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by perfo
Mon Jan 27, 2020 5:46 pm
Forum: Other projects
Topic: Live Hologram Display
Replies: 6
Views: 516

Re: Live Hologram Display

Poly(methyl methacrylate) Chemical Compound Poly(methyl methacrylate) Poly(methyl methacrylate), also known as acrylic, acrylic glass, or plexiglass as well as by the trade names Crylux, Plexiglas, Acrylite, Lucite, Perclax and Perspex among several others, is a transparent thermoplastic often used ...
by perfo
Sun Jan 19, 2020 1:57 pm
Forum: Other projects
Topic: Live Hologram Display
Replies: 6
Views: 516

Re: Live Hologram Display

Yep just a flat piece of glass, perspex etc. With something black behind and either side it will still look the part from the front. The image will be a little distorted depending on what angle you put the glass at. But I've found this may or may not be a problem depending on what you are displaying...
by perfo
Fri Jan 10, 2020 5:10 pm
Forum: Other projects
Topic: RPI controlled EDM drilling
Replies: 0
Views: 116

RPI controlled EDM drilling

https://www.youtube.com/watch?v=rpHYBz7ToII I fancy trying to make and EDM drilling machine like the one in the youtube link above.. I've scoured the internet and can't find out the exact details but I've gleaned the current has to be pulsed with an unequal mark space ration so something like 30Khz...
by perfo
Fri Jan 10, 2020 4:48 pm
Forum: Other projects
Topic: Live Hologram Display
Replies: 6
Views: 516

Re: Live Hologram Display

I guess you mean the Hologram effects shown on YouTube and the like made from a bit of plastic cut and stuck together like an truncated , inverted pyramid and placed on a screen? If so then I agree they do look great and I have made a couple myself. As for you application, do you need to to see the ...
by perfo
Thu Nov 14, 2019 8:38 am
Forum: Graphics, sound and multimedia
Topic: Recorder Based Pipe Organ
Replies: 4
Views: 339

Re: Recorder Based Pipe Organ

Makes sense I guess. Thanks for the info...
by perfo
Fri Nov 08, 2019 10:06 pm
Forum: Graphics, sound and multimedia
Topic: Recorder Based Pipe Organ
Replies: 4
Views: 339

Re: Recorder Based Pipe Organ

Thanks for the input. You are totally correct in your assessement. After posting I stumbled accross a python module called MIDO this decodes MIDI files (and does a lot of other things). Now I've seen inside the file I think it may be easier than I orignially thought. As you said the file contains a ...
by perfo
Fri Nov 08, 2019 2:25 am
Forum: Graphics, sound and multimedia
Topic: Recorder Based Pipe Organ
Replies: 4
Views: 339

Recorder Based Pipe Organ

Hello my learned friends. I've seen this on you tube https://www.youtube.com/watch?v=c7SNmeGiLHs And simple put , I've got to have one. :shock: Problem is I know nothing of music, notes, pipe organs and very little on MIDI. But I'm OK with the RPI , Python and electronics so how hard can it be :-) M...
by perfo
Mon Apr 15, 2019 8:47 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: interface with digital calipers
Replies: 52
Views: 11518

Re: interface with digital calipers

I find it handy to have absolute positions (relative to end stops) and relative positions but with the RPI and big screen you can have as many as you like...
by perfo
Sat Apr 13, 2019 11:42 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: interface with digital calipers
Replies: 52
Views: 11518

Re: interface with digital calipers

I like the look of that.
An RPI with a big monitor and some extra functionality like relative positions etc would finish it off .. Oh and maybe a box or tow but then half my stuff never actually makes it in to a proper housing...
by perfo
Fri Mar 29, 2019 11:55 am
Forum: General programming discussion
Topic: Read Pixel colour from screen.
Replies: 20
Views: 2467

Re: Read Pixel colour from screen.

So could I feed it jpegs with a C script ?
So I'd feed it jpeg 1 then switch my GPIO on then feed it Jpeg 2 then GPIO off etc ?
by perfo
Thu Mar 28, 2019 11:48 am
Forum: General programming discussion
Topic: Read Pixel colour from screen.
Replies: 20
Views: 2467

Re: Read Pixel colour from screen.

Great thanks. another avenue to explore this weekend.
by perfo
Thu Mar 28, 2019 11:01 am
Forum: General programming discussion
Topic: Read Pixel colour from screen.
Replies: 20
Views: 2467

Re: Read Pixel colour from screen.

out of interest , would you know of a player that does the opposite of Mencoder ? That's is I give it jpegs and it plays them as a video ?
by perfo
Thu Mar 28, 2019 11:00 am
Forum: General programming discussion
Topic: Read Pixel colour from screen.
Replies: 20
Views: 2467

Re: Read Pixel colour from screen.

Thanks for the suggestion. I've got a few things to have a bash at this weekend....
by perfo
Wed Mar 27, 2019 1:01 pm
Forum: General programming discussion
Topic: Read Pixel colour from screen.
Replies: 20
Views: 2467

Re: Read Pixel colour from screen.

Ah the ol reliable VLC... I'll give it a bash and see what happens...
Thanks
by perfo
Wed Mar 27, 2019 11:30 am
Forum: General programming discussion
Topic: Read Pixel colour from screen.
Replies: 20
Views: 2467

Re: Read Pixel colour from screen.

Do you know of any players I could try ?
by perfo
Wed Mar 27, 2019 9:32 am
Forum: General programming discussion
Topic: Read Pixel colour from screen.
Replies: 20
Views: 2467

Re: Read Pixel colour from screen.

Thanks for the detailed answer you put some effort I to it and that is appreciated. I did manage to get pixel stuff from the FB but as JamesH points out that was before I found out OmxPlayer didn't use the frame buffer and thus I couldn't make head nor tail out of the info I was managing to get. I b...
by perfo
Sun Mar 24, 2019 8:28 pm
Forum: Automation, sensing and robotics
Topic: Read Data from Pi without WIFI
Replies: 3
Views: 387

Re: Read Data from Pi without WIFI

Thanks for the answers. If I could find an app that already does it over blue tooth for apple and android then that would be a great possibility (though I haven't found one yet). I could write one for android (possibly) but it's far too much faff to publish one for apple stuff. The problem with your...
by perfo
Sun Mar 24, 2019 2:42 am
Forum: Automation, sensing and robotics
Topic: Read Data from Pi without WIFI
Replies: 3
Views: 387

Read Data from Pi without WIFI

Hello All, I'm not quite sure how to word this question so I will start with what I am trying to achieve. The RPI will be happily reading data presented to its GPIO and I want to be able to view this data on a standard phone. The easiest way I can think of is set up the RPI as a web server and creat...
by perfo
Thu Mar 14, 2019 4:56 pm
Forum: General programming discussion
Topic: Read Pixel colour from screen.
Replies: 20
Views: 2467

Re: Read Pixel colour from screen.

Thanks for the tips James... I'm using omxplayer to play a video and trying to grab a pixel from that and so far I wasn't getting much sense. Maybe you've just explained why that is... I have other posts on this forum asking questions as I've tried different ways to achieve my project. My project is...
by perfo
Thu Mar 14, 2019 12:48 pm
Forum: General programming discussion
Topic: Read Pixel colour from screen.
Replies: 20
Views: 2467

Re: Read Pixel colour from screen.

Hello Jamesh I only want to read one pixel per frame no matter what the resolution is. I was hoping with only reading one it may enable it to be speedy enough, I'm not interested in the camera for this application so that's not a problem but what do you mean by the video display is not presented to ...
by perfo
Thu Mar 14, 2019 10:10 am
Forum: General programming discussion
Topic: Read Pixel colour from screen.
Replies: 20
Views: 2467

Re: Read Pixel colour from screen.

Thanks Andyroo.

The thing is I need to do this live so whatever method I use has to be able to process it at least as fast as the frame rate of the video (ie 60 FPS)
by perfo
Thu Mar 14, 2019 8:44 am
Forum: General programming discussion
Topic: Read Pixel colour from screen.
Replies: 20
Views: 2467

Read Pixel colour from screen.

I've put this in the general programming as I'm open to suggestions whether in C or python. I would prefer python as I understand it a lot more but maybe able to work with C if it isn't too complex. So As I stated I want to pick a pixel at (X,Y) being displayed on screen (HDMI output). is the Frame ...
by perfo
Thu Mar 14, 2019 8:35 am
Forum: Graphics, sound and multimedia
Topic: Shutter Glasses
Replies: 5
Views: 828

Re: Shutter Glasses

I'm not getting any tearing though so the frame vs refresh can't be that far out of sync...
Is there any way to force the fps and refresh to be in sync ?
by perfo
Thu Mar 14, 2019 8:33 am
Forum: OpenMAX
Topic: Display image as fast as possible
Replies: 7
Views: 4600

Re: Display image as fast as possible

Problem with me is I believed the hype about basic and vba / visual basic being the future when MS decided to include it in there packages. I started with C , fortran , pascal and the usual crew but dropped them 30 years ago.. Not that I was particularly good then but my older brain has difficulty g...
by perfo
Wed Mar 13, 2019 9:32 pm
Forum: OpenMAX
Topic: Display image as fast as possible
Replies: 7
Views: 4600

Re: Display image as fast as possible

Nope still no closer.
Is there a way python can render images using the GPU ? Maybe some sort of MMAL interface that hides all the complexities from me ?

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