MajorSnags
Published © GPL3+

M5StickC Flame Demo

Oldschool fire demo

IntermediateWork in progress242
M5StickC Flame Demo

Things used in this project

Hardware components

M5StickC ESP32-PICO Mini IoT Development Board
M5Stack M5StickC ESP32-PICO Mini IoT Development Board
×1

Software apps and online services

Arduino IDE
Arduino IDE

Story

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Code

M5StickC_Flame

Arduino
M5StickC Arduino IDE code
// Simple M5StickC oldschool flame effect
// All credit to Lode Vandevenne https://lodev.org/ whose code I have adapted for the M5StickC


#include <M5StickC.h>

const int screenWidth = 80;
const int screenHeight = 160;
int colour[128]; // Array to hold the colour palette
int fire[screenHeight][screenWidth]; //Array to hold the screen buffer

void setup() {
  // put your setup code here, to run once:
  M5.begin();

  // This for loop creates a black -> red then red -> yellow colour palette
  for (int i = 0; i < 128; i++) {
    if (i < 64) {
      colour[i] = (int(i/2) * 0x800);
    }
    else {
      colour[i] = 0xf800 + ((i - 64) * 0x20);
    }
  }
  
  // Clear the screen buffer
  
  for (int y = 0; y < screenHeight; y++) {
    for (int x = 0; x < screenWidth; x++) {
        fire[y][x] = 0;
    }
  }
}

void loop() {
  // put your main code here, to run repeatedly:

  // Randomise the bottom line of the screen buffer
  
  for (int x = 0; x < screenWidth; x++) {
    fire[screenHeight - 1][x] = (64 + random(64));
  }

  // Calculate the flame algorithm from the top down
  
  for (int y =0; y < (screenHeight - 1); y++) {
    for (int x = 0; x < screenWidth; x++) {
      fire[y][x] =
      ((fire[(y + 1) % screenHeight][(x - 1) % screenWidth]
      + fire[(y + 1) % screenHeight][(x) % screenWidth]
      + fire[(y + 1) % screenHeight][(x + 1) % screenWidth]
      + fire[(y + 2) % screenHeight][(x) % screenWidth])
      * 64) / 257; // play with these values for different effects, second number must be just over 4 x the first
    }
  }
  
  // Update the screen
  
  for (int y =0; y < screenHeight; y++) {
    for (int x = 0; x < screenWidth; x++) {
      M5.Lcd.drawPixel(x, y, colour[(fire[y][x])]);
    }
  }
}

M5Stack Flame Demo

Arduino
Changes to the M5StickC code to run on the M5Stack
// Simple M5Stack oldschool flame effect
// All credit to Lode Vandevenne https://lodev.org/ whose code I have adapted for the M5Stack


#include <M5Stack.h>
// Only using every other pixel due to speed and memory use
const int screenWidth = 160;
const int screenHeight = 120;
int colour[96]; // Array to hold the colour palette
int fire[screenHeight][screenWidth]; //Array to hold the screen buffer

void setup() {
  // put your setup code here, to run once:
  M5.begin();

  // This for loop creates a black -> red then red -> yellow colour palette
  for (int i = 0; i < 96; i++) {
    if (i < 32) {
      colour[i] = (i * 0x800);
    }
    else {
      colour[i] = 0xf800 + ((i - 32) * 0x20);
    }
  }
  
  // Clear the screen buffer
  
  for (int y = 0; y < screenHeight; y++) {
    for (int x = 0; x < screenWidth; x++) {
        fire[y][x] = 0;
    }
  }
}

void loop() {
  // put your main code here, to run repeatedly:

  // Randomise the bottom line of the screen buffer
  
  for (int x = 0; x < screenWidth; x++) {
    fire[screenHeight - 1][x] = (32 + random(64));
  }

  // Calculate the flame algorithm from the top down
  
  for (int y =0; y < (screenHeight - 1); y++) {
    for (int x = 0; x < screenWidth; x++) {
      fire[y][x] =
      ((fire[(y + 1) % screenHeight][(x - 1) % screenWidth]
      + fire[(y + 1) % screenHeight][(x) % screenWidth]
      + fire[(y + 1) % screenHeight][(x + 1) % screenWidth]
      + fire[(y + 2) % screenHeight][(x) % screenWidth])
      * 64) / 257 ; // play with these values for different effects, second number must be just over 4 x the first
    }
  }
  
  // Update the screen
  
  for (int y =0; y < screenHeight; y++) {
    for (int x = 0; x < screenWidth; x++) {
      M5.Lcd.drawPixel(2*x, 2*y, colour[(fire[y][x])]);
    }
  }
}

Credits

MajorSnags

MajorSnags

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