In this Instructable I will be showing you how to create a light reactive LED system. In this clip, I used a single color LED strip, but you you can use a single LED, multiple LEDs wired together, single color or RGB LED strip, it just depends on what you are trying to build. The set up is fairly simple, the component list is fairly basic so if you are a tinkerer you should already have the majority of the materials laying around. If not, I will post links to the components I used so you can order parts and get to work! 

In the following link you will see the entire setup. Obviously you may arrange it anyway you would like, I just kept everything close and compact for the sake of an easy video. 


Step 1: Components

For this project you will need the following:

1) LED  ~$20 (with shipping) 
- For this project I used a solid blue LED strip which I purchased on amazon. These 5 meter SMD 5050 strips can run around $70 in retail stores so I though I would be taking a chance purchasing something priced under $20, but I was not disappointed in the least. I'm sure there are better quality lights out there, but if you plan on cutting these up and have no real game plan you wont feel any guilt putting these through the ringer.

2) Mini breadboard  $5

3) Arduino Uno  $30

4) Solid core wire  $2.50
- For anything involving breadboarding, do yourself a favor and stay away from any stranded wire. It will just end up getting frayed and hard to manage. Solid core is the way to go. I also like to choose at least two different colors for my wire to keep grounds and powers visibly separate. It makes troubleshooting and wiring easier in the long run when dealing with a lot of components.

5) USB A to B cable  $4
- This will be used to upload your Arduino LED code to the Arduino Uno board

6) Wire cutter/stripper $5
7) Parallax Sound Impact Sensor $10

8) Wall Adapter Power Supply - 9VDC 650mA $6

Total cost will be a bout $80 but keep in mind, all of these components are completely reusable. You can recycle them into a multitude of projects in the future so try not to worry about the cost. Think of it as building up your technical tool box :)
<p>The LED strip has red and black wires coming out of both ends. I popped the one end into the breadboard like the simple single LED, but what do I do with the other end? </p>
<p>Other end doesn't need anything! It works now!</p>
<p>How to do this on Rasberry Pi2 </p>
<p>I want to use my pcs psu to power this. Would this need to be modified in any way to use a 12v supply? If so how?</p>
<p>I did a very simple test, and included the suggestions from JensC to reverse the lighting effect, and to keep them on a dim setting. to test, I just blew softly - the dogs wouldn't bark on command. This is a lovely Instructable - easy, but teaches some very nice basics.</p>
<p>I made a very basic version of this. I didn't buy an LED strip because I wanted to test it out first. My best recommendation is to not cut corners. The sound sensor is not the same one that is used in the instructions. I found it on Amazon for about 8 dollars (plus it had Prime shipping and I was being impatient). While it technically *works*, the decibel threshold is set much higher than I would like, even with the most sensitive setting. This meant that it would not pick up ambient sound easily and it would only work effectively if I placed the sensor directly next to my speaker.<br><br>Otherwise, great project, especially if you're new to arduino. One thing I did was swap the LED brightness values (the analogWrite(LEDstrip, 255) portion of the code). As the author previously mentioned, 255 means &quot;off&quot; and 0 means &quot;on&quot;. I wanted the lights to pulse when the sensor sent 1, so I had the &quot;if&quot; statement write 0 and the &quot;else&quot; statement write 255. I also lowered the &quot;off&quot; value to 250 so that the bulbs are always a bit dim, even if no music is playing.<br><br>Another thing you can play around with is the delay() value. This essentially will tell the bulb how many milliseconds it should remain off (or on depending on how you set the analogWrite() values). I lowered mine from 10 to 2 and noticed a very slight improvement on how it reacts to the music, however, 10 will probably be ideal in most cases.</p><p>Very cool project and great idea for parties! I will definitely have to pick up the better sensor and the LED light strip. I have a beer pong table that I would love to mount this under :-)</p>
<p>excellent observations, very helpful to aid in launching off from the basics.</p>
<p>Hi, I have a 12V LED strip and it has the two wires (positive/negative) however the LED will not light up when it is all powered up (as the arduino won't output that much power I believe) Can someone tell me what I need to do to fix this? everything else works perfectly. Many thanks.</p>
<p>I used a RGB strip and needed transistors as well.</p><p>The code is</p><p>//hyperhitesh.hol.es</p><p>#define LEDstrip 6</p><p>#define LED2 5</p><p>void setup()</p><p>{</p><p> pinMode(8,INPUT);</p><p> pinMode(LEDstrip, OUTPUT);</p><p> pinMode(LED2, OUTPUT);</p><p>}</p><p>//this function will make the LED dim once the Parallax Sound Impact Sensor sends a 1 signal, and then return to it&rsquo;s original brightness.</p><p>void loop()</p><p>{</p><p> boolean soundstate = digitalRead(8);</p><p> if (soundstate == 1) {</p><p> digitalWrite(LEDstrip, HIGH);</p><p> digitalWrite(LED2, LOW);</p><p> delay(100);</p><p> }</p><p> else{</p><p> digitalWrite(LEDstrip, LOW);</p><p> digitalWrite(LED2, HIGH);</p><p> delay(100);</p><p> }</p><p>}</p><p>LEDstrip is green</p><p>LED2 is blue. Just used 2 colours.</p>
<p>What should the code look like if I am using a 5V arduino microphone (http://www.amazon.com/Adafruit-Electret-Microphone-Amplifier-Adjustable/dp/B00K9M6S1O?ie=UTF8&amp;psc=1&amp;redirect=true&amp;ref_=oh_aui_detailpage_o03_s00) instead of a parallax sound impact sensor?</p>
<p>Hello sir, I am a student who's attempting to make your project here, in school, and i would like to know what cables did u use to connect the sensor to the arduino, was it female/male right?</p><p>If you have a more explainned video that you could send me i would appreciate it alot! </p><p>Thank you, Jo&atilde;o.</p>
<p>I love this! Do you know how one would connect the LED wireless. Ideally I wuold like to control something like this from my Phillips Hue controller. </p>
i have a sensor that has 4 pins, GND, +VE, AI , DI<br>and has a completely different pot <br>the problem now arises is that im unable to use it after a couple of runs :(<br><br>this was my first arduino project. perhaps arduino is not for me :'(
<p>Can I use any of the cheap ebay sound sensors in the same way?</p>
<p>As long as it has power, ground, and a signal/output pin, it should work. Be wary though... the same thought went through my head and I found one for 8 bucks on amazon (http://www.amazon.com/gp/product/B00AF2GB1U?psc=1&amp;redirect=true&amp;ref_=oh_aui_detailpage_o00_s00) and, while it works, it only is effective for extremely loud noises. I basically had to put the sensor right next to my speaker in order for it to work effectively. I would recommend just getting the sensor that is in the description and not cut corners.</p>
<p>what if i use an audio input jack instead of the sensor? will the circuit work?</p>
<p>did it work?how do you connect the jack to the circuit?simply replace the sensor with it?i need to do this because i cant find the sensor anywhere</p>
Say I wanted to use this set of RGB LED strip <br>http://pages.ebay.com/link/?nav=item.view&amp;alt=web&amp;id=291120524106 <br><br>How would I set everything up?
<p>like this probably :)</p>
<p>and the code:<br>//abbas-akhtar</p><p>#define REDPIN 5 </p><p>#define GREENPIN 6</p><p>#define BLUEPIN 3</p><p>int redNow;</p><p>int blueNow;</p><p>int greenNow;</p><p>int redNew;</p><p>int blueNew;</p><p>int greenNew;</p><p>void setup()</p><p>{</p><p> pinMode(7,INPUT); //SIG of the Parallax Sound Impact Sensor connected to Digital Pin 7</p><p> pinMode(REDPIN, OUTPUT);</p><p> pinMode(GREENPIN, OUTPUT);</p><p> pinMode(BLUEPIN, OUTPUT);</p><p> redNow = random(255);</p><p> blueNow = random(255);</p><p> greenNow = random(255);</p><p> redNew = redNow;</p><p> blueNew = blueNow;</p><p> greenNew = greenNow;</p><p>}</p><p>#define fade(x,y) if (x&gt;y) x--; else if (x&lt;y) x++;</p><p>void loop()</p><p>{</p><p> boolean soundstate = digitalRead(7);</p><p> if (soundstate == 1) {</p><p> analogWrite(BLUEPIN, blueNow);</p><p> analogWrite(REDPIN, redNow);</p><p> analogWrite(GREENPIN, greenNow);</p><p> redNew = random(255);</p><p> blueNew = random(255);</p><p> greenNew = random(255);</p><p> // fade to new colors</p><p> while ((redNow != redNew) ||</p><p> (blueNow != blueNew) ||</p><p> (greenNow != greenNew))</p><p> {</p><p> fade(redNow,redNew)</p><p> fade(blueNow,blueNew)</p><p> fade(greenNow,greenNew)</p><p> analogWrite(BLUEPIN, blueNow);</p><p> analogWrite(REDPIN, redNow);</p><p> analogWrite(GREENPIN, greenNow);</p><p> delay(1);</p><p> }</p><p> }</p><p> else{</p><p> digitalWrite(REDPIN,0);</p><p> digitalWrite(GREENPIN,0);</p><p> digitalWrite(BLUEPIN,0);</p><p> }</p><p>}</p>
<p>If I know there should be resistors....</p>
<p>Sorry, I mean Transistors.</p>
<p>like this?</p>
<p>Hello,<br>Great tutorial.<br>I am trying to make it, but my led strip won't go on. Everything is hooked up right, but the led strip doesn't light up.<br>What could be the problem? I hope that anyone can help me out.</p>
<p>is the voltage right? plus double check everything and try to do exactly as it is in the steps if its your first time.</p>
<p>This is an awesome project. Could this work with guitar amplifiers? They can be quite loud. Would this over load the mic and cause problems, or is it just a matter of adjusting the arduino in the code?</p>
<p>I'd say it would work with a guitar amp. You would just adjust the dial on the sound sensor to be less sensitive. The arduino code doesn't have anything to do with the sensitivity of the sensor. As for your other question, you use the breadboard to connect different pieces of electronics. It isn't necessary if you want to solder everything together, but it simplifies things and makes it very easy to change things around.</p>
<p>Also, how does the breadboard come into use in this design? I'm not sure I understand why you'd use it</p>
great i'ble for hsing arduino and LED strips
<p>would this component work on this project? http://www.banggood.com/Sound-Sensor-Detection-Module-LM393-Chip-Electret-Microphone-p-929245.html</p>
<p>As long as you're passing a high signal to the same input on the board it should turn on. (You could make it a constant high to keep the lights on, or light LEDs with motion/distance/light)</p>
<p>Would a fairly loud bass system interfere with the sound response?</p>
How do you use multiple LED strips (somewhat new to Arduino)?<br><br>Thanks in advance.
<p>is it possible to use a battery for the power supply as id like to take this outside to test it and record it on video for a uni project??</p>
<p>Is there any way to do this with an audio input jack like for mp3 players instead of a sound impact sensor, so that you can cut out possible back ground noise.</p>
<p>I've also wondered how to do that... So I'm gonna do some research and if I design a functioning circuit I'll post it on here :)</p>
<p>Any luck, MrLucass? :)</p>
<p>This 9 STEP is easy to do</p>
<p>Does this project use the breadboard at all? It's not included in the schematic.</p>
<p>It does, I just made an assumption people knew how to wire the breadboard with my description. I can make another schematic with the intermediate bread board connections though!</p>
<p>I understand how the breadboard works, and I'm assuming that the arduino's ground and vin connect to the breadboard, and the LED connects to the breadboard as well, taking the arduino's vin. Is this correct?</p>
<p>You got it :)</p>
<p>Hello GraziCNU, I am new to the entire breadboard idea and would like to ask if you could post the schematics for the breadboard connecting to the arduino and sound sensor. If you could message me or reply to the comment, it would be greatly appreciated!</p>
<p>Hey GraziCNU, I know this schematic was a while ago but is it possible you can post a bread board schematic. I am new to this and want to add to the setting of my bedroom. The wiring schematics already posted are just a bit confusing and i cant discern where to put the wires in the bread board alone from the video. Any help would be great!</p>
<p>Hi, this instructable has been so much more informative than every other one I've tried, but what if I was to use an RGB LED strip? I saw your code in a previous comment but what about wiring? It has 4 leads instead of one, and it seems that one is for power and the others are for Red, Green and Blue, although I don't know what exactly that means in terms of power and voltage.</p>
<p>How do I create this using wifi or Bluetooth connector, instead of a sound impact sensor? </p>
<p>Super cool tutorial and application! My one question is how do you specify the voltage going to the LED? Is that programmable in the Arduino as well? I wouldn't want to rig all this up and then fry my LEDs (I want to use high powered ones) . </p>
<p>Can you advise on which pins to connect extra leds to as at the moment I am just using singal leds</p>
<p>I have reread this post about 2 weeks trying to find out why the Sound impact sensor will go with the music but the LED strip will stay on. I would love someones input on this thank you </p>
<p>Hey! I have 12V 2A LEDs you said power supply should go in Arduino (There where comes the battery) but wouldn't that burn the Arduino?</p>

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