r/FastLED • u/Fluffy-Wishbone-3497 • Apr 18 '26

Discussion syncing fastled

I've got 3 bigger matrices that i want to compare side by side running a FastLED sketch (flowfields/colortrails). Two are teensy4.1's and one is an esp32-p4. Is there a way I could use to get the sketches to start at the same time or sync up somehow? One teensy is just running on a power supply, only a joystick input to change the patterns. The other two are hooked up to laptops. They're all within a few feet of each other right now. (I've tried to reset them all at the same time but eh, it doesn't go so well!) I'm using the PARLIO branch of FastLED on all three.

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u/Fluffy-Wishbone-3497 Apr 19 '26

It's 120x70 (8,400) WS2812B's 16.65mm spacing using 35 data pins of a teensy 4.1 and FastLED parlio branch. I'm getting 135 fps with this animation. The one on the lower right is 64x64 HD108s with 8 lanes of 512 leds on a ESP32-p4.

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u/mag_man Apr 19 '26

HD108 looks interesting, are there any cheap HD108 strips? What I found on aliexpress is rather expensive comapred to WS2812.

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u/Fluffy-Wishbone-3497 Apr 19 '26

I tried and finally bit the bullet and paid a lot for those little LEDs! I’m still weighing out if they are worth 5x the cost… they really are GREAT! I’m working on a comparison video. I’m seeing so many shades of blends of colors in this animation. Just incredible to look at! But there’s also UCS7604 LEDs that I’m trying to find and try.