# Neopixel node does not send out signal

**URL:** <https://discourse.nodered.org/t/neopixel-node-does-not-send-out-signal/59438>\
**Category:** General\
**Created:** [6 March 2022 11:48 UTC](https://discourse.nodered.org/t/neopixel-node-does-not-send-out-signal/59438 "2022-03-06T11:48:29Z")\
**Posts on this page:** 1\
**Showing post:** 3

<div class="post-metadata">

**Author:** ![Trying\_to\_learn](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/trying_to_learn/32/28400_2.png) [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Post date:** [8 March 2022 00:02 UTC](https://discourse.nodered.org/t/neopixel-node-does-not-send-out-signal/59438/3 "2022-03-08T00:02:54Z")

</div>

Hi Nick.

I have been down this road a few times. Recently as well.

Did you do the other (pre-requisite) part:

```auto
Pre-requisites

The Neopixel python driver need to be pre-installed... The easiest way to get the driver installed is to use the Unicorn HAT drivers install script... see the Pimoroni Getting Started with Unicorn HAT page.

curl -sS get.pimoroni.com/unicornhat | bash

```

The other thing that can cause you grief if the `/boot/config.txt` file.

There are things in there what MUST be set.

[My journey into th NeoPixel world.](https://discourse.nodered.org/t/could-someone-please-tell-me-if-they-can-get-this-node-installed-and-fully-working/58848)

You need these 4 lines to be as shown:

```auto
hdmi_force_hotplug=1
hdmi_force_edid_audio = 1
hdmi_group=2
hdmi_mode=39

```

Though people will argue it is only the first two, I have recently found that the last two are also needed.

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_[View the full topic](https://discourse.nodered.org/t/neopixel-node-does-not-send-out-signal/59438)._