City lights is a fun project for kids of all ages to begin to learn a bit about soft circuits and an opportunity to create a fun at home project based either on your home city or one in your imagination. You will build simple block style buildings integrating LEDs for visual fun, there is a simple and a modular version so the sky is the limit with what you can create!

Step 1: Before We Begin

- 1 large Foam Core (for the building bases)
- 1 large artboard
- 10 LEDs various colors (one for each building so get as many as you want)
- 10 330 -ohm resistors (or as many LEDs as you get as you use one for each)
- 20 small Neodymium magnets (i reccomend these: https://www.kjmagnetics.com/proddetail.asp?prod=B441)
- 1 roll of copper tape (you will not use all of it)
-double sided tape
- hot glue gun or glue dots
- Sheets of tracing paper or vellum (for the buildings)
- 2 metallic sheets 26' guage or thinnner (you can even remove one from one of those little fridge magnet boards) 
- Soldering iron
-Scissors or exacto knife
- 2 9v batteries
-2 9v battery connectors 

(if you dont know how to solder yet check out this tutorial https://www.instructables.com/id/How-to-solder/)
kids of all ages should learn to solder and work responsibly, the earlier the better

all of these materials are available at your local art store or staples and radio shack, but i would recommend buying some of the electronics parts with special attention to the magnets online as the price differences are remarkable.
love it..very cozy
An exellent Instructible! I especially like the attention to detail in the layout of the power lines and how you are connecting them. One suggestion, if I may - I would suggest adding a bit more detail in the discussion concerning connecting the resistor to the LED. Why would the LED fry when 9v is applied? How do you know this? How do you know the resistor you've chosen is correct? <br> <br>These are very basic questions with very simple and direct answers, but they also could have deadly consequences in circuits rated differently for power. I would never assume your reader has the fundamental background in electronics to know the answer to these questions - especially with an 'able that will certainly inspire young larval makers to attempt ;-)
It is easy..white, green, and blue work with 3.0 volts DC..red and yellow use 2.0 volts DC..To find the resistor value, subtract the needed voltage from the beginning voltage and divide by .020..This is not exact but it works..Remember that the polarity must be right..A round LED has a flat on one side..This is negative(-) side..Hooking up reversed does no harm as long as the voltage drop is correct..It just will not light up..
Very cool! <br>One suggestion I would make is too put two LED's in, (one reversed).. This way the blocks would always light up, but depending on the LED's inside may even change color.. <br>
very nice instructable, brilliant idea...
nice job

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