Using analog RGB individually addresable LED strip without a moffset

Using Arduino General Electronics
1

Can this be done using analog or pwm ports on a cheapduino?

It's an analog individually addreseble led rgb strip of 60 led's.

Thanks!
-Sam

2

Short answer, no. You need a MOSFET or a relay. You cannot dim with a relay.

3

  1. No part number or datasheet - no information to go on at all.

  2. Individually addressable LEDs are not analog, and MOSFET is not needed to drive a serial signal
    used in individually addressable LEDs.

So please produce accurate information about the actual LED strip you have.

4

Are these Neopixel strips?

(or DotStars?)

5

Mm, you guys are right. A link to the ledstrip would help (or a better explanation).

When I read analog RGB strip I just thought of a logic-less 5050 ledstrip. But then "individually addressable" doesn't make sens. And for a Neopixel the word analog doesn't make sens...

6

Iv used arduino in the past, but don't know a ton about leds... (Obviosuly)
Here is the datasheet https://www.adafruit.com/datasheets/WS2812B.pdf

Thanks!
-Sam

7

Find the Neopixel library at adafruit.com

WS2812B is combined 3 LEDs and 8-bit PWM output per LED chip. You shift in 24 bits, pause, and it updates its outputs.
If you shift in more bits, its passes them along, and when shifting stops each devices uses the last 24 bits it received.

8

Got it working with the strand test, Thanks!!!

CrossRoads:
Find the Neopixel library at adafruit.com

WS2812B is combined 3 LEDs and 8-bit PWM output per LED chip. You shift in 24 bits, pause, and it updates its outputs.
If you shift in more bits, its passes them along, and when shifting stops each devices uses the last 24 bits it received.

9

Btw, 60 leds needs a separate power supply. The USB power from a PC is not enough and the 5V out of the Arduino when powering the Arduino from anything else then 5V is not going to last.

10

Neopixel/DotStars = no mosfet needed.