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by PiGraham
Fri Sep 21, 2018 8:59 am
Forum: Beginners
Topic: LED project help, please?
Replies: 7
Views: 162

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...
by PiGraham
Fri Sep 21, 2018 7:16 am
Forum: Other projects
Topic: Dot matrix paper feeder ideas
Replies: 11
Views: 194

Re: Dot matrix paper feeder ideas

To answer the first, each sheet layer is attached to the first by a perforated strip, this ensures that it doesn't get separated like you mentioned. Sample sheet.jpeg This is a rough procedure of what i was looking to implement. The pi would help control the mechanics and time the driving in accord...
by PiGraham
Thu Sep 20, 2018 7:42 am
Forum: General discussion
Topic: Pixy Camera
Replies: 11
Views: 5466

Re: Pixy Camera

I hope by now the community has gained a better understanding of the incredible utility of the Pixy Camera. This thing will allow a Raspberry Pi based robot to detect and recognize objects via "vision". Well, Pi based robots are using vision already, and some vision on Pi is much more sophisticated...
by PiGraham
Wed Sep 19, 2018 5:59 pm
Forum: Networking and servers
Topic: Extending Wifi Signal
Replies: 9
Views: 439

Re: Extending Wifi Signal

Try it and see. It might work. Your best chance is to get the antennas high up (>2m, but roof level if you can). Avoid any vegetation in between. If you have a directional antenna to link to the cottage you may need an omnidirectional antenna to provide all round coverage at the remote end, although...
by PiGraham
Tue Sep 18, 2018 8:23 am
Forum: Other projects
Topic: Dot matrix paper feeder ideas
Replies: 11
Views: 194

Re: Dot matrix paper feeder ideas

I think there are indeed solutions to this probem available from the printer manufacturers. Loading Special Paper You can use carbonless multipart forms of up to six parts (five copies on top of the original). Make sure you set the paper-thickness lever to the proper position based on the number of ...
by PiGraham
Tue Sep 18, 2018 8:19 am
Forum: Other projects
Topic: Dot matrix paper feeder ideas
Replies: 11
Views: 194

Re: Dot matrix paper feeder ideas

mahir wrote:
Tue Sep 18, 2018 8:05 am
So here's a gif of the process:
Image

I hope it clears things up.
Now try hand-feeding one sheet from the bottom of a pile of 20+ of those forms. How easy Is that?
by PiGraham
Tue Sep 18, 2018 8:16 am
Forum: Other projects
Topic: Dot matrix paper feeder ideas
Replies: 11
Views: 194

Re: Dot matrix paper feeder ideas

I think this is a much harder problem than you imagine. Even modern printers get paper jams, and these are mechanisms that have been honed over decades by lots of the best mechanical designers. Paper is tricky to push. A stack of 20 mutli-sheet forms seems like a difficult thing to auto-feed. How do...
by PiGraham
Mon Sep 17, 2018 4:25 pm
Forum: Graphics, sound and multimedia
Topic: Circular Display
Replies: 3
Views: 189

Re: Circular Display

We need a batch of 50 pcs for a project. Most of the circular display on AE are based on MIPI interface which is not available directly from RPI Pi has mipi DSI port for display. The official TFT uses a MIPI port. kernel drivers are available and this thread suggests that people who know what they ...
by PiGraham
Mon Sep 17, 2018 12:26 pm
Forum: General discussion
Topic: DIY POE?
Replies: 21
Views: 542

Re: DIY POE?

Sadly, as far as we know, the LAN7800 chip doesn't support a fallback mode to 100Mbit/s should the extra pairs not be available. There is still an open enquiry with Microchip over this. If you are missing the pairs then the link will simply not come up. "[email protected]" is a Boradcom term. Pres...
by PiGraham
Mon Sep 17, 2018 10:29 am
Forum: Beginners
Topic: Illuminated push button
Replies: 41
Views: 768

Re: Illuminated push button

You are probably right on that. Back to my LED question I was intending to use it as a status lamp, ie LED on when Pi is active and LED off to tell me that Pi has gone to bed and I can pull the supply if I want to. Two potential issues have come up - 1. over-current and the possible need for a resi...
by PiGraham
Mon Sep 17, 2018 10:00 am
Forum: General discussion
Topic: Raspberry Pi is a waste of time (and money).
Replies: 115
Views: 4001

Re: Raspberry Pi is a waste of time (and money).

I'd argue if a responder doesn't "have the time, energy or inclination to compose and expansive solution or explanation" then maybe it's better to not reply I completely disagree with you there. It is ridiculous to expect contributors to "compose expansive solutions". Who has time to do that on dem...
by PiGraham
Mon Sep 17, 2018 8:11 am
Forum: General discussion
Topic: DIY POE?
Replies: 21
Views: 542

Re: DIY POE?

POE equipment compatible with the 802.3af/t standards doesn't just put voltage on the wire. It negotiates what voltage to provide (up to 57 volts and power up to 30W). A DIY system would have to do that if the supply device is 802.3af/t compliant. Info about that is in the wiki https://en.wikipedia....
by PiGraham
Sun Sep 16, 2018 4:14 pm
Forum: Networking and servers
Topic: Extending Wifi Signal
Replies: 9
Views: 439

Re: Extending Wifi Signal

Just wondering how it might be possible to extend my WIFI signal an extra 300 metres or so. We have a holiday cottage close to our home and I thought this would be the easier way of offering internet to my guests. Any thoughts would be appreciated.? TPLINK EAP225 outdoor AP should give you 300+m in...
by PiGraham
Sun Sep 16, 2018 2:39 pm
Forum: Beginners
Topic: Only one USB port?
Replies: 34
Views: 540

Re: Only one USB port?

Wow that's a big hub! But are you sure it's gonna work with the Pi Zero in particular? Also it's powered as I can see? Won't that cause issues since the Pi already has power? It is tiny, and cheap. It does work with the Zero. It can use external power but it also runs well with bus power from the Z...
by PiGraham
Sun Sep 16, 2018 1:18 pm
Forum: Beginners
Topic: Only one USB port?
Replies: 34
Views: 540

Re: Only one USB port?

by PiGraham
Sun Sep 16, 2018 12:54 pm
Forum: Beginners
Topic: Only one USB port?
Replies: 34
Views: 540

Re: Only one USB port?

Hello again! So the Pi works but my USB 2.0 hub that I got today doesn't. Can I make it work somehow? I even tried another one it also doesn't work. I saw on the raspberry pi website that I can do some updates to the kernel and fix it that way but do you think that will work? Or can I install some ...
by PiGraham
Fri Sep 14, 2018 1:58 pm
Forum: Camera board
Topic: Transmitting video signal
Replies: 6
Views: 183

Re: Transmitting video signal

Although if you go the FPV route you could just use an FPV camera.
by PiGraham
Fri Sep 14, 2018 10:41 am
Forum: Camera board
Topic: Transmitting video signal
Replies: 6
Views: 183

Re: Transmitting video signal

You can get quite long range with WiFi. A quater mile should be no problem if conditions are favourable. Up to 1km should be fairly easy and CPE kit claims >10km for building to building links. Kit is available <£100. I'v had 1km between a handheld tablet connected to an Alfa AWUS036ACH USB adaptor ...
by PiGraham
Wed Sep 12, 2018 6:44 pm
Forum: Raspbian
Topic: Will people please think about low res displays?
Replies: 45
Views: 1139

Re: Will people please think about low res displays?

Yes there is an easy to design a UI for just about any resolution. Just make sure it will work in the lower res cases, and at higher resolution use larger areas for displaying things that can take advantage of it (more editing space, or larger views for rendering, etc). If you really do not like th...
by PiGraham
Wed Sep 12, 2018 11:00 am
Forum: Other projects
Topic: Let Pi remove it's own power
Replies: 5
Views: 170

Re: Let Pi remove it's own power

Hello, Thank You for your ideas! Yes I have considered a delay circiut, but if it is possible to do it in software i would prefere this. Using another micro controller to switch on/off the pi this is not an option that makes sense here (imho) because this device would consume additional power and t...
by PiGraham
Wed Sep 12, 2018 9:01 am
Forum: General discussion
Topic: How to dispose of broken lipo
Replies: 40
Views: 871

Re: How to dispose of broken lipo

Thanks for the link. Not much mention of LCB. Seems the flip case has been around 5 years and this is the first I've heard of LCB technology.
by PiGraham
Tue Sep 11, 2018 9:32 am
Forum: General discussion
Topic: How to make raspberry pi fast for image processing project (Lane Detection)?
Replies: 2
Views: 69

Re: How to make raspberry pi fast for image processing project (Lane Detection)?

Hi guys! i am using raspberry pi for image processing (Lane detection) . but pi becomes so slow during this process. one more thing that i have observed, all 4 cores of CPU are not in use. only one core is being used.So i want to ask you how can i make my raspberry pi so fast for above mentioned pr...
by PiGraham
Tue Sep 11, 2018 8:32 am
Forum: General discussion
Topic: How to dispose of broken lipo
Replies: 40
Views: 871

Re: How to dispose of broken lipo

Another form of Litium cell that may be safer than Li-Po or Li-Ion LCB ... The LCB as well as the Li-Po is a Li-Ion battery. Do not mix up associations of common sense with Li ion=cylindrical cell and Li po=pouch cell. It has nothing to do with the shape of the cell per se. It's about the chemistry...
by PiGraham
Tue Sep 11, 2018 7:52 am
Forum: General discussion
Topic: How to dispose of broken lipo
Replies: 40
Views: 871

Re: How to dispose of broken lipo

Graham you have watched the same video as I did yesterday. LCBs do sound good and I have already emailed Prologium (the manufacturer) of these batteries to see if I can buy some. However, I can not access their website but from what I have read elsewhere they are not available yet for consumers to ...
by PiGraham
Tue Sep 11, 2018 7:41 am
Forum: Raspbian
Topic: Will people please think about low res displays?
Replies: 45
Views: 1139

Re: Will people please think about low res displays?

Are there any elegant ways to scale an application GUI so that it works well over this huge range of screen sizes? It seems to me the design philosophy for large or small screen is radically different. I don't want to use a desktop WIMP GUI on a tiny screen and I don't want to use chunky minimalist ...

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