How To: Really Cool Led Script for Arduino




About: I love working with electronics!!! I love working with electronics, laptops, and building things!!! I just started working with Arduino as of December 30, 2016

a kindof simple sketch I made fro leds with Arduino for s sick effect of the leds!

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Step 1: Hardware Needed:

1) Arduino uno R3

2) 12 light emitting diodes [leds and you can use more than 12 or less than 12 if you want]

you should have an even distribution of the leds: in this case 3 red, 3 blue, 3 green, and 3 yellow leds.

3) [4] 220 ohm resisters {band sequence- red,red,black}

4) 9 bread board jumper wires

5) Solderless bread board

6) the sketh that I will provide for you

Step 2: Put Leds and Resistors Accordingly

follow the picture

You should use different color LED's to make it look cool

Step 3: The Code [sketch]

here is a download link for the code above.

I forgot to change the name from to cool led lol


Make it Glow Contest 2016

Participated in the
Make it Glow Contest 2016

1 Person Made This Project!


  • Made with Math Contest

    Made with Math Contest
  • Multi-Discipline Contest

    Multi-Discipline Contest
  • Robotics Contest

    Robotics Contest

6 Discussions


1 year ago

I hate to sound real dumb.....but what does it do?? I am looking for something that would turn on random leds for a random length of time. Perhaps 12 to 20 leds in the group. I want to randomly light windows in the buildings on my Ho train layout. Like people entering and leaving rooms.


2 years ago

looks like an interesting little project however, your instructions are not that clear - especially the circuit ,,,,,

2 replies

Reply 2 years ago

sorry about that I will make better and clearer instructions in the future


Reply 2 years ago

also I updated the picture of the circuit with a diagram