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511  Using Arduino / Networking, Protocols, and Devices / Re: Securing arduino as server on: February 05, 2014, 01:49:56 am
I'm not sure I follow.

If you use w5100 wiznet it can handle 4 max sockets, you're better off using php/appache, if it's only every now and then you coulx use an ethernet and arduino...

Can you expand your question?
512  Using Arduino / General Electronics / Re: 1 Digital In to 10 Digital Out (almost a DA) on: February 04, 2014, 11:46:24 pm
If you never need the ability to control each individual relay...

You could use a cheaper transistor like a tip31 (3amps) otherwise you might be better off using a unl2803,  from each of your shift register pins, are you using flyback diodes with the arrays or using a prebuilt board?... if it's a board with relay and transistors and what not,  a simple npn/pnp should switch them all on ok.


http://www.ti.com/lit/ds/symlink/uln2803a.pdf
513  Using Arduino / General Electronics / Re: Arduino Battery Charger, Meter on: February 04, 2014, 11:37:21 pm
Maybe I'm alone on this one...

But where do larger (fair enough if you're starting a business and need help) companies get off, asking for help on big projects like this, if they have money for the hardware then they should invest in expertise and pay them to do the job... unless the op is the "expert" in which case... hahahaha.
514  Using Arduino / General Electronics / Re: multi voltage step down on: February 04, 2014, 11:21:37 pm
Entirely depends on the current requirements...

Last night I used a tip41 (rated 6 amps) 14.5v on it's collector, 5v on it's  base from a 5v 7805 regulator, the 7805 stayed cool andfrom the emitter I powered an Arduino and 2 shift registers..

Still transistor still got hot.... if the current draw  is too high think about using a switching regulator or a large heatsink.
515  Using Arduino / General Electronics / Re: Flow of electricity - Simple Circuits on: February 04, 2014, 11:09:54 pm
With your car analogy. ..

Think of a resistor as a speed limit, the road (single series circuit anyway) is the wire, the cars all travel at the speed set by the total resistance...

The speed limit affects all cars on that one road before and after (single series circuit) so if we have 2 resistors on the same road combine the value and the resistance equal how fast the cars travel, and they all move at the same speed, decrease the resistance the faster the cars go, on both sides of the resistor.

Now stick an led into the mix, the led will consume (providing threshold voltage met) everything you give it, too many cars/current/electrons will blow it, so you add a speed limit to control the current.. so remember that the resistor slows the electrons down regardless where you place it in a single series circuit.

516  Using Arduino / General Electronics / Re: new components on: February 04, 2014, 06:04:11 pm
You're selfish, ungrateful,  disrespectful and lazy. And a liar depending on your own personal beliefs.

After being told where to go and what to read you can't because you're poor?  But then you say things like I'm going to buy a rpi? Obviously you have enough money compared to a poor african living in squalor, so choose your words wisely.

Since you know all the component names, why don't you use your skills to find examples of how to use these components like every other person here!


517  Using Arduino / General Electronics / Re: new components on: February 04, 2014, 04:51:05 pm
I'd love to know how he's able to write code on a device, compile and upload it from a mobile device from 2004... smiley-eek-blue
518  Using Arduino / General Electronics / Re: new components on: February 04, 2014, 04:44:16 pm
You know what disrespect is?

Expecting UNPAID helpers who give up their time to help people who have no interest in helping themselves... go to an electronic store and ask them the same questions.
519  Using Arduino / Project Guidance / Re: Controlling an Android phone using Arduino on: February 03, 2014, 09:01:43 pm
Hmmmm....what?

Why bother with an Arduino at all?  You need to root the android device, then use adb from command line,  then you can uninstall, make calls do whatever you wish, or write an app in java which gives super user rights via the shell and again uninstall apps etc.
520  Using Arduino / General Electronics / Re: new components on: February 03, 2014, 08:57:41 pm
This is why nasa does not have a public forum lol...

What concerns me is... where did he get all the terminology from (zener, flyback etc) to begin with and why is he not using a search engine?

Diodes like transistors behave differently based on how you wire it up, get googling.
521  Using Arduino / General Electronics / Re: What is this? on: February 03, 2014, 08:53:26 pm
You know what, you could use the ic chips to pin back the curtains or other fabric  (using 2 ics to clamp together)
522  Using Arduino / General Electronics / Re: SSR with Android - Do i need a resistor here? on: February 03, 2014, 08:50:21 pm
No harm will result from adding a resistor when you're unsure. 
And better that than the way so many around here go about things.


So there is no instance where adding a resistor can cause harm?

I bet it could, thinking along the lines of sensors used for safety, eg if you used one on a distance or heat sensor you could stop it working or go weird and a robot connected or car, could then screw up and kill you by not seeing you...

523  Using Arduino / General Electronics / Re: why do we need a resistor connected to the base of the transistor? on: February 03, 2014, 08:45:48 pm

I don't like op-amps... sure they are useful but I'll use transistors when possible, I use them mainly for comparitor circuits, checking voltage level (with a zener)

If you want current regulation a zener and a resistor/transistor would do nicely avoiding an op-amp

Did you honestly completely miss the point of my post? 

I have a habit of reading just the technical side and ignoring opinion.    And well to answer your question, helping people here esp when the person is new here, I think it is better to tell them what they need rather than spell it out for a thankless task, otherwise they wont learn and you'd have done the work for them!

I started out with your exact same opinion, but in the long term it's not helping them improve their skills at all, telling them to google bjt/fet/whatever at least gives them a starting point.
524  Using Arduino / General Electronics / Re: What is this? on: February 02, 2014, 06:16:25 pm
They are IC chips designed to petform a single task, what that task is depends on the IC.

It could be anything hence the google search.
525  Community / Bar Sport / A broken Arduino... on: February 02, 2014, 06:10:51 pm
What should a dead arduino board be called?

Deaduino? Or are you now a Boreduino? lol  yeah I'm majorly sleep deprived.
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