A Really Magic Harry Potter Wand for Lumos and Reveal Your Secrets Charms





Introduction: A Really Magic Harry Potter Wand for Lumos and Reveal Your Secrets Charms

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

Step 1: Get a Cheap UV Marker and Key Ring LED Set

you can get these off the web, or from Amazon. I have searched for them and there are some links on the Magical Wands page of dadcando for the cheapest I could find, but most big office stationers or art shops should stock them.

Step 2: Take Apart LED Keyring

take the LED key ring light apart. take care to see which of the LEDs legs is touching the positive battery terminal, in this case it was the short one. If the leg is bent like this one is, it might need straightening out to fit inside a drinking straw (you'll see why on a few steps).

The batteries which come with most keyring lights are these CR2016 (that's 20mm diameter and 1.6mm thickness BTW). I felt that the diameter of 20mm was too much for a wand handle so i looked around for a narrower 6 volt battery. The best i found was the 6V camera battery 4LR44. As all our joins to the battery are going to be by taping the wires on the less batteries we have to join together the better, so a single battery for the whole 6v is what you want.

Step 3: Solder Wire to the LED

Basically the electronics part of this project involves soldering a couple of flying leads onto the LED and positioning the battery and switch at a slight distance from it, not exactly rocket science, but tough if you don't happen to have a soldering iron. BUT seeing as you can probably buy one for less than the value of the wand you are about to make, maybe now is the time to get one.

To make it easier to solder, push the LED upside down into a piece of plastercine, blu-tack, corrugated or foam core cardboard. That way it is held steady while you concentrate on the soldering.

To get a goo solder join, tin the wire first (to tin the wire, hold the soldering iron on the wire and touch the solder on to the wire as well, when the wire is hot enough, the solder will melt and run along the strands of wire solidifying them together.)

Handle the soldering iron with extreme care as they get very hot and will burn you easily and badly, and will make holes in tables and carpets if knocked off their stands when hot. Also never pick a soldering iron up by the metal bit, you just don't know if it is still hot or not... always use the handle.

Step 4: Thread Wires Through Drinking Straw

you might have to file the flange of the LED to get it to fit in the drinking straw. Just before you slide the LED in put a small blob of glue gun glue in the end of the straw to hold the LED in place.

You can put a blob of glue at the other end too just to make sure that it is all nice and secure.

Step 5: Prepare Your Batteries

We are going to be sticking the wire on the end of the battery using tape to hold it in place. As this is a rather rough and ready (although perfectly ok) way of attaching a wire to a battery, it is a good idea to insulate the rest of the battery to make sure that the wire doesn't slip and short across to the metal casing of the battery.

I cut a hole in a piece of sticky tape using a hold punch (punch sticky side up) which makes a hole in the tape that is a perfect fit for the battery terminal.

Step 6: Insulate Both Ends of the Battery

But remember to mark which end is positive and which is negative, using permanent marker or two different colours of insulating tape.

Step 7: Attach the Wires to the Battery

It is quite tricky to solder straight onto a battery terminal, and quite easy to damage the battery when doing so, but it is ok (for this application) to press the wires against the battery. So coil up a bit of the bared end of the wire and place over the bare battery terminal and hold in place firmly with sticky tape pulled hard over the top of it.

Step 8: Connect Both Wires and Strap to Battery Sides

make sure that the positive battery terminal is wired to the positive leg of the LED and that the negative terminal is wired to one half of the switch and that the negative leg of the LED is wired to the other half of the switch.

I have taken each wire from the battery and doubled it back over the battery and strapped it to the battery side with even more tape. This doubling back is to make sure that that it is not easy to pull the wires directly off the battery terminals

Step 9: Now Start to Make the Wand Outer Itself

Much like the Awesome Harry Potter wand you are going to roll up a piece of paper (I strongly recommend paper due to the size and thickness of the battery).

This is not going to be that easy. You must roll to get a taper, so that the big end is tight round the battery and the little end is as tight as possible round the straw without it all wrinkling up.

Start by folding the corner over and start by rolling it round the wires, as shown in the picture.

I really helps to have a couple of strips of double sided to help keep things in place while the glue is setting. DO NOT out too much glue on, it takes ages to dry and is not needed.

Try and aim to get the end of the straw lined up with the end of the paper. You don't have to get it to line up exactly, becuase we are going to be adding another bit of paper when we have done this anyway.

Be careful of the wires don't let them be twisted too much nor strain against the contacts.

Step 10: The End Will Protrude

better that it pokes out that is to far in.

Step 11: Roll Up the End With a New Piece of Paper

using a strip of double sided to hold it in place, cut out and then roll up a corner of paper so that the tip of the wand is covered right down to the LED

Step 12: Trim Larger End

being very careful not to cut the wires, trim the larger end straight. the thin end will already be nicely wrapped and straight so will not need trimming.


To make the switch, take two little paper clips and gently bend them out before re-bending them into the shapes shown. The little end bits are for soldering to and these should be roughed up a bit with sandpaper or an emery board.

To make the hoop, bend the wore round a stick or handle of the same diameter as the larger end of the wand.

Step 14: Solder on the Wires

Solder the wires to the solder tabs. for each solder tab, cut a small vee shaped hole in the top of the large end rim. When you have soldered the wire on to the solder tab of the paper clip, rest the paper clip down into the vee shaped cut out and secure with a small blob of glue gun glue, do the same for both paper clip parts, making sure that they don't touch at the top.

Step 15: Set the Switch Gap

put a small blob of glue gun glue under the top of the straight paper clip and while it is still hot hold it so that it is spaced off the hoop of the other clip so that there is a 1mm to 2mm gap. Let the glue set. now you can try your switch.

Now you are nearly ready to decorate your wand. But first you must fill the end with glue gun glue.

Step 16: Fill the End of the Wand

The big end of the wand will be at least the same diameter as the 4LR44 battery, so it will take some filling. Remember glue gun glue is very hot so filling it up all in one go would be dangerous, use up loads of glue and take ages to set.

I suggest that you roll a small bit of tissue into a small ball and pack the wand a little first. then fill the end in tow or three stages, making sure it has cooled a bit in between each filling. This should only take you about 10 minutes.

For the last bit make sure that the end bulges slightly so that you get a nice rounded finish.

If you go over the metal of the switch it might heat up the previous glue you did there and the switch might relax its position and touch the other contact. This is not a problem, just be aware that you might have to support the switch while the glue sets again. You could put a scrap of card between the switch contacts to stop them touching while the glue is setting.

Step 17: Add Surface Features With the Glue Gun

use the glue gun to add surface detail to the wand. Rotate the wand while applying the glue. You can see from the pictures here and on the Awesome Wands instructable, that everyone does this differently.

HOWEVER, it is a good idea to hide up the switch part so that no one will guess the more muggle working of your magical device. As they are only thin little paper clip wires it is quite easy to glue gun over them as part of the design.

In the second picture here you can see how I have gone over the metal clip and even carefully gone past the end of the metal so that the glue gun glue (plastic) joins back onto the wand.

NOTE: This is the finished wand with all the distressing (and some black shoe polish) done to it.

Step 18: Paint and Distress Your Wand

These steps have been more or less covered in greater detail in the HP Awesome Wands instructable and in the Wizardry & Magic section of dadcando, but I have put a brief description here. You have to mind you don't paint over the switch contacts and the LED.

1) Seal the wand with spray paint or emulsion (must be something that sets or dries water proof).

2) paint with wood colour or colour of your choice

3) paint with black mixed with a little water and wipe off as you go so that paint stays in the cracks and corners

4) detail with gold paste, gold paint, gold or silver marker pen or gold or silver leaf

Don't worry if you get a little bit of paint on the switch contacts and they stop working, all you have to do is carefully scratch off the paint to reveal the metal at the point where they touch.

HOWEVER take care not to spray the LED, the best way to do this is to wrap a scrap of tape round the end when you are spraying so that it stays unpainted.

Step 19: Finally Your Working Wand

I finally finished my wand by covering it in show polish and burnishing it up with a soft brush and a duster and then touched in the odd bit of gold over the top for full effect.

Now when you want to use the wand, remember to Swish and Flick and while holding it feel how you can press the switch without anyone noticing and say Lumos, or if it is dark say Lumos Maxima, very good, now then you are ready for the much harder charm, "Reveal your Secrets".

Experienced wizards know that for this to work, they first have to get a UV security Marker and draw or write a design that they will later want to reveal. You have a marker from the set you bought, so get drawing. Draw a marauder's Map, put the feet on it and then you can follow them round with the wand, but until you use your magic on the page no one will be able to see it.

NOW how cool is that?

To draw a Marauder's Ma I recommend drawing it in normal pen first and putting that under the page so that you have something to trace over with the UV pen, because it is very hard to draw or write things when you can't see what you are doing.

I am going to design a marauder;s map and put it up on dadcandoas soon as I can so that all you magical wizards and witches can really have some fun.



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WONDERFUL instructions. We were able to tape two AA batteries (one on top of the other) to get the correct voltage. The connection wasn't "tight" but a squeeze of the wand and the connection is made and we have light! As a note, my local hobby shop was able to help me with the soldering (I'd never done it) for a tiny fee ($5)! The gentlemen had a great time getting my wand working and my 8 yo is THRILLED! Thank you!

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?

That is a really cool idea

I haven't got a soldering iron (nor any skills in soldering) what could I do instead??? Please answer as this looks awesome.

couldd you make a video on how to make this the inturctions didnt make sense

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?

In answer to your questions (as far as I know)

Q Does the paperclip switch burn out?
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.

Probably gonna use the same electronic system for this on my custom sonic screwdriver :3