# Unicorn HAT - No Output **URL:** \ **Category:** Support\ **Created:** [February 3, 2015, 9:20pm UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333 "2015-02-03T21:20:23Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![Jasper](https://avatars.discourse-cdn.com/v4/letter/j/cdc98d/32.png) [@Jasper](https://forums.pimoroni.com/u/Jasper)\ **Post date:** [February 3, 2015, 9:20pm UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/1 "2015-02-03T21:20:23Z")
Hi, Just purchased a Unicorn Hat (and shiny new Pi 2) - the problem is with the Unicorn HAT. Older Pi’s have been loaned away - but thought why should the kids have all the fun! So cannot try on a another/older model. Tried both `\curl -sS get.pimoroni.com/unicornhat | bash` and a full `git clone` and `install` with a full re-image in-between. Did not notice any specific issues in the output. Power supplies - tried two different “good” 5V/2A ones. However any examples such as `sudo python ./simple.py` fail to produce any output on the LEDs - no error messages either, Are there any other debug/commands I can try. Am I missing something simple. Thanks. ---
**Author:** ![Richard](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/richard/32/508_2.png) [@Richard](https://forums.pimoroni.com/u/Richard)\ **Post date:** [February 3, 2015, 9:38pm UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/2 "2015-02-03T21:38:25Z")
I’ve been trying to get Unicorn hat running on RPi2. No luck. Works find with the RPi 1 B+ Something has changed… :( The foundations forums are down again so a bit stuck. ---
**Author:** ![MightySmooth](https://avatars.discourse-cdn.com/v4/letter/m/848f3c/32.png) [@MightySmooth](https://forums.pimoroni.com/u/MightySmooth)\ **Post date:** [February 4, 2015, 12:25am UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/3 "2015-02-04T00:25:58Z")
Same problem here :o( Brand new RPi 2 and Unicorn HAT - no output at all ---
**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\ **Post date:** [February 4, 2015, 9:30am UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/4 "2015-02-04T09:30:57Z")
The Pi 2 has changed significantly enough that the magical trickery used to make Unicorn HAT work has broken. We’re on it, don’t worry! ---
**Author:** ![Jasper](https://avatars.discourse-cdn.com/v4/letter/j/cdc98d/32.png) [@Jasper](https://forums.pimoroni.com/u/Jasper)\ **Post date:** [February 4, 2015, 10:18am UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/5 "2015-02-04T10:18:56Z")
Thanks for the update - I’ll stop going round in circles for now then. Thanks. ---
**Author:** ![andre](https://avatars.discourse-cdn.com/v4/letter/a/6de8d8/32.png) [@andre](https://forums.pimoroni.com/u/andre)\ **Post date:** [February 6, 2015, 1:37pm UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/6 "2015-02-06T13:37:07Z")
I was wondering if the I got an broken HAT or if it was just an incompatibility with the PI2. Thank you for confirming, I’ll stay tuned. ---
**Author:** ![grahamm](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/grahamm/32/3119_2.png) [@grahamm](https://forums.pimoroni.com/u/grahamm)\ **Post date:** [February 8, 2015, 10:57pm UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/7 "2015-02-08T22:57:16Z")
Wish I had read the what works and what doesn’t with the Pi 2 before ordering mine with a Unicorn HAT :(. I hope it is all solvable in software otherwise I’ll be stuck with an unusable Unicorn. ---
**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\ **Post date:** [February 9, 2015, 10:25am UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/8 "2015-02-09T10:25:18Z")
Don’t worry, it’s solvable. Getting it up and running has been one of my top priorities, since it’s something I can directly affect and don’t have to rely on anyone else to fix. Unfortunately, between the lack of documentation and lack of understanding it’s proving to be somewhat tricky! To top it all off, I had a dream last night that it was all fixed and working fine. Dream logic never works in reality :( ---
**Author:** ![Bengaul](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/bengaul/32/151_2.png) [@Bengaul](https://forums.pimoroni.com/u/Bengaul)\ **Post date:** [February 10, 2015, 8:00pm UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/9 "2015-02-10T20:00:14Z")
Agreed! New Pi and HAT. Ah well. Will get there in the end. ---
**Author:** ![huskie](https://avatars.discourse-cdn.com/v4/letter/h/a4c791/32.png) [@huskie](https://forums.pimoroni.com/u/huskie)\ **Post date:** [February 11, 2015, 11:28am UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/10 "2015-02-11T11:28:33Z")
I too spent most of last night trying to figure out why my Unicorn HAT wasn’t lighting up (connected to my Pi 2). I thought it was something I’d overlooked. I should have just come here first! I’m hoping to knock up a sound/music visualiser program for it so really looking forward to the Pi 2 compatibility update! ---
**Author:** ![CraigT](https://avatars.discourse-cdn.com/v4/letter/c/5e9695/32.png) [@CraigT](https://forums.pimoroni.com/u/CraigT)\ **Post date:** [February 14, 2015, 4:03pm UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/11 "2015-02-14T16:03:18Z")
Me too (bought a new Pi2, Unicorn HAT and a diffusion layer for the Ninja PiBow case that doesn’t fit). Glad to hear Pi2/Unicorn issue should be fixable. I just want add my appreciation for anyone who is working on this issue. Thanks. Craig ---
**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\ **Post date:** [February 14, 2015, 5:23pm UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/12 "2015-02-14T17:23:57Z")
Small update: Jon’s been tinkering with UnicornHAT this weekend, too, it’s definitely not a fatal hardware difference, but rather some new weirdness with memory caching. It’s so tantalisingly close to working that it’s driving us all completely bonkers! We’re working on pinning down exactly what’s going on, so we can upstream a fix or work around it. Stay tuned! ---
**Author:** ![Bengaul](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/bengaul/32/151_2.png) [@Bengaul](https://forums.pimoroni.com/u/Bengaul)\ **Post date:** [February 15, 2015, 4:06pm UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/13 "2015-02-15T16:06:32Z")
Best of luck. Keep us updated! ---
**Author:** ![Bengaul](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/bengaul/32/151_2.png) [@Bengaul](https://forums.pimoroni.com/u/Bengaul)\ **Post date:** [February 16, 2015, 8:42pm UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/14 "2015-02-16T20:42:49Z")
Quiet in here. Heads down, working on that tricky Unicorn HAT! ---
**Author:** ![CraigT](https://avatars.discourse-cdn.com/v4/letter/c/5e9695/32.png) [@CraigT](https://forums.pimoroni.com/u/CraigT)\ **Post date:** [February 25, 2015, 9:27pm UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/16 "2015-02-25T21:27:51Z")
Just to tie up a potential loose end. It looks like there has been some progress, a hacked version is available: [Link to Pimoroni Forum thread](http://forums.pimoroni.com/t/raspberry-pi-2-what-works-and-what-doesnt/352/63) Hopefully a fully finished and polished version will follow soon. Thanks all! ---
**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\ **Post date:** [February 25, 2015, 10:48pm UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/17 "2015-02-25T22:48:47Z")
Just to chime in- we now consider this the “release” version, it’s available in pip ``` sudo pip install unicornhat --upgrade ``` And is pretty well tested now. We’ve got some more changes coming to make it just a liiitttle bit better ( in terms of gamma correction ), but otherwise it’s case closed. Unicorn HAT is pooping rainbows like a champ again! For anyone who’s curious, the code is based upon the rpi\_ws281x, which Richard Hirst whipped up the Pi 2 fixes for- [https://github.com/richardghirst/rpi\_ws281x](https://github.com/richardghirst/rpi_ws281x) - he deserves praise and adoration! ---
**Author:** ![CraigT](https://avatars.discourse-cdn.com/v4/letter/c/5e9695/32.png) [@CraigT](https://forums.pimoroni.com/u/CraigT)\ **Post date:** [February 25, 2015, 11:12pm UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/18 "2015-02-25T23:12:38Z")
Richard Hirst - please accept our praise and adoration! IoI .o. Iol .o. Iol .o. Iol .o. Iol .o. Iol .o. Iol ---
**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\ **Post date:** [February 26, 2015, 8:57am UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/19 "2015-02-26T08:57:05Z")
I read that as “lol” first, then … I saw what you did there! Will never unsee. ---
**Author:** ![huskie](https://avatars.discourse-cdn.com/v4/letter/h/a4c791/32.png) [@huskie](https://forums.pimoroni.com/u/huskie)\ **Post date:** [February 26, 2015, 9:02am UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/20 "2015-02-26T09:02:29Z")
Marvellous!! Great work. Haven’t had to time to try it out yet but I’m looking forward to making myself blind :D ---
**Author:** ![Jasper](https://avatars.discourse-cdn.com/v4/letter/j/cdc98d/32.png) [@Jasper](https://forums.pimoroni.com/u/Jasper)\ **Post date:** [February 26, 2015, 9:26pm UTC](https://forums.pimoroni.com/t/unicorn-hat-no-output/333/21 "2015-02-26T21:26:54Z")
Working well here… Ah my eyes !!! Thanks! [Next page](https://forums.pimoroni.com/t/unicorn-hat-no-output/333.md?page=2)