Help with coding Arduino for Adafruit Neopixels

The library has commands to individually set pixel color as needed which you seem to already be aware of

so for example

setPixelColor( uint16_t n, uint8_t r, uint8_t g, uint8_t b)  will let you specify the pixel ID (n), then the red, green and blue color from 0 - 255 for each.

initialization of course will need you to simply specify there are 4 pixels to be used

if you have a few variables containing the current mills() + the duration to state changes then you can look at these in a loop to decide what to do

the NEOPIXEL library examples have many functions that perform different effects and will work with any given pixel length

hope this helps

Peter

Yes, I have been using the Neopixel library and examples, especially those in strand test extensively.

I have not been able to find what I am trying to achieve in this project.

First question I have is can you use setBrightness on a single pixel or is that only able to be used on the whole strip?

Second of all I have been trying to figure out how to write a decrementing function to use the setBrightness command to fade out the entire strip then return to my void loop

Third is it possible to use the setPixelColor on more than one pixel in one line or do I need to assign every pixel individually? Can I use one line of code to set pixels 0 and 2 to the same?

I had been using the example code colorWipe for that purpose and just putting the time at 1 but if I can set them another way it would be very helpful especially if using 4 pixels in one like I can address 0 and 2 and the next 1 and 3.

I have had very limited experience writing code, and most of it has been adapting example codes to do what I want them to do, or close to it.

Now I am trying to make this project mine, and having a difficult time with it.

Here is what I want to be able to do:

In my void loop I would like to be able to:

setPixelColor of a pixel

then call up a subroutine //function, void, whatever you call it//  "fade() "

have that routine fade the led or the entire strip completely out before resetting the whole strip back to (0, 0, 0) RGB and set the brightness back to 255

then return to the void loop for the next command.

In total the void loop will probably be doing the bring up a pixel at different colors and intensities and possibly more than 1 pixel at a time.

Example of what I would like

strip.setPixelColor(0, 100, 255, 50);

strip.setPixelColor(1, 255, 0, 100);

strip.setPixelColor(2, 100, 255, 50);

strip.setPixelColor(3, 255, 0, 100);

strip.show();

fade();   //or fade(T); or fade(T, P); Where T is the time of the fade and if possible P is the pixel as long as I can still set up to make it fade all pixels as well

strip.setPixelColor(2, 255, 0, 0);

strip.show();

delay(100);

strip.setPixelColor(1, 0, 255, 0);

strip.show();

delay(75);

fade();

// and so on

There will also be other things is will be doing such as strobes, chases and other random action with the LEDs

The whole purpose of this project is for my wife to put inside a candle holder she has that she wants a light in that can look like the light from a fireworks show.

This will hopefully be going on an Adafruit Trinket and will be packaged to fit in something about the size of a tea light with a cue of the 4 pixels sticking out of the top.

Yes, I have been using the Neopixel library and examples, especially those in strand test extensively.

I have not been able to find what I am trying to achieve in this project.

First question I have is can you use setBrightness on a single pixel or is that only able to be used on the whole strip?

Second of all I have been trying to figure out how to write a decrementing function to use the setBrightness command to fade out the entire strip then return to my void loop

Third is it possible to use the setPixelColor on more than one pixel in one line or do I need to assign every pixel individually? Can I use one line of code to set pixels 0 and 2 to the same?

I had been using the example code colorWipe for that purpose and just putting the time at 1 but if I can set them another way it would be very helpful especially if using 4 pixels in one like I can address 0 and 2 and the next 1 and 3.

I have had very limited experience writing code, and most of it has been adapting example codes to do what I want them to do, or close to it.

Now I am trying to make this project mine, and having a difficult time with it.

Here is what I want to be able to do:

In my void loop I would like to be able to:

setPixelColor of a pixel

then call up a subroutine //function, void, whatever you call it//  "fade() "

have that routine fade the led or the entire strip completely out before resetting the whole strip back to (0, 0, 0) RGB and set the brightness back to 255

then return to the void loop for the next command.

In total the void loop will probably be doing the bring up a pixel at different colors and intensities and possibly more than 1 pixel at a time.

Example of what I would like

strip.setPixelColor(0, 100, 255, 50);

strip.setPixelColor(1, 255, 0, 100);

strip.setPixelColor(2, 100, 255, 50);

strip.setPixelColor(3, 255, 0, 100);

strip.show();

fade();   //or fade(T); or fade(T, P); Where T is the time of the fade and if possible P is the pixel as long as I can still set up to make it fade all pixels as well

strip.setPixelColor(2, 255, 0, 0);

strip.show();

delay(100);

strip.setPixelColor(1, 0, 255, 0);

strip.show();

delay(75);

fade();

// and so on

There will also be other things is will be doing such as strobes, chases and other random action with the LEDs

The whole purpose of this project is for my wife to put inside a candle holder she has that she wants a light in that can look like the light from a fireworks show.

This will hopefully be going on an Adafruit Trinket and will be packaged to fit in something about the size of a tea light with a cue of the 4 pixels sticking out of the top.