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by ryan88
Wed Sep 02, 2015 8:59 am
Forum: Astro Pi
Topic: Which way is Pitch and Roll
Replies: 9
Views: 2577

Re: Which way is Pitch and Roll

The reference frame for the astro-pi is shown here:

Image

I took this image from the following page:

https://www.raspberrypi.org/learning/as ... ovement.md
by ryan88
Sat Aug 29, 2015 7:58 pm
Forum: Astro Pi
Topic: Astro-Pi HAT + UART?
Replies: 3
Views: 1030

Re: Astro-Pi HAT + UART?

ShiftPlusOne wrote:Certainly. You can get an extension header with long pins which stick out through the HAT.

The site seems to be down right now, but search for REF-182684-02 on http://www.toby.co.uk/
So is the header that comes on the board removable? Then you replace it with the extension header?
by ryan88
Fri Aug 28, 2015 10:56 pm
Forum: Astro Pi
Topic: Astro-Pi HAT + UART?
Replies: 3
Views: 1030

Astro-Pi HAT + UART?

I ordered an Astro-Pi HAT from the swag store on Wednesday and it arrived this morning. I haven't had a chance to play with it yet, but I did notice that I do not have access to any of the gpio pins. I know that the HAT uses some of them, but I really need to be able to use the HAT and the UART at t...
by ryan88
Sun Aug 09, 2015 8:54 pm
Forum: Automation, sensing and robotics
Topic: UBEC [email protected]
Replies: 4
Views: 844

Re: UBEC [email protected]

Ah I see. That's great joan, thanks for your help.
by ryan88
Sun Aug 09, 2015 8:36 pm
Forum: Automation, sensing and robotics
Topic: UBEC [email protected]
Replies: 4
Views: 844

Re: UBEC [email protected]

Thanks for such a speedy response. I'm glad I can just use this directly as this way I don't have wait for something else to be delivered.

Where are the pi specs documented by the way? That way I can avoid having to trouble you with questions like this in the future.
by ryan88
Sun Aug 09, 2015 8:25 pm
Forum: Automation, sensing and robotics
Topic: UBEC [email protected]
Replies: 4
Views: 844

UBEC [email protected]

I have an ESC that has a UBEC that provides 3A at 5.25V. Would it be okay to power my pi from this? Or is the 5.25V slightly too high?
by ryan88
Mon Jul 20, 2015 3:29 pm
Forum: Astro Pi
Topic: Astro Pi HAT Weight?
Replies: 2
Views: 1032

Re: Astro Pi HAT Weight?

Thanks for that, its very helpful. Do you also happen to have the weight of the header, screws and stand-offs?
by ryan88
Sat Jul 18, 2015 5:52 pm
Forum: Astro Pi
Topic: Astro Pi HAT Weight?
Replies: 2
Views: 1032

Astro Pi HAT Weight?

I am putting together a weight budget for my project so that I know what size battery I need. Has anyone weighed their Astro Pi HAT?
by ryan88
Sun Jul 12, 2015 5:45 pm
Forum: Astro Pi
Topic: Sense HAT availability
Replies: 29
Views: 16707

Re: Sense HAT availability

Previous Raspi-associated projects have managed to keep forum members informed of progress and availability,... Model B+, Model A+, Pi2B, "official" case... Which of those were given advanced notice of when they'd be made available? Have I perchance missed your intended meaning? I thought what you ...
by ryan88
Tue Jun 30, 2015 2:57 pm
Forum: Automation, sensing and robotics
Topic: Self Balance PID Controller
Replies: 5
Views: 2033

Re: Self Balance PID Controller

That is probably because the derivative term essentially acts as a prediction. So when your robot starts to tilt, the derivative gets larger. The problem is that you subtract it rather than add it so it ends up acting in the wrong direction making the error worse.
by ryan88
Tue Jun 30, 2015 2:05 pm
Forum: Automation, sensing and robotics
Topic: Self Balance PID Controller
Replies: 5
Views: 2033

Re: Self Balance PID Controller

Your code looks fine except for the dTerm being subtracted as you pointed out. This should definitely be added not subtracted, changing this should help.

There is no real difference between your code and the other code you linked to, it is just storing the data differently in a class.
by ryan88
Tue Jun 30, 2015 11:51 am
Forum: Automation, sensing and robotics
Topic: Self Balance PID Controller
Replies: 5
Views: 2033

Re: Self Balance PID Controller

Have you tried using the Ziegler–Nichols method for tuning your PID gains?
by ryan88
Sun May 17, 2015 7:45 am
Forum: Astro Pi
Topic: Get directional vector from Yaw, Pitch & Roll
Replies: 18
Views: 12206

Re: Get directional vector from Yaw, Pitch & Roll

I understood this right up to "The easiest way to transform x, y, z coordinates based on yaw, pitch and roll (euler angles)"... Based on the first paragraph (being only bit I understood), this is what I have implemented. I apply the rotation on each axis individually and low and behold I come up wi...
by ryan88
Sat May 16, 2015 8:53 am
Forum: Astro Pi
Topic: Get directional vector from Yaw, Pitch & Roll
Replies: 18
Views: 12206

Re: Get directional vector from Yaw, Pitch & Roll

Your right, my original description of getting a directional vector is what was wrong, I didnt want a direction vector what I wanted was the ability to transform x,y,z co-ordinates based on yaw, pitch and roll. The easiest way to transform x, y, z coordinates based on yaw, pitch and roll (euler ang...
by ryan88
Mon Mar 16, 2015 8:33 am
Forum: Astro Pi
Topic: Flight Hardware Tech Specs
Replies: 9
Views: 3701

Re: Flight Hardware Tech Specs

ShiftPlusOne wrote:Yes, but they are connected to the attiny, so if you need to use them, you can modify the firmware to pass the interrupt to a GPIO pin.
I thought that the ATTINY was not programmable by the user? Or does this only apply to the ones going up on the ISS?
by ryan88
Mon Mar 16, 2015 8:30 am
Forum: Astro Pi
Topic: will it be stackable?
Replies: 8
Views: 4479

Re: will it be stackable?

The ones that will fly will be in a stack themselves, we have an RTC board which goes on first and then the Astro Pi goes on top. In the original blog post (http://www.raspberrypi.org/astro-pi/) it mentions that the Astro-Pi HAT will have a real time clock with backup battery. Has this been changed...
by ryan88
Thu Feb 05, 2015 11:40 am
Forum: Astro Pi
Topic: Release date?
Replies: 6
Views: 2661

Re: Release date?

I can't provide a straight answer to this at the moment. We're getting some of the final boards back in the next few weeks but those are going to be consumed by developers, space companies who need to test them and promotional partners. It will be announced as soon as we know. Sorry I can't be more...
by ryan88
Wed Feb 04, 2015 2:04 pm
Forum: Astro Pi
Topic: Release date?
Replies: 6
Views: 2661

Release date?

Is there an expected release date, for those of us no longer at school, to be able purchase one?
by ryan88
Tue Jan 06, 2015 12:10 pm
Forum: HATs and other add-ons
Topic: HAT with A+?
Replies: 2
Views: 844

Re: HAT with A+?

scotty101 wrote:HATs work with the A+.

Both share the same 40pin connector and mounting hole spacing.
Thanks!
by ryan88
Mon Jan 05, 2015 1:15 pm
Forum: HATs and other add-ons
Topic: HAT with A+?
Replies: 2
Views: 844

HAT with A+?

Do HATs work with the A+ board? Or is it just the B+ board?
by ryan88
Sun Jun 09, 2013 9:31 pm
Forum: Networking and servers
Topic: External access to apache web server
Replies: 7
Views: 7092

Re: External access to apache web server

Thanks for your reply, the culprit was not my router, but my NAS box! It was using UPnP to open port 80 for its self. I disabled this and now I can see apache on my pi (although its weird that I couldn't see the NAS box admin interface before)
by ryan88
Sun Jun 09, 2013 7:18 pm
Forum: Networking and servers
Topic: External access to apache web server
Replies: 7
Views: 7092

External access to apache web server

I have a model B (256MB) running the latest official release of the rasbian distribution (2013-05-25) and am trying to set up an apache2 web server on it. I installed apache2 by running the following on a fresh raspbian install: sudo apt-get update sudo apt-get upgrade sudo apt-get install apache2 A...

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