Anti-interference problem of ws2812b light strip

sgz10010010

Anti-interference problem of ws2812b light strip [Copy link]

 

Probably because there is a long connecting wire in the middle, only the first section of the light strip is on. I want to use a pair of max485 for conversion in the middle. Can it achieve the anti-interference effect?

dcexpert

WS2812 is single-line control, not RS485, and has strict timing requirements. If you use max485 for signal conversion, it may be possible. The maximum rate of max485 is 2.5M, which is greater than WS2812.

dcexpert

Or you can consider using RF to extend the distance, as wireless is more flexible.

chunyang

Let’s first talk about how your light strips are interconnected and what the specific circuit is.

sgz10010010

dcexpert published on 2020-8-2 11:00 Or you can consider using RF to extend the distance, the wireless method is more flexible.

Is nrf24l01 okay?

huo_hu

Use an oscilloscope to see what the reason is

qwqwqw2088

How long is the longer line in the middle?

What is the effect of interference and how to solve it

dcexpert

sgz10010010 posted on 2020-8-2 21:13 Is nrf24l01 okay?

nrf20L01 or other wireless chips can be used to send control instructions to the wireless through the microcontroller, but the timing signal of WS2812 cannot be directly transmitted.

sgz10010010

qwqwqw2088 posted on 2020-8-3 08:46 There is a long line in the middle. How long is the interference situation and what is the effect? Let's talk about the solution

It should be more than 3 meters. The first section is normal and the latter flashes randomly.

huo_hu

sgz10010010 posted on 2020-8-3 15:11 It should be more than 3 meters. The first section is normally bright, and the latter flashes randomly

I have also been using this light recently, and it occasionally flickers abnormally, but I don't think it is interference, but a timing problem. I am still working on it. I don't know if this is what you are talking about.

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qwqwqw2088

The random flashing at the back is a timing control problem. The ws2812b protocol has frequency requirements.

Interference phenomenon should be mostly in the case of slight brightness

huo_hu

qwqwqw2088 posted on 2020-8-4 07:38 The random flashing at the back is a control timing problem. The ws2812b protocol has frequency requirements. The interference phenomenon should be mostly in the case of faint brightness

Yes, I changed the interrupt priority.

宋元浩

At a distance of 3 meters, will the signal attenuation be serious?

赤豆糊siki

qwqwqw2088 posted on 2020-8-4 07:38 The random flashing at the back is a control timing problem. The ws2812b protocol has frequency requirements. The interference phenomenon should be mostly in the case of faint brightness

Hello, I have a similar problem, but the situation is serious and it flickers a lot when there is a small amount. I use a single-chip microcomputer with an M0+ core. There is no DMA, just fill the array and then send it out to achieve breathing, but the effect is not ideal, it is stumbling and not smooth at all... What do you mean by the frequency requirement of the protocol? Where should I pay attention in the program?

qwqwqw2088

Red bean paste siki published on 2021-6-28 11:34 Hello, I also have a similar problem, but the situation is serious and it will flicker when there are trace amounts. I use a microcontroller with an M0+ core. There is no DMA, ...

It seems to be different from what I said before.

It is related to the length of the light strip. Too long a line may cause interference.

赤豆糊siki

qwqwqw2088 posted on 2021-6-28 13:20 It seems that the situation is different from what I said before. It has something to do with the length of the light strip. Too long a line can cause interference

OK, thanks!

trx007

Red bean paste siki published on 2021-6-28 11:34 Hello, I also have a similar problem, but the situation is serious and it will flicker when there are trace amounts. I use a microcontroller with an M0+ core. There is no DMA, ...

If there is no DMA, you can try SPI

trx007

huo_hu posted on 2020-8-4 17:17 Yes, I changed the interrupt priority later.

Hey, the color of my first light is not normal, but the colors of the following lights are normal. What could be the problem?

trx007

trx007 posted on 2022-2-14 20:49 Brother, the color of my first light is abnormal, but the colors of the lights behind are normal. What could be the problem?

I use PWM+DMA to drive

huo_hu

trx007 posted on 2022-2-14 20:49 Brother, the color of my first light is abnormal, but the colors of the following lights are normal. What could be the problem?

Sorry, just saw this

The first light is abnormal. It may be that the timing after sending data is incorrect. You can see it by trying to change the number of points of the light. After sending data, it will start to display after a period of time. There is a minimum value but no maximum value during this period.