Same Direction Single-Color LED Chase Sequence

Other Hardware LEDs and Multiplexing
1

I have a 2812B LED strip (RBG) that I need to create in a single-color chase sequence.

It would be similar to a "Knight Rider" type effect except for the fact that it goes only one direction.

With ONE led strip, I want to create an effect SIMILAR to this video

Yes, I know it will only be 1 LED wide, but I am showing you this so you can understand what I am looking for. Unlike the KNIGHT RIDER effect, I don't want it to bounce back.

In order for it to "chase" it would need to have more than 1 pixel/led on at a time, but just "moving" in the same direction.

Typically I use the Neopixel library, but could use other things if necessary.

Thank you in advance for any direction you may give me in my search!!!

2

Let's say you have 4 LEDs.

ledStates[4] = {1, 0, 1, 0};

LED0 = ledStates[i % 4]
LED1 = ledStates[(i + 1) % 4]
LED2 = ledStates[(i + 2) % 4]
LED3 = ledStates[(i + 3) % 4]

start at i = 0
LED0 = 1
LED1 = 0
LED2 = 1
LED3 = 0

...

next iteration when i = 1
LED0 = 0
LED1 = 1
LED2 = 0
LED3 = 1

Give that a try.

3

I want to create the effect of linear motion using a strand of led lights. I believe that is called a chase. But I want multiple lights scrolling or chasing along the strip at the same time so you can choose which light to follow with your eyes as it progresses across

4

Basically you are looping.

I think the code thoughts I wrote up would be a good starting point.

5

ieee488:
Basically you are looping.

I think the code thoughts I wrote up would be a good starting point.

The code you posted was not in code tags. Given the number of posts you have that is a very bad example to set. Also there are no ; in that code.

6

Grumpy_Mike:
The code you posted was not in code tags. Given the number of posts you have that is a very bad example to set. Also there are no ; in that code.

In short, it simply isn't usable. :roll_eyes:

7

I guess, it might be called a theater chase???

8

There are many ways to go about this.
Some pseudo-code:
turn on 1,2,3,4
delay
turn off 1
turn on 5
delay
turn off 2
turn on 6
delay
turn off 3
turn on 7
delay
turn off 4 ...
and so on

It's not compact and refined - but can you "see" what should be done, now? [ Y/N ]

9

Grumpy_Mike:
The code you posted was not in code tags. Given the number of posts you have that is a very bad example to set. Also there are no ; in that code.

It isn't code.

I did write the words code thoughts.

I expect the OP to take my ideas and go from there.

10

Paul__B:
In short, it simply isn't usable. :roll_eyes:

It isn't if you expect to cut and paste it.

And as I wrote before it is code thoughts. I never wrote that it was code. My intention was to give the OP some suggestions, musings, whatever you want to call it.

11

ieee488:
I did write the words code thoughts.

No you didn't.
Anyway the words you should have used was pseudo code.

12

Grumpy_Mike:
No you didn't.
Anyway the words you should have used was pseudo code.

I didn't? ? ? ?

Re-read post #3 above.

And, yes, thank you for the schooling on the use of the words "pseudo code". :roll_eyes:

13

Re-read post #3 above.

Sorry while I read that I did not associate those words with the code you posted previously.