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by john_wage
Sat Apr 21, 2012 6:36 pm
Forum: Beginners
Topic: Which battery to use and charging circuit
Replies: 17
Views: 5973

Re: Which battery to use and charging circuit

Closed 5v output battery solutions will have built in charging and protection circuits, low voltage dropout, and come with their own charger.

Some really cheap or bad knock offs might not, so you should check that these features are present on the item before you buy it.
by john_wage
Sat Apr 21, 2012 3:47 pm
Forum: Beginners
Topic: Power supply cables - can I use my phone charger?
Replies: 13
Views: 53654

Re: Power supply cables - can I use my phone charger?

@jbeale

Nope, I don't have any experience with it, what I wrote was based solely on hearsay and what I've read in other places.

You might be right and it would work on a lot of, or even most systems, but I wouldn't say that the solution is a sure bet.
by john_wage
Sat Apr 21, 2012 4:33 am
Forum: Beginners
Topic: Power supply cables - can I use my phone charger?
Replies: 13
Views: 53654

Re: Power supply cables - can I use my phone charger?

<t>Cr0t said: <br/> <br/> <br/> How about one of the USB cables, which pulls the power from 2 usb ports?<br/> <br/> <br/> <br/> <br/> It is quite common for desktop systems to deploy the policy that they will initially supply up to 100mA per USB port, until the connected device negotiates via the da...
by john_wage
Fri Apr 20, 2012 12:02 am
Forum: General discussion
Topic: Powering raspi from the usb hub that it uses
Replies: 18
Views: 4422

Re: Powering raspi from the usb hub that it uses

selsinork said:


timmillwood said:


Or would that loop open up some sort of time space vortex.




I don't understand, why did Fringe Division just encase my street in amber....




INFINITE POWAAH!
by john_wage
Thu Apr 19, 2012 11:50 pm
Forum: General discussion
Topic: Solar Power
Replies: 54
Views: 16834

Re: Solar Power

<t>jbeale said: <br/> <br/> <br/> Yikes, price is a bit high, but it looks more than capable of powering the Pi.<br/> <br/> <br/> - Starting with a full battery, for a couple-three hours or so. Maybe 4 in good sun.<br/> <br/> Edit: that is not counting any display, if you want to use that in a truly...
by john_wage
Thu Apr 19, 2012 11:25 pm
Forum: General discussion
Topic: Potential power source
Replies: 83
Views: 15286

Re: Potential power source

<t>@pygmy_giant<br/> <br/> You're going in the general direction of an "UPS" or Uninterruptible Power Supply.<br/> <br/> These are commercially available for 5V setups, but building one with your own PSU + Battery will take a bit more than a capacitor, and I wouldn't say it's a very feasible beginne...
by john_wage
Thu Apr 19, 2012 11:12 pm
Forum: General discussion
Topic: Lego Case
Replies: 3
Views: 1377

Re: Lego Case

Your image link formats are faulty
by john_wage
Thu Apr 19, 2012 11:06 pm
Forum: General discussion
Topic: We've just released the schematics!
Replies: 34
Views: 9031

Re: We've just released the schematics!

Good stuff.
by john_wage
Thu Apr 19, 2012 10:16 pm
Forum: General discussion
Topic: Potential power source
Replies: 83
Views: 15286

Re: Potential power source

@pygmy_giant

mAh is not an indicative for current draw capacity.

batteries don't usually have any fixed upper limit for current draw, if you draw too much they will heat up and sometimes destruct, this is in the areas where you are talking about partial shorting.
by john_wage
Thu Apr 19, 2012 10:07 pm
Forum: General discussion
Topic: MS SmallBASIC
Replies: 27
Views: 11247

Re: MS SmallBASIC

SmallBASIC != MS Small Basic
by john_wage
Thu Apr 19, 2012 8:32 pm
Forum: Off topic discussion
Topic: Hack that (Cardboard) Box!
Replies: 3
Views: 971

Re: Hack that (Cardboard) Box!

I believe it's also possible to use it as-is as a storage container for the RPi when it's not in use!
by john_wage
Thu Apr 19, 2012 5:33 pm
Forum: General discussion
Topic: CE and ROHS testing
Replies: 4
Views: 1158

Re: CE and ROHS testing

You can't call it RoHS compliant if the PCB contains hazardous materials
by john_wage
Thu Apr 19, 2012 5:10 pm
Forum: General discussion
Topic: CE and ROHS testing
Replies: 4
Views: 1158

Re: CE and ROHS testing

Afaik there is no testing for RoHS.. it just requires that the components you've used does not violate RoHS standards.
by john_wage
Thu Apr 19, 2012 5:04 pm
Forum: Other projects
Topic: first design for an hdmi to lvds adapter
Replies: 78
Views: 81069

Re: first design for an hdmi to lvds adapter

<t>The major downer with all the ones I've found already is they are very BULKY mainly because they have features not needed!<br/> <br/> For instance they convert analog (VGA or RCA) signals also.. the entire IC used for converting analog signals is completely useless.. dead space. Digital to digita...
by john_wage
Thu Apr 19, 2012 4:53 pm
Forum: Other projects
Topic: A basic acrylic enclosure for developers
Replies: 29
Views: 10313

Re: A basic acrylic enclosure for developers

It's pretty, *thumbs up*
by john_wage
Thu Apr 19, 2012 4:45 pm
Forum: General discussion
Topic: Protecting GPIO pins
Replies: 29
Views: 7044

Re: Protecting GPIO pins

<t>Honestly I don't think it's that great of a problem, it just sounds bad.<br/> <br/> I use powered on electronics without cases every day, you should never handle your powered-on boards with any metal objects in hand, if you must, use very steady hands.<br/> <br/> Also never handle a powered (or r...
by john_wage
Thu Apr 19, 2012 4:37 pm
Forum: Other projects
Topic: My Mapping App.
Replies: 3
Views: 1374

Re: My Mapping App.

Only direct limitations I can think of is the small RAM you have to work with.

Generally speaking map sizing are directly reflected in memory usage.
by john_wage
Thu Apr 19, 2012 4:33 pm
Forum: Other projects
Topic: Raspberry Pi... In a laptop
Replies: 4
Views: 2733

Re: Raspberry Pi... In a laptop

<r>Asus did something pretty similar to what you seem to were talking about, it's called the EeePad.<br/> <br/> <URL url="http://www.asus.com/Eee/Eee_Pa.....mer_TF101/">http://www.asus.com/Eee/Eee_Pa.....mer_TF101/</URL><br/> <br/> If nothing else, maybe you can steal some of their ideas for your ow...
by john_wage
Thu Apr 19, 2012 4:25 pm
Forum: Beginners
Topic: Raspberry Pi LCD screen compatibility
Replies: 2
Views: 10346

Re: Raspberry Pi LCD screen compatibility

<t>Like MikeyB suggests, you'll most certainly need a battery as bridge between the panels and the RPi, most of the time the panels will only prolong the battery life, I don't think the panels alone will supply enough current for display, RPi, + computing, + your connected hardware. Unless you have ...
by john_wage
Thu Apr 19, 2012 4:07 pm
Forum: Beginners
Topic: My first C++ program
Replies: 16
Views: 8617

Re: My first C++ program

<t>@lb<br/> <br/> Depends what your entry level is really. If you are completely new to programming at all then yeah, there are better ways to get into the "programming mindset".<br/> <br/> If you have some experience from maybe HMTL, Java-Script, or other easy, well documented scripting languages t...
by john_wage
Thu Apr 19, 2012 3:58 pm
Forum: General discussion
Topic: VGA Monitor and Wi-Fi with the Raspberry Pi
Replies: 29
Views: 9483

Re: VGA Monitor and Wi-Fi with the Raspberry Pi

<t>@Bollard<br/> <br/> Anything bought like post-2003 (guesstimate) should have at least DVI-Digital to compliment the VGA.<br/> <br/> If not, you got ripped off by someone trying to vent outdated stocks, this is quite common since it's hard for an inexperienced user to tell the difference between a...
by john_wage
Thu Apr 19, 2012 11:36 am
Forum: Other projects
Topic: Lego case project
Replies: 68
Views: 83571

Re: Lego case project

Nice case. The guys standing on top of it made me laugh.
by john_wage
Thu Apr 19, 2012 11:19 am
Forum: Troubleshooting
Topic: Not booting up, stuck on Power LED, no OK LED.
Replies: 48
Views: 14748

Re: Not booting up, stuck on Power LED, no OK LED.

<t>Writing a Linux OS image to a device while using Windows can sometimes be a PITA, I know from experience (other platforms, not RPi).<br/> <br/> Even if you are following all the steps correctly, some systems just won't bloody work.. Cosmic balance or some magic stuff going on.<br/> <br/> Even if ...
by john_wage
Thu Apr 19, 2012 8:57 am
Forum: Beginners
Topic: My first C++ program
Replies: 16
Views: 8617

Re: My first C++ program

<t>The entire idea behind Templates in C++ is to make very large projects more easily maintained. Using them in a small application doesn't hurt of course, but by the time you are making projects that would take any significant use of templates you'd already be way past the beginner stages of C++.<b...
by john_wage
Thu Apr 19, 2012 5:12 am
Forum: Troubleshooting
Topic: Win 32 disk imager
Replies: 47
Views: 94844

Re: Win 32 disk imager

@markb

that's interesting

@OP

if nothing else works you could always try UNetbootin instead.

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