Hello everyone ,I am new here ,

ankit_kapoor · December 26, 2017, 7:25pm

Hello everyone ,I am new here , I am in between of my project ,and got stucked , i am making a neo pixel led LED program of 2811 using Arduino .What i want is there are 200 neo pixel led been connected to an arduino and these LED should working in sequence and move forward ,as led us take an example like the first led is red now the next 5 led will be in off state and then the 6th led will be red again the next 5 five led will be off then the 12th led will be red then again the next 5 led will be off and 18th led will be red and so on , now the led will be moving in fashion that the preceding led will turn off and the succeeding led will turn on and again the same moving so on .

marmil · December 26, 2017, 8:03pm

Hello Ankit. Here are two sketches which might give you some ideas of ways to do what you what.

github.com

marmilicious/FastLED_examples/blob/master/three_moving_pixels_v3.ino

//***************************************************************
// Three moving pixels example
//     Uses modulo, %, to make pixel position "loop" around and
//     stay in valid pixel range.
//
// Marc Miller, Feb 2015.  Updated Jan 2016.
//***************************************************************


#include "FastLED.h"
#define LED_TYPE NEOPIXEL  // Strip type: NEOPIXEL, APA102, LPD8806, etc.
#define DATA_PIN 6
//#define CLOCK_PIN 13
#define NUM_LEDS 12
//#define COLOR_ORDER BGR
#define MASTER_BRIGHTNESS 100  // Master brightness (Range is 0-255)
CRGB leds[NUM_LEDS];

int16_t positionRed = 0;    // Set initial start position of Red pixel
int16_t positionWhite = 4;  // Set initial start position of White pixel

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github.com

marmilicious/FastLED_examples/blob/master/repeating_pattern.ino

//***************************************************************
// If we want a pattern to repeat every 5 pixels then the
// first pixel set to light up would be: 0,5,10,15,20...
// This can be represented by:  leds[5 * (x - 1) + 5]
//
// Let's put this into a loop with some variables!
//
//
// Marc Miller, Nov 2015
//              May 2020 - replaced all delays with EVERY_N
//***************************************************************

#include "FastLED.h"
#define LED_TYPE LPD8806
#define DATA_PIN 11
#define CLOCK_PIN 13
#define NUM_LEDS 32
#define COLOR_ORDER GRB
#define MASTER_BRIGHTNESS 100
CRGB leds[NUM_LEDS];

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And look at the FirstLight example in the FastLED examples too if you haven’t seen it.

github.com

FastLED/FastLED/blob/master/examples/FirstLight/FirstLight.ino

// Use if you want to force the software SPI subsystem to be used for some reason (generally, you don't)
// #define FASTLED_FORCE_SOFTWARE_SPI
// Use if you want to force non-accelerated pin access (hint: you really don't, it breaks lots of things)
// #define FASTLED_FORCE_SOFTWARE_SPI
// #define FASTLED_FORCE_SOFTWARE_PINS
#include <FastLED.h>

///////////////////////////////////////////////////////////////////////////////////////////
//
// Move a white dot along the strip of leds.  This program simply shows how to configure the leds,
// and then how to turn a single pixel white and then off, moving down the line of pixels.
// 

// How many leds are in the strip?
#define NUM_LEDS 60

// For led chips like WS2812, which have a data line, ground, and power, you just
// need to define DATA_PIN.  For led chipsets that are SPI based (four wires - data, clock,
// ground, and power), like the LPD8806 define both DATA_PIN and CLOCK_PIN
// Clock pin only needed for SPI based chipsets when not using hardware SPI

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ankit_kapoor · December 27, 2017, 5:30am

@marmil in the last link, how will I program multiple groups led in swapping way. Like you can see in the video that the bunch of consecutive LED is moving in a forward way. The similar way. in the last link program, a group is swapping but I want multiple groups at the same time.

marmil · December 27, 2017, 8:00am

You’re probably going to have to combine and edit several bits of code to do exactly what you’re looking for. Keep experimenting and study as many examples as you can.

ankit_kapoor · December 27, 2017, 2:20pm

@marmil where i can fine these examples can you please tell me
so that i can go on to a right direction

Mike_Dodds · January 23, 2018, 1:22am

Check out the CRGBArray abstractions. Also the modulo operator will probably sort all of this out. “%”.