I have a medium sized Doll House under construction and would like to put programmable led into items and rooms. Programmable being colour, brightness and on/off.
I would want very small ones to 2mm (some come on a roll that can be removed) and am thinking perhaps of using some sort of a bus that could be used to hang these on , similar to how a house is wired for electricity.
I would be using a Nano for this project and would like to keep the pins and boards needed to a minimum, they would be hidden in the back of the detached garage - power might also be an issue but can be worked in.
Any thoughts would be appreciated. Thanks in advance
Hello
Maybe these LEDs : NeoPixel Addressable 1515 LEDs (1.5mm x 1.5mm) - 10 pack [SK6805-E-J] : ID 4492 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Good suggestion by @guix . Adafruit have a range of "Neopixel" LEDs which would be ideal for your purpose. They use a bus system that allows you to connect every light in the house with a single data wire in a chain leading back to a single Arduino pin.
But watch out for power consumption. Get a 5V supply with enough amps for all your LEDs on full brightness white and use that to power the Arduino throughout its 5V pin.
Actually, you are far better off purchasing these LED strips using the above LEDs and cutting LEDs off one (or many if it suits) at a time because they already include the required capacitor and it will actually be possible to solder to them. 
Thank you all - I will check them out - I was thinking that I would use Wire Glue to attach come of the led/wire - any thoughts..
You mean solder? Yes!
No I read about this item where you can use the conductive glue to wire items where heat may be a problem - have not bought or used it but was thinking about it.
Sounds like a marvellous idea!
Not!
So i guess I should save my money for more boards.
Boards?
Save your money for a soldering iron. For this work, you only need a low power iron. Or a temperature controlled iron, but they are much more expensive, so I suggest a cheap low power iron to begin and see how well you manage with that. Whatever type of iron you buy, you will need one with a very fine bit
(1.0mm or less) and fine solder wire (0.5mm). Depending on your eyesight, a large illuminated desktop magnifying glass would also useful. I guess if you make doll's house furniture and detailing, you might already have that.
I was referring to the conductive glue, not the project in general.
Not sure what you mean by "boards", either.
Just making a little 'joke' - I was referring to Ardunio boards.
I can do the soldering no-problem - hands are steady but eye's are -well not as good as they used to be.
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