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      <p style="margin-top: 3px; margin-bottom: 20px;">A while back I saw an EMF (Electromagnetic Field) Detector at makezine.com that used a led bargraph. I decided to modify it to use a 7-Segment LED Display! Here's my project. Sorry I don't have any pictures of it in use. Hopefully I can post some soon.&nbsp;<br /><br />Credit goes to&nbsp;<a href="http://www.aaronalai.com/emf-detector" rel="nofollow" style="color: #e86c00; word-break: break-all; overflow-wrap: break-word; cursor: pointer;" target="_blank">Aaron ALAI for the original project</a>. Also&nbsp;<a href="http://blog.makezine.com/archive/2009/05/making_the_arduino_emf_detector.html" rel="nofollow" style="color: #e86c00; word-break: break-all; overflow-wrap: break-word; cursor: pointer;" target="_blank">Conner Cunningham at Make: for doing a remake</a>.<br /><br /><em>Have fun, work hard, &amp; play nice! If you have questions please ask them!</em><br /><br /><br /><br type="_moz" /></p>
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   <h2 class="step-title" style="margin: 0px 0px 15px; font-family: inherit; line-height: normal; color: inherit; text-rendering: optimizelegibility; font-size: 24px; padding: 0px; text-align: center;">Step 1: The Stuff:</h2>
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      <p style="margin-top: 3px; margin-bottom: 20px;">The parts &amp; tools.<br /><br /><span style="font-weight: 700;">Parts:</span><br />-&nbsp;<a href="http://arduino.cc/" rel="nofollow" style="color: #e86c00; word-break: break-all; overflow-wrap: break-word; cursor: pointer;" target="_blank">Arduino</a><br />-&nbsp;<a href="http://www.radioshack.com/product/index.jsp?productId=2062557" rel="nofollow" style="color: #e86c00; word-break: break-all; overflow-wrap: break-word; cursor: pointer;" target="_blank">7-Segment LED Display</a><br />- 3.3M Resistor (Orange, Orange, Green)<br />- 470 ohm resistor (Yellow, Violet, Brown) or a similar value for the LED display<br />- Wire. I'm using 26 gauge wire<br />- Breadboard<br /><br /><span style="font-weight: 700;">Tools:</span><br />- Computer with&nbsp;<a href="http://arduino.cc/en/Guide/HomePage" rel="nofollow" style="color: #e86c00; word-break: break-all; overflow-wrap: break-word; cursor: pointer;" target="_blank">Arduino IDE</a><br />- USB A-B cable for Arduino<br />- Wire Strippers<br /></p>
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   <h2 class="step-title" style="margin: 0px 0px 15px; font-family: inherit; line-height: normal; color: inherit; text-rendering: optimizelegibility; font-size: 24px; padding: 0px; text-align: center;">Step 2: Wire the 7-Segment LED Display</h2>
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      <p style="margin-top: 3px; margin-bottom: 20px;">This is probably one of the most confusing parts of the project, so I'll try to be clear. But if I'm not please ask any questions you have.<br />I used pins 2-8 on my arduino for the display. I wired the pins on the display counter-clockwise starting at the upper-left corner. Hopefully the pictures help explain it better.<br /><br /><span style="font-weight: 700;">Picture 1)</span>&nbsp;Display before installation.<br /><span style="font-weight: 700;">Picture 2)</span>&nbsp;Display after installation.<br /><span style="font-weight: 700;">Picture 3)</span>&nbsp;Pin 1 on the display goes to pin 2 on the Arduino.<br /><span style="font-weight: 700;">Picture 4)</span>&nbsp;Pin 2 on the display goes to pin 3 on the Arduino.<br /><span style="font-weight: 700;">Picture 5)</span>&nbsp;Pin 4 on the display goes to pin 4 on the Arduino.<br /><span style="font-weight: 700;">Picture 6)</span>&nbsp;Pin 5 on the display goes to pin 5 on the Arduino.<br /><span style="font-weight: 700;">Picture 7)</span>&nbsp;Pin 6 on the display goes to pin 6 on the Arduino.<br /><span style="font-weight: 700;">Picture 8)</span>&nbsp;Pin 8 on the display goes through the 470 ohm resistor to the side rail on the bread board<br /><span style="font-weight: 700;">Picture 9)</span>&nbsp;Pin 9 on the display goes to pin 7 on the Arduino. Also Ground on the arduino is connected to the side rail on the arduino.<br /><span style="font-weight: 700;">Picture 10)</span>&nbsp;Pin 10 on the display goes to pin 8 on the Arduino.<br /><br />If you have any question please ask them!<br /></p>
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      <p style="margin-top: 3px; margin-bottom: 20px;"><span style="font-weight: 700;">Make the antenna/probe:</span><br />- Cut a 6-7 in. piece of solid core wire.<br />- Strip one end so you can plug it into your breadboard<br />- Strip the other end about 2 in. from the end.<br /><br /><span style="font-weight: 700;">Add the antenna:&nbsp;</span>(Pictures 2-6)<br />- Take the 3.3M ohm resistor and connect it from the ground on the arduino to a point on the breadboard<br />- Add another wire from where the resistor is connected to analog pin 5 on the arduino.<br />- Add the antenna to where the resistor and the wire are connected on the breadboard.<br /></p>
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<section id="step4" class="step" data-stepid="SWR2W91FV4LSABL" style="margin: 32px 0px; color: #333333; font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; font-size: 14px; background-color: #ffffff;">
   <h2 class="step-title" style="margin: 0px 0px 15px; font-family: inherit; line-height: normal; color: inherit; text-rendering: optimizelegibility; font-size: 24px; padding: 0px; text-align: center;">Step 4: The Code</h2>
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      <p style="margin-top: 3px; margin-bottom: 20px;">&nbsp;Here's some basic steps to program your arduino.<br /><br />1) Download the source code from below<br />2) Open the file in the&nbsp;<a href="http://arduino.cc/en/Main/Software" style="color: #e86c00; word-break: break-all; overflow-wrap: break-word; cursor: pointer;" target="_blank">Arduino IDE&nbsp;</a><br />3) Press the "Upload to I/O Board" button<br />4) Once the program is uploaded it will start running<br /><br />Hopefully there are enough comments in the code, but if you have any questions, please ask them.<br /><br /><em>There is no difference between the .pde file &amp; the .txt</em><br type="_moz" /></p>
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<section id="step5" class="step" data-stepid="SURRQJHFV4LSABP" style="margin: 32px 0px; color: #333333; font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; font-size: 14px; background-color: #ffffff;">
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      <p style="margin-top: 3px; margin-bottom: 20px;">Now go measure EMF's! Here's a few ideas:<br />- Your dog/cat<br />- You<br />- Computer<br />- Cell phone<br />- TV<br /><br /><span style="font-weight: 700;">Make sure to use common sense, I'm not responsible for any damage to you or your arduino!</span></p>
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