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by perfo
Sun Mar 10, 2019 2:58 am
Forum: Graphics, sound and multimedia
Topic: Shutter Glasses
Replies: 5
Views: 726

Re: Shutter Glasses

Well thanks for all your comments folk :-) I've included what I've found incase it helps someone else. I finally discounted most avenues as they didn't keep in sync or gave other problems . The DPI and HDMI can be set up to mirror one an another and makes it easy to grab the Vsync off the GPIO but t...
by perfo
Wed Mar 06, 2019 3:10 am
Forum: Graphics, sound and multimedia
Topic: Shutter Glasses
Replies: 5
Views: 726

Re: Shutter Glasses

There is a great tut on stop motion film making here https://projects.raspberrypi.org/en/projects/push-button-stop-motion Using the code from there avconv -r 10 -i animation/frame%03d.jpg -qscale 2 animation.h264 to make a file out of my frames and then omxplayer animation.h264 to play it This works...
by perfo
Wed Mar 06, 2019 2:57 am
Forum: Graphics, sound and multimedia
Topic: Shutter Glasses
Replies: 5
Views: 726

Re: Shutter Glasses

I've done a bit of reading up on stop motion photography. This kind of application would be perfect for my needs as I simply need to show one image after another but in quick succession. However I can't seem to find a good tut on how to show a series of frames or images with the PI. Does anyone know...
by perfo
Tue Mar 05, 2019 4:20 am
Forum: Graphics, sound and multimedia
Topic: Shutter Glasses
Replies: 5
Views: 726

Shutter Glasses

Hello All, I'm hoping someone out there may have some pointers as to the best approach for this project of mine. I'm using a pair of shutter glasses and hacked it so the RPI can control the glasses direct which is pretty simple. I would like to switch between two images then toggle an output pin. So...
by perfo
Thu Jan 05, 2017 5:47 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: interface with digital calipers
Replies: 52
Views: 10755

Re: interface with digital calipers

In reply to ewanpth Could it be you are either not clearing some variables or buffers and thus compounding the numbers or maybe as you are delaying things is the reading not being taken over the full (right) set of data bits ? Did anyone have a go connecting these cheap things together to make a lon...
by perfo
Thu Dec 10, 2015 5:09 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: interface with digital calipers
Replies: 52
Views: 10755

Re: interface with digital calipers

Ah yes makes sense..
by perfo
Sat Dec 05, 2015 9:54 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: interface with digital calipers
Replies: 52
Views: 10755

Re: interface with digital calipers

One step even easier then...thanks..
by perfo
Fri Dec 04, 2015 9:30 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: interface with digital calipers
Replies: 52
Views: 10755

Re: interface with digital calipers

I think what he means is do a check on the clock pulse ... Ie if the clock pulse is high (or low depending on which state you are looking for) do a while loop until it changes state. Whilst in the while loop have a counter increment. At the end of the while have a look at the counter and if it is lo...
by perfo
Sun Oct 18, 2015 11:55 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: interface with digital calipers
Replies: 52
Views: 10755

Re: interface with digital calipers

Ok thanks. I have already ordered soem from hong kong and hoped they would eb the same but If I can get mine to work at least I know where to go to get one that does.. I've got two of these http://www.ebay.co.uk/itm/271993321208?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT £6.90 for tw...
by perfo
Sun Oct 18, 2015 9:35 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: interface with digital calipers
Replies: 52
Views: 10755

Re: interface with digital calipers

What actual model of Caliper did you use Joan ?
by perfo
Wed Oct 14, 2015 12:13 pm
Forum: Automation, sensing and robotics
Topic: Tracking movement of game pieces on a board
Replies: 14
Views: 5451

Re: Tracking movement of game pieces on a board

The reed switch idea works of course but relies on a memory map in the controller to know where the pieces are it will know a piece is on this square but which piece is there will be unknown. Unless you could use maybe five reed switches under each square and identify the 32 pieces with a binary sig...
by perfo
Tue Oct 13, 2015 12:55 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: interface with digital calipers
Replies: 52
Views: 10755

Re: interface with digital calipers

Thanks good to know....
by perfo
Mon Oct 12, 2015 7:42 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: interface with digital calipers
Replies: 52
Views: 10755

Re: interface with digital calipers

If the axis is moved quick the display on the caliper lags but then catches up ? Is that what you found? What about the PI though? If i'm understanding it right the caliper sends out a relative position from some arbitrary start point and thus even if the PI missed a load of data then it would still...
by perfo
Mon Oct 12, 2015 12:40 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: interface with digital calipers
Replies: 52
Views: 10755

Re: interface with digital calipers

Had another one of them thoughts. Would the PI be able to handle three axis then ?
Do the readers offer any sort of buffering ? If someone moved the scale too fast would it miss a few steps or catch up on next read ?
Thanks...
by perfo
Mon Oct 12, 2015 12:37 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: interface with digital calipers
Replies: 52
Views: 10755

Re: interface with digital calipers

Thanks for that, Perfect bit of investigation work.. I would have replied sooner and offered my thanks but somehow I got locked out of this here forum. Still I'm back and giving thanks... Now I'll definitely have to buy some and see if I can link them together multiple 300mm ones for a couple of £ e...
by perfo
Thu Sep 17, 2015 8:14 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: interface with digital calipers
Replies: 52
Views: 10755

Re: interface with digital calipers

Thanks for the link. I guess I'm going to have to buy a few and play then.
by perfo
Sun Sep 13, 2015 2:16 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: interface with digital calipers
Replies: 52
Views: 10755

Re: interface with digital calipers

yep that's what I'm worried about but haven't enough knowledge to be definitive...

I had seen that tutorial but really I was hoping for a complete project with a software example I could try and figure out...
by perfo
Sun Sep 13, 2015 1:17 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: interface with digital calipers
Replies: 52
Views: 10755

Re: interface with digital calipers

If it were easy to splice two inexpensive devices to work the same as one expensive one, the manufacturer would have probably noticed. Yep I would totally agree but still I wonder what the differences are. If you look at these pics https://www.flickr.com/photos/[email protected]/5227386500/ The track ap...
by perfo
Sun Sep 13, 2015 1:06 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: interface with digital calipers
Replies: 52
Views: 10755

Re: interface with digital calipers

Thanks for the reply. You've hit two problems on the head though... "A good tutorial with the Arduino"- I haven't found one with enough details yet "It should be easy to convert" - I agree it may indeed be easy for someone but not for me :) The hardware is obviously very different between RPI and Ar...
by perfo
Sat Sep 12, 2015 10:25 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: interface with digital calipers
Replies: 52
Views: 10755

interface with digital calipers

Hello, I've done a fair bit of reading and researching on this but haven't really come up with a definitive answer. I have a small lathe and would like to put DRO's on it but they are expensive. On the old google and in the walls of this forum I have read about folks connecting and reading data from...
by perfo
Sat Sep 12, 2015 9:04 pm
Forum: Advanced users
Topic: Limits of Multithreading
Replies: 10
Views: 6534

Re: Limits of Multithreading

I know it's nearly a year old but how did you get on with this project ? I want to do something similar. I'm my tinkering even though the PI is capable of these things (especially the new speedy version) I prefer to hand off real world real time things to other devices. So I'd be using the pi to int...
by perfo
Mon Aug 10, 2015 7:13 pm
Forum: Automation, sensing and robotics
Topic: A bluetooth chessboard
Replies: 12
Views: 6069

Re: A bluetooth chessboard

Ah yes I'm on hols and 8 pints down but it does makes sense (to me). Perfect then except only being able to Id the piece from memory only.
by perfo
Mon Aug 10, 2015 6:37 pm
Forum: Automation, sensing and robotics
Topic: A bluetooth chessboard
Replies: 12
Views: 6069

Re: A bluetooth chessboard

A normal keyboard (scanner) with. Diodes at the crossing points, I'll have to think about that one (not suggesting any one is wrong of course).
by perfo
Mon Aug 10, 2015 12:38 pm
Forum: Automation, sensing and robotics
Topic: A bluetooth chessboard
Replies: 12
Views: 6069

Re: A bluetooth chessboard

I think that would be the problem of using a keyboard scanner in that you have 32 keys pressed at the same time...
by perfo
Mon Aug 10, 2015 11:24 am
Forum: Automation, sensing and robotics
Topic: Tracking movement of game pieces on a board
Replies: 14
Views: 5451

Re: Tracking movement of game pieces on a board

what about rfid's a small rfid in each chess piece then a coil under each square. The coils would have to be connected to then sampled so some sort of multiplexing would be needed or maybe have 64 inputs and try and read them in software. This isn't a highly thought out idea of mine :) but it would ...

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