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16  Forum 2005-2010 (read only) / Interfacing / Re: PWM Lighting (with incandescent globes) on: August 07, 2009, 04:25:25 pm
oh, don't worry about the colours, that'll be an illusion from dying the paper, I just want white inside the lanterns smiley

Thanks so much for that link, I think I might go down the path of a few of the 50 packs (I can always hook up a few more in each lantern if they're not bright enough, hey)
17  Forum 2005-2010 (read only) / Interfacing / PWM Lighting (with incandescent globes) on: August 06, 2009, 07:16:05 pm
G'Day Guys,

I'm trying to figure out what I need for this project.  We're creating an artwork that requires 12 'lanterns', this project will be an artwork that has close relations to colour and music.  As different signals are sent through a MIDI interface, the lanterns will light up, one lantern for each note.  I can do all the midi stuff through the computer and just send what lantern needs to be light up and at what intensity via processing on the computer and send it across the serial to the Arduino, that's no problem, what is, is the lighting.

Our test lantern has about 5 white LED's in it, the plan is to die the thin paper different colours for each of our lanterns, the problem is cost (and I'm pretty bad at electronics).  White LED's cost about $1.10 each so putting 5 white LED's in each lantern, and having 12 lanterns... it adds up pretty quickly.

I don't know how bright they'd be in comparison, but 2.5V Krypton Torch Globe is only $1.75 each, and I might be able to get away with just one in each lantern??.

My power supply is currently a 5V 2A regulated supply and I'm not sure this would be enough, I also have no idea how I'd use this +5V supply to power a 2.5V lamp?? let alone PWM them (would I need a series of MOSFETs?)

Any help would be much appreciated. Thanks,

18  Forum 2005-2010 (read only) / Interfacing / Re: Broad home automation via email question on: August 06, 2009, 07:18:14 pm
could use an Ethernet module to get your Arduino on check e-mails for you (using POP or IMAP or something)... HARD

or you could hook it up via serial to your computer and write a python script (or similar) to use IMAP-PUSH or poll an e-mail provider to check for commands, that should be pretty easy smiley (then you'd just need to send them to your Arduino via serial)
19  Forum 2005-2010 (read only) / Interfacing / Re: Pain in the butt LCD on: December 04, 2008, 05:09:32 am
could not get it working cheater... smiley-sad  are you *sure* that it works just like that?
20  Forum 2005-2010 (read only) / Interfacing / Re: Controlling mains with Arduino on: June 07, 2008, 08:09:30 pm
yeah, by powerpoint I was referring to the "Wall outlet".  I still don't see why those sort of relays are so big an expensive, I might end up just trying to build a little gizmo that can turn on the switch of the wall outlet instead of playing with electricity directly then smiley
21  Forum 2005-2010 (read only) / Interfacing / Re: Controlling mains with Arduino on: June 07, 2008, 07:46:44 pm
This device is a relay smiley When talking about electricity, you _always_ need to check how much current the power lines and circuit can handle. People forgetting to do this and making heavy plugging cause fires every year.

Enough for the "moralist" part. It's very easy on any electronics part supplier's catalogue to find 1. The power a relay can handle, and 2. the power it needs to switch the circuit on. If you don't know how to search, just go to a physical shop and ask a vendor, knowing your heater's power consumption and just double-check what s/he will suggest you to buy. On some models you may need to use a transistor to power up the relay, but don't worry, this is really easy to do.

Has a powerpoint got a max-Watt rating it can handle?  Why can't they just make relays that can do whatever the powerpoint can do? (just something to replace the physical on/off switch on the powerpoint)
22  Forum 2005-2010 (read only) / Interfacing / Re: Controlling mains with Arduino on: June 07, 2008, 07:18:02 pm
Hmm, powering a heater, not such a good idea, that first device posted apparently can do 7 amps at 240 Volts.  That'd be 1,680 Watts, right?  Well, my little heater is at 2,400 Watts.  Can't they make a device that just physically switches on the circuit (like, sent a current to turn the switch on, another one to turn the switch off) so it'd be like turning on and off a main powerpoint without having to worry about how much load the relay can handle?
23  Forum 2005-2010 (read only) / Interfacing / Re: Controlling mains with Arduino on: June 07, 2008, 05:13:47 am
I don't see how this can plug into the power point.  I don't really want to have to re-wire the powerpoint live (as I don't have access to switch the mains off)
I wired the relay module to a mains plug and mains socket:

Very cool, so I could follow your diagrams and hook that little component from DX to, say a small extension cord?
24  Forum 2005-2010 (read only) / Interfacing / Re: Controlling mains with Arduino on: June 06, 2008, 06:34:27 pm
That's very cool, looking at the gizmo that I'm supposed to hook the heater up to though, I don't see how this can plug into the power point.  I don't really want to have to re-wire the powerpoint live (as I don't have access to switch the mains off) but this is exactly what I'm looking for thanks guys smiley
25  Forum 2005-2010 (read only) / Interfacing / Controlling mains with Arduino on: June 06, 2008, 04:22:33 am
G'day gang,

I've got a feeling (and doing some searches kind of makes me agree) that this questions gets asked about once a week.  How would I go about making something to turn on and off things that I can plug into the mains with the arduino?  The reason I'm starting a new thread is because if there exists something a pre-made (but not as expensive and as fancy as X10) that could do it, it'd be great.  I'm a pretty much electronics newb, so I don't want to electrocute myself or anything of that nature.  The idea is that I would just like to be able to turn the heater in my room on and off (with say my (hopefully soon to have) iPhone) from around campus.  Even something like a little motor doo dad that would physically switch the powerpoint on would be good enough for my purposes (then I wouldn't have to worry about the kind of electricity this heater would chew up)


26  Forum 2005-2010 (read only) / Exhibition / Re: Midi Keyboard Artwork on: December 31, 2009, 08:15:43 am
Unfortunantly not smiley-sad. Like I said in my blog post, the videos didn't really turn out.  Having the room pitch black except for when a note was played kind of confused the camera I think.  If we ever get to exhibit it at a gallery I'll be sure to get some footage then.. Ps if anyone knows of a curator who's interested in the Sydney area pleease let us know smiley-wink
27  Forum 2005-2010 (read only) / Exhibition / Midi Keyboard Artwork on: December 31, 2009, 07:09:38 am
I've been helping a friend with her media arts artwork this year.  The idea was that each musical note could be associated with a colour.  For her artwork, she hung 48 lanterns around a room and had a midi keyboard on display.  As you started to play the keyboard, each light (4 light per note) would light up.  There were 3 ultra bright LED's and a resistor wrapped in different shades of cellophane to produce the different colours.  Playing different combinations of notes would allow different light combinations, the harder you hit the notes, the brighter the colours.  The colours would fade with the sound.

You can see a blog post about it here:

28  Forum 2005-2010 (read only) / Exhibition / Re: "Netduino" shield prototype photo on: January 26, 2008, 02:42:22 am
Yay!  Great to see it in front of my eyes!  Brilliant!
29  Forum 2005-2010 (read only) / News / Re: Library writing tutorial. on: November 09, 2007, 04:50:02 am
Hey guys.

This is really the first time I've been poking around the forums (when I should be studying for an exam tomorrow) and usually hang out more on the Arduino IRC channel (I'm Hyphenex.)

I'm a complete newbie when it comes to electronics.  Computing, not so much, so this tutorial is perfect for me in describing the basics!  Exactly what I need (ok, maybe not what side of the USB cable to plug into the computer, and the arduino) but I can tell you were just being funny there smiley

Once again, Great!  I have to thank you a lot smiley

This is making me excited about the prospect of getting an arduino in a few weeks (and maybe convincing one of my old school teachers I still keep in contact to get a few for his electronics class)

Very well done with these tutorials once again.  Thanks smiley

30  Forum 2005-2010 (read only) / Bar Sport / Re: Ideas for an honours thesis anyone? on: March 01, 2010, 08:50:57 pm
So how old are you, how much compsci background do you already have, what is the class supposed to include, what is the teacher's background (especially WRT microcontrollers as opposed to desktop programming), and is this supposed to be more of a "thesis" or a "project" ?

"Interfacing Real World Sensors to <desktop programming language> using Arduino" seems like a pretty catch-all title that might work well and give you a broad space to explore in more or less detail as time and interest dictate...

I've graduated from Comp Sci with a distinction average smiley and am 21 years old.  It's supposed to be more of a thesis then a project, (ie. a project can be built to prove the theories in your thesis, but it's the piece of paper in the end that counts.)

I like the idea of a "Interfacing real world sensors to <desktop programming language> using Arduino", but feel it'd be more of a project then it would research.  My supervisor, although specializes in 3D graphics did the equivalent of a double degree in Comp Sci and Electrical engineering so is pretty able to help give advice and direction (once the idea is there anyway smiley-razz)
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