How to increase brightness in code

Using Arduino LEDs and Multiplexing
1

Hi guys I need your help please. How can I increase the brightness of this effect:

 /**
 * Arduino Uno - NeoPixel Fire
 * v. 1.0
 * Copyright (C) 2015 Robert Ulbricht
 * https://www.arduinoslovakia.eu
 *
 * IDE: 1.8.5 or higher
 * Board: Arduino or Arduino Pro Mini
 *
 * Libraries
 * NeoPixel: https://github.com/adafruit/Adafruit_NeoPixel
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <Adafruit_NeoPixel.h>

// data pin
#define PIN 6
// led count
#define CNT 24

// Parameter 1 = number of pixels in strip
// Parameter 2 = pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
//   NEO_RGB     Pixels are wired for RGB bitstream
//   NEO_GRB     Pixels are wired for GRB bitstream
//   NEO_KHZ400  400 KHz bitstream (e.g. FLORA pixels)
//   NEO_KHZ800  800 KHz bitstream (e.g. High Density LED strip)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(CNT, PIN, NEO_GRB + NEO_KHZ800);

uint32_t fire_color   = strip.Color ( 80,  35,  00);
uint32_t off_color    = strip.Color (  0,  0,  0);

///
/// Fire simulator
///
class NeoFire
{
  Adafruit_NeoPixel &strip;
 public:

  NeoFire(Adafruit_NeoPixel&);
  void Draw();
  void Clear();
  void AddColor(uint8_t position, uint32_t color);
  void SubstractColor(uint8_t position, uint32_t color);
  uint32_t Blend(uint32_t color1, uint32_t color2);
  uint32_t Substract(uint32_t color1, uint32_t color2);
};

///
/// Constructor
///
NeoFire::NeoFire(Adafruit_NeoPixel& n_strip)
: strip (n_strip)
{
}

///
/// Set all colors
///
void NeoFire::Draw()
{
Clear();

for(int i=0;i<CNT;i++)
  {
  AddColor(i, fire_color);
  int r = random(80);
  uint32_t diff_color = strip.Color ( r, r/2, r/2);
  SubstractColor(i, diff_color);
  }
  
strip.show();
}

///
/// Set color of LED
///
void NeoFire::AddColor(uint8_t position, uint32_t color)
{
uint32_t blended_color = Blend(strip.getPixelColor(position), color);
strip.setPixelColor(position, blended_color);
}

///
/// Set color of LED
///
void NeoFire::SubstractColor(uint8_t position, uint32_t color)
{
uint32_t blended_color = Substract(strip.getPixelColor(position), color);
strip.setPixelColor(position, blended_color);
}

///
/// Color blending
///
uint32_t NeoFire::Blend(uint32_t color1, uint32_t color2)
{
uint8_t r1,g1,b1;
uint8_t r2,g2,b2;
uint8_t r3,g3,b3;

r1 = (uint8_t)(color1 >> 16),
g1 = (uint8_t)(color1 >>  8),
b1 = (uint8_t)(color1 >>  0);

r2 = (uint8_t)(color2 >> 16),
g2 = (uint8_t)(color2 >>  8),
b2 = (uint8_t)(color2 >>  0);

return strip.Color(constrain(r1+r2, 0, 255), constrain(g1+g2, 0, 255), constrain(b1+b2, 0, 255));
}

///
/// Color blending
///
uint32_t NeoFire::Substract(uint32_t color1, uint32_t color2)
{
uint8_t r1,g1,b1;
uint8_t r2,g2,b2;
uint8_t r3,g3,b3;
int16_t r,g,b;

r1 = (uint8_t)(color1 >> 16),
g1 = (uint8_t)(color1 >>  8),
b1 = (uint8_t)(color1 >>  0);

r2 = (uint8_t)(color2 >> 16),
g2 = (uint8_t)(color2 >>  8),
b2 = (uint8_t)(color2 >>  0);

r=(int16_t)r1-(int16_t)r2;
g=(int16_t)g1-(int16_t)g2;
b=(int16_t)b1-(int16_t)b2;
if(r<0) r=0;
if(g<0) g=0;
if(b<0) b=0;

return strip.Color(r, g, b);
}

///
/// Every LED to black
///
void NeoFire::Clear()
{
for(uint16_t i=0; i<strip.numPixels (); i++)
  strip.setPixelColor(i, off_color);
}

NeoFire fire(strip);

///
/// Setup
///
void setup()
{
strip.begin();
strip.show(); // Initialize all pixels to 'off'
}

///
/// Main loop
///
void loop()
{
fire.Draw();
delay(random(50,150));
}

Looking forward for your help.

2

As I am sure you know, the brightness of a NeoPixel is set by the R, G and B values written to it. Your Draw() function sets the R, G and B values, so to make the NeoPixels brighter these need to be larger, What sort of values does your manipulation of the values result in ? Have you tried printing them ? Can you increase them ?

3

Did you try getBrightness() and or setBrightness() functions of the Adafruit library?

neopixfuncs

4

Which part in the code can i increase the values of R, G and B?

5

Yes I did try to define brightness and add setBrightness() in the setup function. But didn't work

6

I found it. Please see code for reference

/**
 * Arduino Uno - NeoPixel Fire
 * v. 1.0
 * Copyright (C) 2015 Robert Ulbricht
 * https://www.arduinoslovakia.eu
 *
 * IDE: 1.8.5 or higher
 * Board: Arduino or Arduino Pro Mini
 *
 * Libraries
 * NeoPixel: https://github.com/adafruit/Adafruit_NeoPixel
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <Adafruit_NeoPixel.h>

// data pin
#define PIN 6
// led count
#define CNT 15
#define BRIGHTNESS 200

// Parameter 1 = number of pixels in strip
// Parameter 2 = pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
//   NEO_RGB     Pixels are wired for RGB bitstream
//   NEO_GRB     Pixels are wired for GRB bitstream
//   NEO_KHZ400  400 KHz bitstream (e.g. FLORA pixels)
//   NEO_KHZ800  800 KHz bitstream (e.g. High Density LED strip)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(CNT, PIN, NEO_GRB + NEO_KHZ800);

uint32_t fire_color   = strip.Color ( 80,  35,  00);
uint32_t off_color    = strip.Color (  0,  0,  0);

///
/// Fire simulator
///
class NeoFire
{
  Adafruit_NeoPixel &strip;
 public:

  NeoFire(Adafruit_NeoPixel&);
  void Draw();
  void Clear();
  void AddColor(uint8_t position, uint32_t color);
  void SubstractColor(uint8_t position, uint32_t color);
  uint32_t Blend(uint32_t color1, uint32_t color2);
  uint32_t Substract(uint32_t color1, uint32_t color2);
};

///
/// Constructor
///
NeoFire::NeoFire(Adafruit_NeoPixel& n_strip)
: strip (n_strip)
{
}

///
/// Set all colors
///
void NeoFire::Draw()
{
Clear();
strip.setBrightness(200);

for(int i=0;i<CNT;i++)
  {
  AddColor(i, fire_color);
  int r = random(80);
  uint32_t diff_color = strip.Color ( r, r/2, r/2);
  SubstractColor(i, diff_color);
  }
  
strip.show();
}

///
/// Set color of LED
///
void NeoFire::AddColor(uint8_t position, uint32_t color)
{
uint32_t blended_color = Blend(strip.getPixelColor(position), color);
strip.setPixelColor(position, blended_color);
}

///
/// Set color of LED
///
void NeoFire::SubstractColor(uint8_t position, uint32_t color)
{
uint32_t blended_color = Substract(strip.getPixelColor(position), color);
strip.setPixelColor(position, blended_color);
}

///
/// Color blending
///
uint32_t NeoFire::Blend(uint32_t color1, uint32_t color2)
{
uint8_t r1,g1,b1;
uint8_t r2,g2,b2;
uint8_t r3,g3,b3;

r1 = (uint8_t)(color1 >> 16),
g1 = (uint8_t)(color1 >>  8),
b1 = (uint8_t)(color1 >>  0);

r2 = (uint8_t)(color2 >> 16),
g2 = (uint8_t)(color2 >>  8),
b2 = (uint8_t)(color2 >>  0);

return strip.Color(constrain(r1+r2, 0, 255), constrain(g1+g2, 0, 255), constrain(b1+b2, 0, 255));
}

///
/// Color blending
///
uint32_t NeoFire::Substract(uint32_t color1, uint32_t color2)
{
uint8_t r1,g1,b1;
uint8_t r2,g2,b2;
uint8_t r3,g3,b3;
int16_t r,g,b;

r1 = (uint8_t)(color1 >> 16),
g1 = (uint8_t)(color1 >>  8),
b1 = (uint8_t)(color1 >>  0);

r2 = (uint8_t)(color2 >> 16),
g2 = (uint8_t)(color2 >>  8),
b2 = (uint8_t)(color2 >>  0);

r=(int16_t)r1-(int16_t)r2;
g=(int16_t)g1-(int16_t)g2;
b=(int16_t)b1-(int16_t)b2;
if(r<0) r=0;
if(g<0) g=0;
if(b<0) b=0;

return strip.Color(r, g, b);
}

///
/// Every LED to black
///
void NeoFire::Clear()
{
for(uint16_t i=0; i<strip.numPixels (); i++)
  strip.setPixelColor(i, off_color);
}

NeoFire fire(strip);

///
/// Setup
///
void setup()
{
strip.begin();
strip.show(); // Initialize all pixels to 'off'
}

///
/// Main loop
///
void loop()
{
fire.Draw();
delay(random(50,150));
}

Thank you guys. Much appreciated

7

So you only had to find the right place for the setBrightness() call, correct?

So the post you tagged as solution, was not the solution,
this will mislead people reading this thread later into believing it were.

8

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