Can't get my neopixel to work :(

I’ve read many of the troubleshooting items but haven’t found anyone describing what’s happening to me.

I bought this WS2811 strip from amazon:

I have it wired to an Arduino Uno. I’m using a 330 ohm resistor between the data pin and strip in. I’m positive I’ve wired at the start of the strip vs the end.

I’ve tried both the AdaFruit striptest sketch, as well as the below simpler sketch.

In all cases, all the LEDs on the strand just have a tiny little orange dot on - nothing changes regardless of sketch. So…the strand is getting power.

It’s almost like everything is ready and wired well, but no data signals are being processed (or sent). I tried changing pins, but that didn’t do anything. I’m not exactly sure how else to troubleshoot.

I also tried KHZ800 and different color orderings; no effect.

Could really use ideas.

// Simple NeoPixel test. Lights just a few pixels at a time so a
// 1m strip can safely be powered from Arduino 5V pin. Arduino
// may nonetheless hiccup when LEDs are first connected and not
// accept code. So upload code first, unplug USB, connect pixels
// to GND FIRST, then +5V and digital pin 6, then re-plug USB.
// A working strip will show a few pixels moving down the line,
// cycling between red, green and blue. If you get no response,
// might be connected to wrong end of strip (the end wires, if
// any, are no indication – look instead for the data direction
// arrows printed on the strip).

#include <Adafruit_NeoPixel.h>

#define PIN 6
#define N_LEDS 150

Adafruit_NeoPixel strip = Adafruit_NeoPixel(N_LEDS, PIN, NEO_BRG + NEO_KHZ400);

void setup() {

void loop() {
chase(strip.Color(255, 0, 0)); // Red
chase(strip.Color(0, 255, 0)); // Green
chase(strip.Color(0, 0, 255)); // Blue

static void chase(uint32_t c) {
for(uint16_t i=0; i<strip.numPixels()+4; i++) {
strip.setPixelColor(i , c); // Draw new pixel
strip.setPixelColor(i-4, 0); // Erase pixel a few steps back;
} BTF-LIGHTING WS2811 IC=RGB IC Addressable Dream Color LED Strip 16.4FT 30LEDs/m 10Pixels/m 150LEDs 50pixels IP65 Splash Proof Black PCB Flexible DC12V Chasing Effect for Bedroom,Desk,Home Decoration: Home Improvement

That's a 12V version, do you have a 12V power supply?

Or, there's always a chance that it's defective. These things are daisy-chained so if the 1st chip/LED is defective, or if there's a "crack" in the connections to the 1st chip, none of them will work.

Wow. I'm a giant moron. Thank's DVDoug (blush)