPixel(3, 3, 0); // x, y, color
}
void SnowFlake2(uint32_t c){
matrix.drawFastVLine(3, 0, 7, c); // x0, y0, length, color
matrix.drawFastHLine(0, 3, 7, c); // x0, y0, length, color
matrix.drawLine(1, 1, 5, 5, c); // x0, y0, x1, y1, color
matrix.drawLine(1, 5, 5, 1, c); // x0, y0, x1, y1, color
matrix.drawPixel(3, 3, 0); // x, y, color
}
void SnowFlake3(uint32_t c){
matrix.drawLine(0, 2, 2, 0, c); // x0, y0, x1, y1, color
matrix.drawLine(0, 4, 4, 0, c); // x0, y0, x1, y1, color
matrix.drawLine(1, 5, 5, 1, c); // x0, y0, x1, y1, color
matrix.drawPixel(3, 3, 0); // x, y, color
matrix.drawRect(2, 2, 3, 3, c); // x0, y0, width, height
matrix.drawLine(2, 6, 6, 2, c); // x0, y0, x1, y1, color
matrix.drawLine(4, 6, 6, 4, c); // x0, y0, x1, y1, color
}
void SnowFlake4(uint32_t c){
matrix.drawRect(2, 2, 3, 3, c); // x0, y0, width, height
matrix.drawLine(0, 3, 3, 0, c); // x0, y0, x1, y1, color
matrix.drawLine(3, 6, 6, 3, c); // x0, y0, x1, y1, color
matrix.drawLine(4, 1, 5, 2, c); // x0, y0, x1, y1, color
matrix.drawLine(1, 4, 2, 5, c); // x0, y0, x1, y1, color
matrix.drawPixel(0, 0, c); // x, y, color
matrix.drawPixel(0, 6, c); // x, y, color
matrix.drawPixel(6, 0, c); // x, y, color
matrix.drawPixel(6, 6, c); // x, y, color
}
void SnowFlake5(uint32_t c){
matrix.fillRect(1, 1, 5, 5, c); // x0, y0, width, height
matrix.drawLine(0, 3, 3, 0, c); // x0, y0, x1, y1, color
matrix.drawLine(3, 6, 6, 3, c); // x0, y0, x1, y1, color
matrix.drawLine(1, 3, 3, 1, 0); // x0, y0, x1, y1, color
matrix.drawLine(3, 5, 5, 3, 0); // x0, y0, x1, y1, color
matrix.drawPixel(2, 4, 0); // x, y, color
matrix.drawPixel(4, 2, 0); // x, y, color
}
void SnowFlake6(uint32_t c){
matrix.fillRect(1, 1, 5, 5, c); // x0, y0, width, height
matrix.drawLine(1, 1, 5, 5, 0); // x0, y0, x1, y1, color
matrix.drawLine(1, 5, 5, 1, 0); // x0, y0, x1, y1, color
matrix.drawPixel(0, 3, c); // x, y, color
matrix.drawPixel(3, 0, c); // x, y, color
matrix.drawPixel(3, 6, c); // x, y, color
matrix.drawPixel(6, 3, c); // x, y, color
}
void SnowFlake7(uint32_t c){
matrix.drawRect(2, 2, 3, 3, c); // x0, y0, width, height
matrix.drawFastVLine(3, 0, 7, c); // x0, y0, length, color
matrix.drawFastHLine(0, 3, 7, c); // x0, y0, length, color
matrix.drawFastVLine(3, 0, 7, c); // x0, y0, length, color
matrix.drawFastHLine(0, 3, 7, c); // x0, y0, length, color
matrix.drawPixel(3, 3, 0); // x, y, color
matrix.drawFastHLine(2, 0, 3, c); // x0, y0, length, color
matrix.drawFastHLine(2, 6, 3, c); // x0, y0, length, color
matrix.drawFastVLine(0, 2, 3, c); // x0, y0, length, color
matrix.drawFastVLine(6, 2, 3, c); // x0, y0, length, color
}
void SnowFlake8(uint32_t c){
//four corners
matrix.drawPixel(0, 0, c); // x, y, color
matrix.drawPixel(0, 6, c); // x, y, color
matrix.drawPixel(6, 0, c); // x, y, color
matrix.drawPixel(6, 6, c); // x, y, color
//upper left corner
matrix.drawLine(0, 2, 2, 0, c); // x0, y0, x1, y1, color
matrix.drawLine(0, 3, 3, 0, c); // x0, y0, x1, y1, color
//center dot
matrix.drawPixel(3, 3, c); // x, y, color
//upper right corner
matrix.drawLine(4, 0, 6, 2, c); // x0, y0, x1, y1, color
matrix.drawLine(3, 0, 6, 3, c); // x0, y0, x1, y1, color
//lower left corner
matrix.drawLine(0, 3, 3, 6, c); // x0, y0, x1, y1, color
matrix.drawLine(0, 4, 2, 6, c); // x0, y0, x1, y1, color
//lower right corner
matrix.drawLine(3, 6, 6, 3, c); // x0, y0, x1, y1, color
matrix.drawLine(4, 6, 6, 4, c); // x0, y0, x1, y1, color
}
void SnowFlake9(uint32_t c){
//four corners
matrix.drawPixel(0, 0, c); // x, y, color
matrix.drawPixel(0, 6, c); // x, y, color
matrix.drawPixel(6, 0, c); // x, y, color
matrix.drawPixel(6, 6, c); // x, y, color
//center dot
matrix.drawPixel(3, 3, c); // x, y, color
//four boxes near center
matrix.drawRect(1, 1, 2, 2, c); // x0, y0, width, height
matrix.drawRect(4, 1, 2, 2, c); // x0, y0, width, height
matrix.drawRect(1, 4, 2, 2, c); // x0, y0, width, height
matrix.drawRect(4, 4, 2, 2, c); // x0, y0, width, height
//clear out corner pixel of boxes
matrix.drawPixel(1, 1, 0); // x, y, color
matrix.drawPixel(5, 1, 0); // x, y, color
matrix.drawPixel(1, 5, 0); // x, y, color
matrix.drawPixel(5, 5, 0); // x, y, color
}
void SnowFlake10(uint32_t c){
//lines across the corners
matrix.drawLine(0, 1, 1, 0, c); // x0, y0, x1, y1, color
matrix.drawLine(5, 0, 6, 1, c); // x0, y0, x1, y1, color
matrix.drawLine(0, 5, 1, 6, c); // x0, y0, x1, y1, color
matrix.drawLine(5, 6, 6, 5, c); // x0, y0, x1, y1, color
//center dot
matrix.drawPixel(3, 3, c); // x, y, color
//four boxes near center
matrix.drawRect(1, 1, 2, 2, c); // x0, y0, width, height
matrix.drawRect(4, 1, 2, 2, c); // x0, y0, width, height
matrix.drawRect(1, 4, 2, 2, c); // x0, y0, width, height
matrix.drawRect(4, 4, 2, 2, c); // x0, y0, width, height
//clear out corner pixel of boxes
matrix.drawPixel(1, 1, 0); // x, y, color
matrix.drawPixel(5, 1, 0); // x, y, color
matrix.drawPixel(1, 5, 0); // x, y, color
matrix.drawPixel(5, 5, 0); // x, y, color
}
void SnowFlake11(uint32_t c){
//corner lines
matrix.drawLine(0, 2, 2, 0, c); // x0, y0, x1, y1, color
matrix.drawLine(4, 0, 6, 2, c); // x0, y0, x1, y1, color
matrix.drawLine(0, 4, 2, 6, c); // x0, y0, x1, y1, color
matrix.drawLine(4, 6, 6, 4, c); // x0, y0, x1, y1, color
//center X
matrix.drawLine(2, 2, 4, 4, c); // x0, y0, x1, y1, color
matrix.drawLine(2, 4, 4, 2, c); // x0, y0, x1, y1, color
}
//8x8
void SnowFlake12(uint32_t c){
matrix.drawLine(1, 1, 6, 6, c); // x0, y0, x1, y1, color
matrix.drawLine(1, 6, 6, 1, c); // x0, y0, x1, y1, color
matrix.fillRect(3, 0, 2, 2, c); // x0, y0, width, height
matrix.fillRect(0, 3, 2, 2, c); // x0, y0, width, height
matrix.fillRect(6, 3, 2, 2, c); // x0, y0, width, height
matrix.fillRect(3, 6, 2, 2, c); // x0, y0, width, height
matrix.show();
}
/*
void showAllSnowflakes(uint32_t c){
SnowFlake1(matrix.Color(red, green, blue));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
matrix.fillScreen(0);
SnowFlake5(matrix.Color(red, green, blue));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
matrix.fillScreen(0);
SnowFlake2(matrix.Color(red, green, blue));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
matrix.fillScreen(0);
SnowFlake8(matrix.Color(red, green, blue));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
matrix.fillScreen(0);
SnowFlake3(matrix.Color(red, green, blue));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
matrix.fillScreen(0);
SnowFlake9(matrix.Color(red, green, blue));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
matrix.fillScreen(0);
SnowFlake4(matrix.Color(red, green, blue));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
matrix.fillScreen(0);
SnowFlake10(matrix.Color(red, green, blue));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
matrix.fillScreen(0);
SnowFlake6(matrix.Color(red, green, blue));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
matrix.fillScreen(0);
SnowFlake11(matrix.Color(red, green, blue));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
matrix.fillScreen(0);
SnowFlake7(matrix.Color(red, green, blue));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
matrix.fillScreen(0);
SnowFlake11(matrix.Color(red, green, blue));
matrix.show(); // This sends the updated pixel colors to the hardware.
delay(500);
}
*/
Page last edited January 21, 2025
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