# Unicorn pHat DOA?

**URL:** <https://forums.pimoroni.com/t/unicorn-phat-doa/9325>\
**Category:** Support\
**Created:** [December 10, 2018, 9:58am UTC](https://forums.pimoroni.com/t/unicorn-phat-doa/9325 "2018-12-10T09:58:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![\_si](https://avatars.discourse-cdn.com/v4/letter/_/8edcca/32.png) [@\_si](https://forums.pimoroni.com/u/_si)\
**Post date:** [December 10, 2018, 9:58am UTC](https://forums.pimoroni.com/t/unicorn-phat-doa/9325/1 "2018-12-10T09:58:57Z")

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I just purchased a unicorn pHat for my son’s GCSE engineering project to go with his brand new Pi Zero W for the project (we bought the Pimoroni Raspberry Pi Zero W Project Kit)

I wanted to do some tests to make sure its working as expected before he starts coding, but alas none of the examples do what I would expect.  
The Pi is fitted into the pimoroni case that it came with (starter kit) and the pHat is connected per the diagram ([https://pinout.xyz/pinout/unicorn\_phat](https://pinout.xyz/pinout/unicorn_phat)) using the Pogo pins until everything works as we expect.

The example scripts seem to work out that its a pHat rather than a Hat by detection and leaving AUTO as the default setting in the script.

We’ve installed the unicorn libs using " `curl -sS https://get.pimoroni.com/unicornhat | bash`" and still no good. We’ve completely re-installed the OS (stretchy) and updated everything and then done a fresh unicornhat install but still no go. It seems to stop after the first line of LEDs and then a broken signal gets through? since the other LEDs (downstream) seems to go haywaire a bit.

I’m pretty sure “bluesky\_greengrass.py” is supposed to light more LEDs and not have any red in it?  
unicornphat|666x500

Thanks  
Si

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<div class="post-metadata">

**Author:** ![alphanumeric](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/alphanumeric/32/2729_2.png) [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)\
**Post date:** [December 10, 2018, 12:35pm UTC](https://forums.pimoroni.com/t/unicorn-phat-doa/9325/2 "2018-12-10T12:35:38Z")

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Did you pogo pin all the grounds listed in the pinout?  
Pins 6,9,14,20,25,30,34 and 39.