Instructables

Multi Colour Runway Light

This instructable is a modified version of the various LED Sun Jar and Night Light instructables on this site. This is my first instructable posted and is really just a proof of concept at the moment. Revision plans have already started.

This particular version is switchable between 1, 2 or 3 lights. The parts list, as I made it, is as follows:

1 x Red 10mm clear LED ($0.90 AUD)
1 x Green 10mm clear LED ($2.70 AUD)
1 x Blue 10mm clear LED ($2.60 AUD)
1 x 180 ohm resistor ($0.38 AUD 8pack)
1 x 240 ohm resistor ($0.38 AUD 8pack)
1 x 150 ohm resistor ($0.38 AUD 8pack)
2 x diodes ($0.38 AUD 4pack)
1 x 9v battery ($5.65 AUD)
1 x 9v battery snap ($0.29 AUD)
1 x single pole sealed rotary switch (set to 4 position) ($2.95)
1 x Clear glass jar (I used an old coffee jar)
1 x Empty aluminium can
Broken glass (How much is needed will depend on the size of he jar)
0.12mm wire (To connect everything. USE A LIGHT INSULATION COLOUR)

Circuit diagram below is what I drew up after a brief discussion with the guys at work. (Thanks also to the guys at Jaycar for giving me a crash course in resistors)
 
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Step 1: Assemble the wiring

Due to unforeseen inebriation, the taking of pictures had been forgotten.

Assemble the components as per the wiring diagram below. Bear in mind that the LEDs will be inserted at different levels. So varying lengths of wire may be needed.

Initially I made all the lengths the same, which was the total height of the jar. so any every LED is the same distance away from the switch when held up. This allows for any LED to be at any level but causes some minor problems with the slack being pushed up into the lid.

Electorials3 years ago
it looks really nice!
Is it also possible to make one without any IC?
with transistors and diodes perhaps?
fr05ty9113 years ago
i did this except i used colour changing leds looks really cool.
Can someone explain to me how the calculations for the LED resistors to work?

I'm using...:

Red: 3.1v-3.8v, current is 20-30 mA
Blue: 3.1v-3.8v, current is 20-30 mA
Green: 2.8v-3.2v, current is 20-30 mA

Yes, i will be using a 9-volt akaline battery which has 565 mA-h (mA hour).
As Scromple stated or just use an online LED resistor calculator.
http://alan-parekh.com/led_resistor_calculator.html

Scromple (author)  brooklynlord4 years ago
brooklyn:  Okedoke... The math for calculating the resistors needed for a given LED and power source is as follows.

Resistance = (Voltage Supplied - LED Voltage) / LED Current

If you use a search engine and do a look up, I think there are some people that have actually written web pages that where you can just plug in the info and it spits out the resistor needed.

Also if you take a look at the circuit diagram, I put the formula on there.

Thanks
s
That should be.....

R = 5.5v / 25mA

R = 6v / 25 mA

Correct? but compared to the water flow theory this would be making the tube smaller for more resistance but with the same flow rate.....

Or is it okay?

Thanks
Also, when i'm activating 2 LEDs at the same time, should i put a lesser ohm resistor instead of 2 resistors?
Can someone tell me how to make one of these so it plugs into the wall?
You need an AC/DC power adaptor. Remember that LED's cannot run on AC, which is what comes out from your wall sockets. I'm sorry I don't know how resistors work, otherwise I'd tell you how many resistors you'll need.
Scromple (author)  Lt. Duct Tape6 years ago
Same circuit but with mains power instead of a 9v battery. Were you going to go directly into the mains socket in a house or do you have a power pack that will step the voltage down from mains to 12v???? Either way you would need to work out the resistors to use as the one I state above would not be correct. The formula to work out the resistors to use is in the comment for COMMODORE64 and in the instructable above.
(removed by author or community request)
Scromple (author)  DELETED_craz meanman5 years ago
Not really sure the number of hours exactly... I generally only use them when I have friends around. I can vouch for at least 6 hours. But that is not constantly on for 6 hours. I know that because of the 3 reasonably powerful LEDs the efficiency is not over the top. If you insert another resistor to drop the voltage that can be drawn from the battery you could make lights like this last quite a while on one 9v battery.
COMMODORE646 years ago
This is good, but problem, i would like to have some individual color, so that's mean few switches? If so, please tell me what to do about it, because i tried this on edison4, and i'm not satisfied with it.
I hope this helps, but i'm not EXACTLY sure about the resistors. Because I would like to provide a small modification on your project. Thanks :)
Untitled-1.jpg
Scromple (author)  COMMODORE646 years ago
The circuit you have there looks ok. As you said you need 3 individual switches and that would have control over each light.. Should be nice. A couple of suggestions on the switch types you could use<br/><br/>1 <a rel="nofollow" href="http://www.jaycar.com.au/productView.asp?ID=SS0821&CATID=28&keywords=&SPECIAL=&form=CAT&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID=575">Miniature slide switch</a><br/>2 <a rel="nofollow" href="http://www.jaycar.com.au/productView.asp?ID=SP0736&CATID=28&keywords=&SPECIAL=&form=CAT&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID=652">Bedlamp switch</a><br/>3 <a rel="nofollow" href="http://www.jaycar.com.au/productView.asp?ID=ST0335&CATID=28&keywords=&SPECIAL=&form=CAT&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID=448">Miniature toggle switch</a><br/><br/>Would depend on the amount of room you have to mount the switches.<br/><br/>With the resistors, the formula is as follows<br/><br/>resistance=((Voltage Supplied - Voltage of LED)/LED Current)*1000<br/><br/>So when you go to buy your LEDs take a calculator with you so you can work them out and get the correct resistors at the same time.<br/>
LinuxH4x0r6 years ago
I like it! Sort of like mine, but multicolored
Scromple (author)  LinuxH4x0r6 years ago
Yes it is quite similar.... I had not seen yours before, it's pretty cool. Never thought to use a light bulb.
Thanks! I think I'll make another one using a long florescent tube
Scromple (author)  LinuxH4x0r6 years ago
That would be awesome.... Mind the mercury though.
don't worry I'm not cutting it open. You'll see soon enough
Scromple (author) 6 years ago
Alrighty, I have made version 1.1.

Bought a specific glass jar with a metal lid. Located a bought a bunch of clear glass marbles from a $2.00 shop which makes everything a little safer.

Also used colour switching LEDs this time round that makes the whole thing appear a bit like a lava lamp.

Posted a video of this one...


Wow, this thing looks very cool, I think I'll make one of these. It will be a good idea to add this Instructable to one or more groups, then a lot more people would see it.
Now I've added it to some groups. I hope you like it.
Okedoke thanks... Will have to investigate.
I am building version 1.5 at the moment.. Same circuit but different LEDs. Groups??? There are groups. Pardon my ignorance. Been a member for wuite some time, but am really a noob on this site.
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