This design by Make Magazine’s Collin Cunningham uses a LED bar graph to display the meter’s reading, but as with all Arduino based projects, there are endless possibilities for modifications. This project replaces the LED bar with a LCD readout. Other possibilities include combining the EMF meter with a camera trigger to create a camera trap or you could build in an audio recorder that starts recording when a spike is detected creating an automated EVP setup. The only limit is your imagination.

Making the Arduino EMF detector @ Make: Online