Instructables

A really magic Harry Potter wand for Lumos and Reveal Your Secrets charms

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Further to my instructable for the '''Awesome Harry Potter Wand''', here is a more technical version. Still as beautiful to look at (more so if you have practiced on the simpler version) and yet this one actually performs magic (albeit science driven magic). A simple UV LED is used in line with a battery and a home made switch to make a wand that is able to illuminate otherwise invisible UV marker pen writing, and is bright enough to be a torch for the Lumos and Lumos Maxima charms.

Actually, it's very easy to make. If you have wanted to do something vaguely electronic, but the whole electronic thing frightens you, this is a good place to start. You will be building about the simplest circuit there is (a light, battery and switch), but the effect is incredible. This project provides a nice combination of craft and technical challenges with an equally interesting result.

If you thought the other wand was amazing wait till you have seen this, it'll blow you away.

For more great making and doing projects, free printables and templates of the highest quality please see my site dadcando.

And if you make one of these post up a picture of it, or better still email me and I'll put a picture of your wand up on dadcando.

Please Note: You should never point a bright light into someone's eyes. Apart from the fact that it is not very nice to be dazzled, bright LEDs and Bright UV LEDs can in certain circumstances cause damage to the retina (the back of the eye that does the seeing!) and the cornea (the bit the light goes through). When scavenging bits from another device, never increase the battery voltage or add other components designed to up-rate the output of LEDs or lights, unless you really know what you are doing, because you can easily break them, give your self a shock or create a fire hazard.

As Zootboy has pointed out, only use the batteries suggested in the instructable because they have the correct internal resistance. Using batteries with a lower internal resistance could cause the batteries to heat up or the LED to get hot and burn out.

However, this is not a problem at all if you use the batteries suggested.

Happy Making
 
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Bit late here -
I love the idea of putting the Maurauder's Map on via Inkjet UV ink and tweaking a wand for UV so it can be read.
I have been trying to find a luminous ink so that we can also write on the paper "Wormtail Padfoot and Moody greet the reader and request that they keep their abnormally large nose .... etc"
In this way, if the paper is read by another illuminated wand (normal LED) it would read the rude message a the LED would trigger the uminosity but if read by a UV wand it would read the Map

..... Ideas anyone?
Does the paperclip switch burn out?
How long does your LED last?
How do you know the specs on the LED light? I'm looking to purchase the components cheaply, but I want to match resistance, and not burn out the bulb. I can get the batteries and LEDs for significantly cheaper if I'm not buying a whole keyring at $.99 apiece. (I'm making several of these, and don't want to make the cost X10 because I'm spending a dollar per LED when I could spend pennies.)

Do you know what the viewing angle on the keyring light is? Do you know if the wand would get too hot if I put resistors in the circuit?
KaptinScarlet (author)  CatastropheJones2 years ago
In answer to your questions (as far as I know)

Q Does the paperclip switch burn out?
A. NO
Q How long does your LED last?
A. 100,000 hours is typical, way beyond what you will need
Q How do you know the specs on the LED light?
A. Look on the internet, there are plenty of websites that will give you the equation for determining the correct resistor to use for each LED and some LEDs have built in resistors. Each type of LED and each colour will have a specific forward voltage and thus require a different resistor value deepening on the power supply (battery) you are using.
Q Do you know what the viewing angle on the keyring light is?
A No, but look on the web, viewing angles of LEDs are pretty standard.
Q Do you know if the wand would get too hot if I put resistors in the circuit?
A. No, the LEDs must have a resistor in series with them to stop them burning out immediately.

Good luck
...checking back in, ages after the fact. Made a dozen of these for a Harry Potter themed birthday party. Didn't use resistors; used AA batteries in the wand shaft, and disguised the switches along the shafts in various places so the kids would get to find a wand that 'picked them' by trying to illuminate the word 'LUMOS' on a special poster (using UV bulbs and 'invisible' ink) while picking wands. They're still going strong, and by God they were the hit of the party and SO. MUCH. FUN.

My son even tried to make another one for a school "one word" project, where the word was 'light' and now he wants to invite friends over to make another set of them!

Best. Instructable. Ever.
Hugo41231 year ago
Probably gonna use the same electronic system for this on my custom sonic screwdriver :3
amy lee1 year ago
I do not have a soldering iron. Is there any replacement for soldering iron?
bandball1 year ago
Sweet! We want to make these at our library, what kind of wires do you use? Any resistors?
jawasan2 years ago
Thanks for the inspiration Kaptin! Here's mine....look for my instructable on it. :)
jawasan jawasan2 years ago
oh...here is a pic...
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atisseve2 years ago
Another easy way to make this wand, is to buy a 3mm UV LED from anywhere, and replace the bulb in the $24 illuminating harry potter wand that is sold.

Just saw off the very top of the wand, and the only about 1mm down on the 'wooden' part. Extract the LED and replace it with a UV bulb.
SusanR122 years ago
A little late to the party but I'm not too crafty so I bought a cheap plastic wand that came with a red LED and switched out the red for a UV. I also changed the button to a mercury tilt switch so it turns on when pointed down. I then replaced the black ink cartridge on my ink jet printer with UV ink made for fountain pens. I photocopied a map in black and white and it works great. Thanks for the idea.
KaptinScarlet (author)  SusanR122 years ago
Sounds amazing. When you say you're not too crafty... and then go on to say all the stuff you did, I wouldn't be too hard on yourself, sounds like you've done an amazing job. How did the inkjet thing work out? I would be worried about gumming up the inkjet printer or the fluid all leaking out. What was the quality of print like? And what make of printer ave you got?
manish152 years ago
And I thought this was magic. Great work by the way.
makendo4 years ago
 Fantastic project - many thanks for the instructable! 
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I love it !!!!!!
xxev753 years ago
this is awesome gj gj
where can i buy a uv led key-ring light
i already have a harry potter wand which doesn't light up
could i cut it near the end and put the light in and then glue/or tape(lots)it back together
i really want to make it for world book day
this is amazing
please can u subscribe to me then show me easier ways on how to make a
light up harry potter wand on my orange board :)
From the tip to the battery, there's a lot of empty space after rolling. Is there a remedy to this problem? I don't think hot glue will pass the battery to fill that area.
lmperkins3 years ago
I made a couple of these wands (excellent Instructable BTW) with a slight twist. I used the Joule thief circuit (described in another instructable, http://www.instructables.com/id/Make-a-Joule-Thief/) so I could use an inexpensive AAA battery. The larger battery with this circuit should give a very long lifetime for the wand. They came out quite nicely IMHO.
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AF-Geek4 years ago
Small, but wide, rubber/elastic bands work well to hold wires to batteries (or regular size, looped around several times). They keep pressure on the connection, so you don't have to worry about the tape pulling loose.
KaptinScarlet (author)  AF-Geek4 years ago
Brilliant idea, wish I'd thought of that.
wirecutter4 years ago
Brilliant a Wizard Instructable !
If you fit a changeover switch with a centre off you can have a white LED at the tip and two UV LEDs at the sides of the tip and if the leds are covered if a UV filter its effect really spooky as the LED's are invisible under the filter
twocvbloke5 years ago
I wonder if you can get UV ink for inkjet printers? :D Could make some interesting thing for revealing with a UV light... ;)
Hi
If you find it don't put it in a Epson type The Da... stuff kills the ink jet head
A better way is to get a couple of UV pens and dissolve the ink out with I.S.P.
and then use that in a washed out cartage.
Yea that would be awesome
You can get glow powder from glowinc.com Mix this with black ink ( quarter teaspoon with 5 ml of ink , Heat for 30 seconds in microwave stir throughly
refill black ink cartridge and print away... Be sure to 400 powder ,the granules will explode in the microwave(happened to me ) Don't know about uv ink but ask about it at the site they have everything else
I was thinking of transparent ink, like what you get in security pens, you print out seemingly blank documents, but under UV light, all is revealed... :D
KaptinScarlet (author)  twocvbloke5 years ago
Derrr, check out my comment below and the website I linked to, they already make it and sell it!
Oh yeah, I forgot about that.... :\
common mistake to read the top posts before the bottom ones ;)
My memory's useless, I forget things I've read, so I had read it, I just forgot I read it... :P
KaptinScarlet (author)  twocvbloke5 years ago
it has been postulated. The question is, could you hack a UV ink pen (or pens) and fill an inkjet ink reservoir to see if it works? My feeling is that in principle it sounds feasable, but in reality the viscosity and conductivity of the ink is crucial to the correct functioning of the inkjet, so unless you can buy UV ink formulated for ink jet machines then you have absolutely no chance. So why not try out these people (only pay using paypal though) http://www.fake-proof.com/printer_uv_ink.htm which I just found by searching on the web, seems to me that they have a solution of most common inkjet machines!... cool.
thanks for sharing this ,I have been looking but the best I could was with glow powder.. .I use the glow powder on my business cards and get a lot of comments ...... One person left it on his desk and the cleaning woman had a cow when she went in to clean and saw the glowing cad on the desk( wish I could have got that one on film........)
thepelton5 years ago
I solemnly swear that I am up to no good.
nebih thepelton4 years ago
mischief managed!
well thats good to know :o
gamer4445 years ago
does somebody know how to make a wand box, I can't find instructions anywhere!!!! (sorry if there are spelling mistakes but I am french so...)
Just shooting from the hip here... If you have a box, you could probably use that floral foam stuff and easily make an indentation for your wands in that, then glue either felt or velvet over it for that finished look.
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