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1  Using Arduino / LEDs and Multiplexing / Re: about led brightness on: February 03, 2013, 04:12:26 pm
thanks crossroads,
it was helpful..
2  Using Arduino / General Electronics / Re: can I power led strips with a 3.5mm phone connector? on: January 28, 2013, 05:27:04 pm
Just make sure it is inflammable.
are you serious?
3  Using Arduino / LEDs and Multiplexing / about led brightness on: January 28, 2013, 11:11:03 am
Hello!

I need to find white led strips that are quite bright , with a kelvin temperature around 4000k.
I am a bit lost between all those references.
Would you know where I can compare the color and brightess between smd 5050, smd 3020, smd 3528 or smd 3014 for instance?
Have you ever used one of them? could you tell me about their brightness?

thanks.
4  Using Arduino / General Electronics / Re: can I power led strips with a 3.5mm phone connector? on: January 28, 2013, 10:11:44 am
That all depends on :
a) length of cable
b) make-up of cable (number of strands of what cross section per core) or better still the resistance of the cable/metre
c) current drawn by the load

3.5mm are OK for low currents 10s rather than 100s of mA.  You might be able to push an amp or so through them but you could end up with contact problems = heat = even more contact problems.  Lots of gadget chargers use 3.5mm plugs as charge leads so they are capable of carrying current.

Have you thought about using RCA phono plugs/sockets.  These are much bulkier but they can carry a lot higher current than the 3.5mm jack.

Hello jackrae.

The 2.5m long strip will draw 1 A.
I will ideally need 4 meters of cable between he power source and the light.
Should I pick the classic electric cable used for any kind of lamp? (which has a 2x 0,75mm section.) or can I go for a thinner section?
The thinner is the better in my case (I need this cable to have a really soft sheath.)

thanks again.
5  Using Arduino / General Electronics / Re: can I power led strips with a 3.5mm phone connector? on: January 24, 2013, 01:35:00 pm
3.5mm phone connectors are OK for low voltage and low current.  However I would recommend you use the stereo (3 pole) rather than the mono type.  The mono type uses the socket body as one of the connection poles and this is unreliable since there is no "pressure" applied to this pole  -  it simply relies on touch contact.  I can state this from experience of using such connectors for a similar project.  If you use a stereo jack the outer two poles are connected by spring loaded contacts and therefore offer a much more reliable connection.

thanks for the advice jackrae.
Do you know the maximum cable length that I could use without altering voltage?
6  Using Arduino / General Electronics / Re: can I power led strips with a 3.5mm phone connector? on: January 24, 2013, 12:33:44 pm
thanks you.

Sorry, english is not my mother tongue.
I meant "that can be unplugged or plugged"
Hopefully, you understood what I meant.

What type of wire gauge should I pick?
7  Using Arduino / General Electronics / can I power led strips with a 3.5mm phone connector? on: January 24, 2013, 09:44:45 am
Hello.
quite a simple question,
I am looking for a elegant way to power an object that embeds led strips.
In order to move this object, I want the power cable to be unpluggable.
Can I put a female 3.5mm phone jack plug on my object and solder a male plug to the end of the power cable?
My strips specs are the following
0,4A/m /12 volt white color.
I will use 2.5 m of strip.
If jacks can't do the job, is there other nice cheap plugs I can use?
thanks
8  Using Arduino / LEDs and Multiplexing / Re: independant control on led chains. on: November 04, 2011, 08:46:22 pm
So you are looking for something like a string of say 255 LEDs, where each LED has its own address, you would connect all with common power, ground, serial-input, each would listen for its address and then act accordingly? Could have each buffer the input and pass it along to maintain signal integrity.
5 meter, 195 inches/500cm, you could have an LED/board about every 2 cm.
Send 2 byte message - 1st is address, 2nd is data telling it what to do.
Maybe have a couple addresses that are global commands.

This kind of thing
http://www.bliptronics.com/item.aspx?ItemID=88
but with white only?

yes that is the kind of thing I was looking for but in white to get a cheaper price

Quote

Maybe have each board have an LED, current limit resistor, 8-pin ATTiny85, and a single buffer chip.
http://www.ti.com/lit/ds/symlink/sn74lvc1g125.pdf
or make  your own with 2 NPN transistors (back to back inverters)


I'm afraid, this part is far beyond my actual skills.
would this custom solution be cheaper than pre made boards?
I can use a cnc to engrave pcb.

do you know any tutorial that could explain how to wire all this?
thanks for these precious informations, and sorry for my newbie-ness
9  Using Arduino / LEDs and Multiplexing / Re: independant control on led chains. on: November 03, 2011, 05:43:14 pm
Sorry, I missread (sorry for my english by the way)
I'm a bit lost in the vocabulary used for multiplexing tasks. most of the "how to's" I saw was about matrices
Can shift registers be 1 meters distant from each other?
10  Using Arduino / LEDs and Multiplexing / Re: independant control on led chains. on: November 03, 2011, 05:17:45 pm
Hello Mike.
I need a 5 meter long strip.
I thought It would be quite hard to arrange a matrix this way?
11  Using Arduino / LEDs and Multiplexing / independant control on led chains. on: November 03, 2011, 04:17:44 pm
Hello makers.
I need to create ribbons of white leds which could be independently driven.
I have read about addressable led strips but they are quite expensive for me and I don't need RGB colors.
I haven't found any "white-only" addressable strip.
Using shift registers does not really suits my project as I need real ribbons and no led grids.

Thus, I thought It may be possible to create little PCB  with a led and a chip ( like ones found on addressable strips) , that I could daisy chain?
I've just seen this video of an artist who seems to have build such little boards:
http://frey.co.nz/nowtheyknow
(The boards are shawn at 1'30" on the video.)

I'm a real beginner but with a great will to learn. So if you recognize the components used to build those boards, I would be glad to know more.
Thanks.
12  Using Arduino / General Electronics / Re: Solenoid valve and arduino protection on: January 28, 2011, 01:03:13 pm
what about this one?
http://www.sparkfun.com/products/9669
13  Using Arduino / General Electronics / Re: Solenoid valve and arduino protection on: January 28, 2011, 02:35:01 am
Ok thanks, If I can't find any controller board, I will do that.
I also thought that I could use a relay controller board? i've heard relay are making a bit of noise when triggered but it does not matter in my case.
Is it a reliable thing  (dealing with current feedback) to use such boards?
If anyone have advices about cheap a one....
Thanks, again and again... smiley
14  Using Arduino / General Electronics / Re: Solenoid valve and arduino protection on: January 27, 2011, 07:26:25 am
Thanks for your advices.
I did not precise that the solenoid that I can purchase at a cheap price are 24 V.
If I'm planing to use several dozen of items; is there some pre-soldered board that could make the wiring easier and would allow me to control several solenoid at once(like motor shield )
I've heard about some industrial protocol like modbus, profibus, or devicenet. some solenoid valve manifold have dedicated interfaces, but I don't know if I could use an arduino to do the serial communication...
thanks again.
15  Using Arduino / General Electronics / Solenoid valve and arduino protection on: January 26, 2011, 03:36:44 pm
Hello,
Being about to play with solenoid valve, I've ever found several information on this previous topic:
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1217238977.
I'm fairly new to electronic stuff, but read something about MOSFET transistor. Does this prevent from current feedback? replacing a diode?
Thanks for your experience.
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