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by PiGraham
Sun Sep 16, 2018 4:14 pm
Forum: Networking and servers
Topic: Extending Wifi Signal
Replies: 9
Views: 1722

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: 831

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: 831

Re: Only one USB port?

by PiGraham
Sun Sep 16, 2018 12:54 pm
Forum: Beginners
Topic: Only one USB port?
Replies: 34
Views: 831

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: 332

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: 332

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: 1590

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: 289

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: 1117

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: 96

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: 1117

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: 1117

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: 1590

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 ...
by PiGraham
Mon Sep 10, 2018 9:04 am
Forum: General discussion
Topic: How to dispose of broken lipo
Replies: 40
Views: 1117

Re: How to dispose of broken lipo

Another form of Litium cell that may be safer than Li-Po or Li-Ion
LCB

https://www.youtube.com/watch?v=kJXRyWQgOY4


Capacity is low but flexibility and / or safety when damaged may be more important in some uses.
by PiGraham
Fri Sep 07, 2018 9:00 pm
Forum: General discussion
Topic: How to dispose of broken lipo
Replies: 40
Views: 1117

Re: How to dispose of broken lipo

Never mind the water. LIPOs go on fire and burn very well without water. That is why MS sends you flame retardant packaging in which to return swelling Surfaces and Laptops. And then gets them picked up by courier service. They do indeed, and you can dump LiPo in water but you shouldn't do that wit...
by PiGraham
Fri Sep 07, 2018 8:58 pm
Forum: General discussion
Topic: How to dispose of broken lipo
Replies: 40
Views: 1117

Re: How to dispose of broken lipo

We are talking about LIPO batteries. Put them in salted water. Worrying about LIPO batteries containing Lithium burning in water is like worrying about salt burning in water because it contains Sodium. No It isn't. Don't just assume that all white crystals are salt. Not all lithium batteries are Li...
by PiGraham
Fri Sep 07, 2018 7:36 pm
Forum: General discussion
Topic: How to dispose of broken lipo
Replies: 40
Views: 1117

Re: How to dispose of broken lipo

The TLDR version seems to be you put Lithium Polymer batteries in water safely because they don't contain lithium metal but at least some Lithium Ion batteries do contain metal that could ignite in water. So make sure you know what your battery is.
by PiGraham
Fri Sep 07, 2018 9:56 am
Forum: General discussion
Topic: USB Powerbank that does not switch off when idle?
Replies: 5
Views: 244

Re: USB Powerbank that does not switch off when idle?

I have noticed that most powerbanks need a minimum load to turn on and stay on. In one case I connected some resistors to draw 100mA and that activates the powerbank and keeps it on. Can you send the exact details, which powerbank that was? It's a lottery. Packs that turn on when a load is connecte...
by PiGraham
Fri Sep 07, 2018 9:43 am
Forum: General discussion
Topic: How to dispose of broken lipo
Replies: 40
Views: 1117

Re: How to dispose of broken lipo

It depends on where you are. Batteries generally contain nasty elements that shouldn't go to landfill, but how you deal with them is difficult. I'm lucky; my local Tesco's has a used battery recycling point. Your mileage will definitely vary. I've read that the materials in LiPo batteries are non-t...
by PiGraham
Wed Sep 05, 2018 5:34 pm
Forum: General discussion
Topic: USB Powerbank that does not switch off when idle?
Replies: 5
Views: 244

Re: USB Powerbank that does not switch off when idle?

Is there some dedicated powerbank to power electronic gadgets in a housing without the need to switch them on manually? How do you power your projects? Do you mean that you want an Arduino or a Pi to be able to turn the power ON automatically? Without some power no processor can do anything, but yo...
by PiGraham
Wed Sep 05, 2018 5:10 pm
Forum: General discussion
Topic: How to dispose of broken lipo
Replies: 40
Views: 1117

Re: How to dispose of broken lipo

Which, though slightly off-topic, also brings up the case of how to dispose of non-damaged power-packs, also the power pack part for e-cigarettes, any product with an embedded LiPo. They usually have a cut-off which won't allow full discharging of the battery cells. That's a good point which may ac...
by PiGraham
Wed Sep 05, 2018 3:45 pm
Forum: General discussion
Topic: USB Powerbank that does not switch off when idle?
Replies: 5
Views: 244

Re: USB Powerbank that does not switch off when idle?

I have noticed that most powerbanks need a minimum load to turn on and stay on. In one case I connected some resistors to draw 100mA and that activates the powerbank and keeps it on. If you can arrange your 'ON' switch to connect the USB +%V pin to GND via a resistor that will probably turn the powe...
by PiGraham
Wed Sep 05, 2018 2:07 pm
Forum: General discussion
Topic: How to dispose of broken lipo
Replies: 40
Views: 1117

Re: How to dispose of broken lipo

PiGraham, I think it's best to avoid combustion or explosion by only using slow discharge methods. That is very sensible advice. But where is the fun in it? If someone wanted to that sort of 'fun' then should know what they are getting into and take appropriate precautions. It wouldn't be any fun a...
by PiGraham
Wed Sep 05, 2018 12:47 pm
Forum: General discussion
Topic: How to dispose of broken lipo
Replies: 40
Views: 1117

Re: How to dispose of broken lipo

Isn't there a risk of setting fire to the lithium in a broken cell by immersing it in water? Yes, I believe that's true. Which is why most disposal guides say don't do that if damaged; don't immerse in water, don't attempt to discharge. The guide quoted above doesn't say that though, which surprise...
by PiGraham
Wed Sep 05, 2018 12:44 pm
Forum: General discussion
Topic: How to dispose of broken lipo
Replies: 40
Views: 1117

Re: How to dispose of broken lipo

So the best thing is to ensure it has no energy left to do any damage before disposing of it. Stab it with a fork ,drive nails through it. Be sure to do this somewhere that won't burn and protect yourself. When it has burned down think about where to dispose of the remains. Just yesterday Microsoft...

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