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by PiGraham
Fri Feb 22, 2019 10:02 am
Forum: General discussion
Topic: Dual HDMI?
Replies: 12
Views: 289

Re: Dual HDMI?

Andyroo wrote:
Thu Feb 21, 2019 11:16 pm
You could try the test software https://www.raspberrypi.org/forums/view ... 3&t=216399 for the official 7” screen and an HDMI output.

I wonder if that would work for HDMI plus DPI/VGA ("Gert's VGA666)? It might, and that would allow two full size screens.
by PiGraham
Mon Feb 11, 2019 11:50 am
Forum: HATs and other add-ons
Topic: Big and cheap screen (at least 10 inch), no touch, low res
Replies: 15
Views: 6081

Re: Big and cheap screen (at least 10 inch), no touch, low res

Lord Zapus wrote:
Sat Feb 09, 2019 5:20 am
E-paper from 2019 is way better for still images like this. Also, bi-stability = extremely low power while constantly displaying image.
Are there any e-paper displays in the maker market that can render colour photos with high quality? I think that is the priority for a photo frame.
by PiGraham
Wed Jan 23, 2019 9:10 am
Forum: Graphics programming
Topic: Best way to render video inside my program?
Replies: 7
Views: 439

Re: Best way to render video inside my program?

perhaps I could use Python to display my own graphical window with static and green text overlay for a second, before automatically switching to the OMXPlayer window. That might be an idea as omxplayer does take a second or two to check the video file before it starts playing. It does. Note that th...
by PiGraham
Wed Jan 23, 2019 7:39 am
Forum: General discussion
Topic: Will a Ethernet to USB adapter give me an extra port?
Replies: 19
Views: 679

Re: Will a Ethernet to USB adapter give me an extra port?

Yes there is power in a ethernet port that is what power over ethernet is! Only if your switch provides PoE or if you use an injector. Generally ethernet ports do not provide power. Indeed, and specifically the Pi Ethernet port does not provide POE out. Unless a device specifically mentions it supp...
by PiGraham
Tue Jan 22, 2019 5:37 pm
Forum: General discussion
Topic: Will a Ethernet to USB adapter give me an extra port?
Replies: 19
Views: 679

Re: Will a Ethernet to USB adapter give me an extra port?

A bit more info from something that look the same with similar description: One end has the USB A Female end like the USB socket on a PC. The other end is the 8P8C (RJ45) Male Plug. Pin Assignment: USB A Female - RJ45Plug 1 - 1 2 - 2 3 - 3 4 - 6 S - S; The main use for this adaptor is to connect a U...
by PiGraham
Tue Jan 22, 2019 4:18 pm
Forum: General discussion
Topic: Will a Ethernet to USB adapter give me an extra port?
Replies: 19
Views: 679

Re: Will a Ethernet to USB adapter give me an extra port?

You have that wrong. The device shown plugs into a USB port and provides connection to 3G internet. It has nothing to do with Ethernet or Wi-Fi (there is a different model that also has Wi-Fi built in). I was just wondering if I could stick this into the previously mentioned USB to Ethernet adapter...
by PiGraham
Tue Jan 22, 2019 3:51 pm
Forum: General discussion
Topic: Will a Ethernet to USB adapter give me an extra port?
Replies: 19
Views: 679

Re: Will a Ethernet to USB adapter give me an extra port?

So this is meant to plug into a computer via the Ethernet port, then have a wifi dongle into the USB side? Would I be able to use a 3g USB dongle with this, then plug it into the ethernet port on my Pi? https://www.bing.com/th?id=OIP.YEpfqDV7iblrj7AxhRAyRAHaHa&pid=Api&w=1024&h=1024&rs=1&p=0 You hav...
by PiGraham
Tue Jan 22, 2019 12:00 pm
Forum: Beginners
Topic: navigation system
Replies: 17
Views: 532

Re: navigation system

As others have said, if this for your thesis you need to put the work in. You need to do more than taking existing open source sat-nav software and hooking it up to a wheelchair. A few more sub-tasks: Navigation needs a map so define how you will create and use that GPS resolution is not adequate to...
by PiGraham
Tue Jan 22, 2019 11:46 am
Forum: Assistive technology and accessibility
Topic: Project for visually impaired
Replies: 3
Views: 297

Re: Project for visually impaired

Hi, i'm doing a project for visually impaired. I need to do a bus number recognition using Raspberry Pi, Picamera, Speaker Phat and Python. Can somebody help me as i'm not good at it. How do you want it to work? What will the user do and what does the device have to work out? Thinking about how a s...
by PiGraham
Tue Dec 18, 2018 6:33 pm
Forum: General discussion
Topic: Can one pi device be use for different projects by switching out Sd card having projects on different sd and use them on
Replies: 3
Views: 135

Re: Can one pi device be use for different projects by switching out Sd card having projects on different sd and use the

Yes you can do that. It may suit you to write diferent distros to different cards. Say Raspbian for general use,, LibreElec for a Kodi media centre, Retro Pie for retro console gaming machine etc. You can install the packages for these things on the standard Raspbian distro but it will suit some peo...
by PiGraham
Thu Dec 06, 2018 7:03 pm
Forum: Automation, sensing and robotics
Topic: Tracking movement of game pieces on a board
Replies: 14
Views: 4660

Re: Tracking movement of game pieces on a board

Resurrecting this topic to post a link to an interesting device. A large format display which can sense game pieces. Not Pi related AFAIK.

https://www.smartboard-gaming.com/?fbcl ... MQYGt1af-o
by PiGraham
Thu Oct 25, 2018 3:14 pm
Forum: Graphics, sound and multimedia
Topic: Raspberry Pi (any model) as a midi encoder and interface
Replies: 6
Views: 1257

Re: Raspberry Pi (any model) as a midi encoder and interface

There are some Python MIDI libraries that you could use to issue MIDI commands or play notes when keys are pressed.
Here's one. https://pypi.org/project/pymidi/

Something here may be relevant
http://andrewdotni.ch/blog/2015/02/28/m ... spberry-p/
by PiGraham
Thu Oct 25, 2018 10:00 am
Forum: Graphics, sound and multimedia
Topic: Raspberry Pi (any model) as a midi encoder and interface
Replies: 6
Views: 1257

Re: Raspberry Pi (any model) as a midi encoder and interface

A PC keyboard has over 100 keys so there might be an option to hack a standard keyboard controller. To do your own matrix scan of 49 keys that's 7 x 7 or 14 gpio lines which should be straight forward. You can use some Arduino models as matrix scanning devices over a serial or USB interface if you h...
by PiGraham
Wed Oct 24, 2018 10:55 am
Forum: General discussion
Topic: DIY POE?
Replies: 40
Views: 2819

Re: DIY POE?

I realise it doesn't meet the zero cost requirement but if wanting to poe multiple devices then simple poe hubs can be a good solution. For example https://www.ebay.co.uk/itm/5-Ports-4-PoE-Injector-Power-Over-Ethernet-Switch-without-Power-Adapter/222561142253?hash=item33d1ad85ed:g:8P0AAOSwnK9ZUlPY ...
by PiGraham
Wed Oct 17, 2018 11:58 am
Forum: General discussion
Topic: 8 channel CCTV with Pi 3 B
Replies: 8
Views: 352

Re: 8 channel CCTV with Pi 3 B

A kit of 8ch analogue DVR and 4 cameras is probably your cheapest and easiest option. Have you looked on eBay? Aliexpress, banggood etc should also have lots of cheap options. Here's one that includes four cameras to add to the four you already have. Excludes disk drive, so if you have one spare you...
by PiGraham
Fri Oct 12, 2018 10:47 am
Forum: Automation, sensing and robotics
Topic: Object detection robot using raspberry pi
Replies: 3
Views: 571

Re: Object detection robot using raspberry pi

It will be a simpler task if you only have to detect which of a few simple shapes is in view. You can tell the difference between triangle, square and circle (for example) just by measuring the ratio of perimeter to surface area. You can get those values from "blob labelling". See OpenCV FindContour...
by PiGraham
Fri Oct 05, 2018 9:26 am
Forum: Other projects
Topic: Passcode activated start for car
Replies: 7
Views: 702

Re: Passcode activated start for car

Given the potential costs even if you are only stranded at the side of the road and need a recovery truck, it makes sense to pay for a device professionally designed for this purpose. You may even find it reduces your insurance costs rather than invalidating you cover.
by PiGraham
Thu Oct 04, 2018 1:15 pm
Forum: Other projects
Topic: Passcode activated start for car
Replies: 7
Views: 702

Re: Passcode activated start for car

If you have worked out all the caveats mentioned and want to go ahead the start-up time might be tackled : By using an Arduino which starts in a couple of seconds at most when using the bootloader or instantly if you burn you code as the boot code. Using Pi you could take a look at Ultibo which I be...
by PiGraham
Mon Oct 01, 2018 2:53 pm
Forum: Automation, sensing and robotics
Topic: Angle robot to certain angle
Replies: 5
Views: 414

Re: Angle robot to certain angle

Basically trying to replicate below robot https://www.youtube.com/watch?v=TmicYvL9QII /Chetan S. It looks like that uses the line sensor to detect when the robot has turned far enough. The sensor they use is four points, two that fall on the black line and two that fall outside the black line. Roug...
by PiGraham
Mon Oct 01, 2018 7:55 am
Forum: Automation, sensing and robotics
Topic: Angle robot to certain angle
Replies: 5
Views: 414

Re: Angle robot to certain angle

Are there lines to follow at those angles? If so you can rotate until you detect the exit line at 90, 180 or 270 then start following that. In general you can turn by an angle by driving forward on one side and back on the other for a particular time / speed (dc motor) or number of steps (stepper mo...
by PiGraham
Tue Sep 25, 2018 9:30 am
Forum: Advanced users
Topic: Netflix no longer runs on Pi
Replies: 16
Views: 13692

Re: Netflix no longer runs on Pi

gkreidl wrote:
Mon Sep 24, 2018 2:56 pm

Why not try a working solution instead of complaining that it doesn't work any more in Chromium? And it will definitely work better in kodi than inside any browser on the RPi.
Than you for your helpful solution.
by PiGraham
Mon Sep 24, 2018 9:49 am
Forum: Beginners
Topic: GPIO Pin Audio Speaker, how?
Replies: 13
Views: 1913

Re: GPIO Pin Audio Speaker, how?

Nonsense. The Pi B models use gpio to generate the audio coming out of the TRRS jack. A 4R speaker resistance is too low to be driven directly from a GPIO pin. Agreed, although that is mostly an issue in dc conditions if the gpio is held on, or off. Also, loudspeakers are inductive loads that will ...
by PiGraham
Mon Sep 24, 2018 7:48 am
Forum: Assistive technology and accessibility
Topic: Sight for the Blind for <100$
Replies: 718
Views: 155788

Re: Sight for the Blind for <100$

The camera module for the pi is OK, but it has a narrow field of view. something like 65-80 degrees whereas a wide angle lens will get 120+ degrees. You can buy wide angle lenses for the raspberry pi module, or you could use another webcam that has a wide angle lens built in. That is what we did fo...
by PiGraham
Mon Sep 24, 2018 7:41 am
Forum: Assistive technology and accessibility
Topic: Sight for the Blind for <100$
Replies: 718
Views: 155788

Re: Sight for the Blind for <100$

Hello, Folks... Pimoroni have come up with a Pi Zero with official Pi camera connector.. at a very low price. This unit is now shaved down as thin as possible.. with a single core processor. So maybe a lightweight head mounted basic vOICe without extras could be realised? john Can you provide a lin...
by PiGraham
Fri Sep 21, 2018 8:59 am
Forum: Beginners
Topic: LED project help, please?
Replies: 7
Views: 592

Re: LED project help, please?

An Aduino based on ATTiny chip that has battery connection built in is a giood choice for compact battery powered devices. Adafruit Trinket is one example. I like the Digispark / Digidtump boards that are super cheapon eBay, Banggood etc. Consider also ESP 8266 or ESP 32 boards You can of course use...

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