EMF(Electromagnetic Field) Detector

This is a quick and easy instructable on how to make your own EMF Detector. You can use it to detect electromagnetic fields produced by your electronics. I like how the addition of the piezo buzzer makes it sound like a geiger counter for detecting radiation.

1. Arduino or other suitable microcontroller.

2. Antenna like this one.

3. 3 Mega Ohm resistor.

4. LED (You can use the on board LED if you would like)

5. Small Piezo Buzzer

6. Battery. I like cylindrical batteries like these but you can use a 9V Battery.

7. Wire

8. Soldering Iron and Solder

9. Screw for attaching antenna.

Simply connect the Piezo Buzzer and LED in parallel between ground and digital pin 11. It doesn't have to be pin 11, just a pin with pwm(pulse width modulation) capabilities. On most Arduino boards, pwm works on digital pins 3, 5, 6, 9, 10, and 11.

Wire a 3 Mega Ohm resistor between ground and analog pin 5 and your antenna to analog pin 5.

If you have an Arduino with solderable contacts for the pins, it is much easier to wire up.

Just upload the code to your Arduino and you're ready to go. This code is from another project found here. He just used a piece of wire and an LED. His project inspired me to make this instructable.

Thank you.