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.
Parts: - Arduino - 7-Segment LED Display - 3.3M Resistor (Orange, Orange, Green) - 470 ohm resistor (Yellow, Violet, Brown) or a similar value for the LED display - Wire. I'm using 26 gauge wire - Breadboard
Tools: - Computer with Arduino IDE - USB A-B cable for Arduino - Wire Strippers