Flexible Metal Detector

Taking inspiration from @BugejaCarl I whipped up a flexible metal detector board based on lpodkalicki 's attiny13 design

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A flexible metal detector board based on a attiny13 design. As well as research into both flexible pcb's and coil traces.

The concept here is a wearable giving extra sense or enviroment interaction. Future plans include CV output, hap-tic feedback, Li-Po battery

This is an entry for the Flexible PCB Contest

Inspiration: [Carl]

Original Schematic Design

OSHPark Guidlines & DRC


JPEG Image - 63.73 kB - 03/08/2019 at 04:30



The original code for ATtiny13

C Source File - 2.04 kB - 03/08/2019 at 04:29


  • 1 × IRF3205 Discrete Semiconductors / Power Transistors and MOSFETs
  • 1 × 1N4007 Discrete Semiconductors / Diodes and Rectifiers
  • 2 × 1N4148 Discrete Semiconductors / Diodes and Rectifiers
  • 1 × 10kΩ
  • 2 × 220Ω

View all 9 components

  • Designing Coils for PCB

    Ray Olsen03/08/2019 at 04:56 0 comments

    I really just wanted to jump into this project, mainly with out thinking/looking

    I've seen [Carl]'s projects hear and some of his progress on twitter.  I popped open EagleCAD and went straight for the ULP's.  


    copying the spec's from the original:

    I went with 0.5 mm for the width and 30 turns as specified 

    I used 0.2 spacing as that is the minimum for flexible PCB from OSHpark

    Which dumped out this:

    I wasn't sure if i was going to be able to line up the vias since Eagle is a baby.  I am going to look into separating this as well as spacing out the center to make a more usable coil for metal detecting.

    Read more »

  • Project Page Creation

    Ray Olsen03/08/2019 at 04:34 0 comments

    1. Created page
    2. Added reference files
    3. Added new schematic design


    • Get PCB made
    • Test Components
    • Create Detailed BOM
    • Create Tindie Page
    • Modify Design
    • Iterate

View all 2 project logs

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Łukasz Podkalicki wrote 03/26/2019 at 15:48 point

Hi Ray, wareable detector is cool idea! :) Next version is using AO3400 (or IRLML6344) instead if IRF3205. I think smaller mosfet package is a good fit to your project requirements. 

Cheers, LP

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