Introduction: EMF(Electromagnetic Field) Detector

About: Electromechanical Engineer, Product Designer, Maker. I love to make prototypes and teach others in the process. I graduated from UCF and spent two years working at NASA.

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.

Step 1: Things You Will Need

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.

Step 2: Wire It Up

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.

Step 3: Upload the Code

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.

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