Hello, I want to buy 18 of these led strips ( https://www.aliexpress.com/item/WS2811-led-strip-5m-30-48-60-leds-m-IP30-65-67-10-16-20-pcs/32658513954.html?spm=2114.01010208.3.49.UKtRDK&ws_ab_test=searchweb0_0,searchweb201602_2_10091_10090_9912_10088_1008

I want to buy 18 of these led strips (https://www.aliexpress.com/item/WS2811-led-strip-5m-30-48-60-leds-m-IP30-65-67-10-16-20-pcs/32658513954.html?spm=2114.01010208.3.49.UKtRDK&ws_ab_test=searchweb0_0,searchweb201602_2_10091_10090_9912_10088_10089,searchweb201603_1&btsid=f8882134-fb75-491f-8015-777bcea66b61) Can I control them all with one Ardiono uno running Fastled?

Which version, 30, 48, or 60 pixels per meter?
18 x 5m x 30ppm = 2700 pixels, or
18 x 5m x 60ppm = 5400 pixels

In either case, no, you don’t want to use an Uno. I would suggest a Teensy 3.2 from http://pjrc.com

Probably the 48 ppm one. Is there an arduino that does the job? Because it’s easyer to buy an arduino in The Netherlands.

Keep in mind that these run from 12V, which isn’t really the standard for WS2812’s. Also, these have a single WS2811 for every 3 LED’s. You can’t control each LED individually.

I will keep it in mind thanks

Good point +Andrew Tuline.
So at 48ppm would that be 18 x 5m x 48ppm / 3 = 1440 pixels then? Would still need something like a Teensy 3.2.

One more adruino question :), will the arduino zero work (32-bit 48 MHz)

Just use an Arduino Mega. Can’t go wrong. I have 1500 hooked up using FastLED without problems

Yes, Chris is right, Mega would work. And the Zero has enough memory (the same as Mega) and could work also. Note the Zero outputs 3.2V though, so you might need a level shifter (74HCT245) for the data line. Mega outputs 5V so it should just work without a level shifter needed.

You wouldn’t need a shifter. The signal is repeated at 5V after the first LED and 3.2V is e enough to trigger WS2812s.