I want a lighting fixture with ID information for my research. Inside the WS2812's 16 by 16 light board, first it lights up all the time, then embeds an ID that is invisible to the human eye. My idea is to make this ID number flicker at a frequency above 50hz while the display dips in half. So it …

Only answering the question in the topic title. One bit takes 1.25 microseconds. Multiply by 24 (3 bytes for r/g/b for one pixel) so that gives 30 microseconds. Multiply that by the number of LEDs (256) and you get the time needed for a single refresh of all 256 LEDs.

thanks for you . yes,it takes about 7.68ms to refresh a complete matrix of 256 leds. And,theoretical maximum refresh rate: about 1000/7.68≈130hz The refresh rate is enough for the invisible .

Be aware that interrupts are disabled while the data is being sent to the LEDs.

Plus the 50us pause to latch them: [image] NeoPixel (using Adafruit_NeoPixel) Affects Stepper Motor (using AccelStepper) From the Neopixel side, an update of 10 pixels should take 20*30us+50us = 300us which should leave plenty of time for a step. (Adafruit reference)

[image] zyh_learning: 7.68ms call it 8 ms. Would seem to indicate you could actually refresh at > 120 Hz, with a well - designed code. To convince yourself that this is so, simply write a loop() that changes the colour of one pixel, then calls the update mechanism. When you've figured out …

thanks point out my mistake，I have changed. :grinning:

:heart:I tried 4 lamp beads and found that they were achievable. So now the problem is 256 beads of data transmission data too much, resulting in low refresh rate.[quote="zyh_learning, post:1, topic:1317075, full:true"] I want a lighting fixture with ID information for my research. Inside the WS2…

[image] zyh_learning: And,theoretical maximum refresh rate: about 1000/7.68≈130hz The refresh rate is enough for the invisible . Be aware that in your code you refresh the matrix twice , so the maximum rate about 70hz

[image] b707: Be aware that in your code you refresh the matrix twice , so the maximum rate about 70hz But it can't arrive the 50hz,because i can see the led is refresh.

[image] zyh_learning: because i can see the led is refresh. How did you seen it? By the camera?

Arduino+ws2812 What is the maximum refresh rate？I wanted to make a number that wouldn't refresh visible to the human eye, but it didn't. LED panels 16

Other Hardware LEDs and Multiplexing

DaveX October 31, 2024, 12:07pm 5

Plus the 50us pause to latch them:

Topic		Replies	Views
66x22 WS2812B matrix blackout LEDs and Multiplexing	12	258	August 3, 2025
Strong flickering with multiplexed 10 x 10 LED matrix LEDs and Multiplexing	24	516	August 23, 2025
Arduino uno r4 built-in led matrix blinking with neopixels LEDs and Multiplexing	4	190	May 30, 2025
Need help with WS2812B Matrix Displays	21	678	September 14, 2024
Understanding LED matrix refresh rates LEDs and Multiplexing	20	2766	July 6, 2023

Arduino+ws2812 What is the maximum refresh rate？I wanted to make a number that wouldn't refresh visible to the human eye, but it didn't. LED panels 16

Related topics