Credit Card Sized Metal Detector

Hello everyone I want to show you my last project, a Credit Card Sized Metal Detector.

This is a Pocket and flat version of the original instructable:

https://www.instructables.com/id/Simple-Arduino-Me...

Step 1: Previous Versions

I was happy with a previous version that I build, it was working very well, but the huge coil was giving it a Ghostbuster look. so I started wondering how to shrink it.

First I tried with a smaller coil, it worked better and was more compact, but I was still not happy.

So I went for the flat version and the coil was the biggest challenge.

I have tried several configurations, at the end I recycled a coil from a phone splitter.

Step 2: Components

Required Components:

• Arduino nano
• lipo battery
• Voltage up-converter (any)
• 10nF ceramic capacitor
• Buzzer
• 1k resistor
• 330-ohm resistor
• LED
• 1N4148
• diode
• Support (in my case credit card)
• BatterySwitch
• Coil (highest inductance as possible, check with tester on 200-ohm)
• Glue (epoxy)
• Cables (from broken LAN cable for added rigidity)

Step 3: The Code and Circuit

As I said this project is a modification of the following original instructable:

https://www.instructables.com/id/Simple-Arduino-Me...

Step 4: Final Version

As you can see, it is very fast and with good sensitivity.