DEMINEUA.ORG MD V1
is a free and open source low cost pulse induction metal detector to aid in humanitarian demining in Ukraine.
It consists of easily sourceable parts to aid in distributed production in makerspaces or volunteer organizations.
Main specs:
# RP2040 mcu based, unipolar, direct sampling, 14bit ADC
# Built-in, rechargeable battery (2x 18650)
# Vibration, LED, voice speech UI, supports headphones
# Printed circuit board based search coil for ease of manufacturing
# Easily 3D printable or hardware store sourced mechanical parts
# Total cost @ QTY 100 is around 35€/pc
This project is still in experimental stage, but the hardware release listed below has been shipped to Ukraine for evaluation and it is overall adequately operational.
There are many aspects of this design which require improvements, however we think that it may be of public benefit to release this project already at this stage.
We are seeking input on how to improve this design, signal processing and overall usefulness. Any feedback is welcome by writing us (thisdomainname) at gmail dot com.
This is not a git repository for privacy purposes.
Bill of materials
| Part | Files | QTY | Type | Notes |
| Main box | 1 | Assembly | ||
| ├Main-PCB-R3 | (SCH) (Kicad) (Prod files) (Stackup) | 1 | PCBA | Used JLCPCB assembly and mostly LCSC parts |
| │ ├ 2x5P 2.54mm header | 1 | Component | LCSC # C124387 | |
| │ ├ 18650 holder | 2 | Component | LCSC # C5290175 | |
| │ ├ 18650 battery | 2 | Component | ||
| │ ├ Damping resistors 1206 | 2 | Component | LCSC # C2933608 (target damping is 840R, change as needed) | |
| │ ├ Firmware | (Source) (Binary) | 1 | FW | Flash as uf2 (hold JP1 closed when power on) |
| │ └ Configuration tool | (pigui) | - | Tool | Lets you configure MD parameters. Follow readme.md |
| ├Main box enclosure | (STEP) | 1 | 3D printed part | PET-G or ABS |
| ├Main box clamp | (STEP) | 1 | 3D printed part | PET-G or ABS |
| ├Vibration motor | 1 | Component | LCSC # C5184582 | |
| ├Speaker cable | (Drawing) | 1 | Component | Custom, can be made for ~1$ or less with shipping |
| ├Speaker | 1 | Component | LCSC # C530552 | |
| ├Speaker mesh | Diameter 28mm | 1 | Lasercut part | Black geotextile, lasercut (optional) |
| ├Port cover | (STEP) | 1 | 3D printed part | PET-G or ABS |
| ├Screw ST | 2.3x8 | 5 | Component | LCSC # C357465 |
| ├Nut M6 DIN934 | 2 | Component | ||
| ├Plastic handle bolt M6x30 | 2 | Component | Alternatively DIN316 | |
| ├Front panel PCB | (Kicad) (Prod files) (Stackup) | 1 | PCB | |
| └Front panel spacer | (DXF) | 1 | Component | Lasercut PETG/PE or any other <1mm plastic |
| Rod | 1 | Assembly | ||
| │ │Wooden Rod | 1 | Subassembly | ||
| │ ├Wooden rod | 1 | Rake handle, wooden, 24mm dia, 600mm length | ||
| │ ├Wood paint | Material | |||
| │ ├Rod coil holder | (STEP) | 1 | 3D printed part | PET-G or ABS |
| │ ├6x25~30mm wooden dowel | 2 | Component | ||
| │ └PVA GLUE | Material | |||
| └Aluminium rod | 1 | Subassembly | ||
| ├Aluminum pipe | (bending guide – PDF) | 1 | Component | 20mm OD, 1-1.5mm wall thickness, 700mm, need cheap pipe bender |
| ├Heating pipe insulation | 1 | Component | 18mm ID, PE material, 250mm | |
| ├Spray adhesive | Material | Spray adhesive for pipe insulation | ||
| ├Armrest | (STEP) | 1 | 3D printed part | PET-G or ABS |
| ├Nut M6 DIN934 | 1 | Component | ||
| ├Washer M6 DIN125 | 2 | Component | ||
| ├M6x45 DIN316 | 1 | Component | ||
| ├Rod connector | 1 | 3D printed part | ||
| ├Plastic handle bolt M6x30 | 2 | Component | Alternatively DIN316 | |
| ├M8x40 nylon bolt | 1 | Component | ||
| └M8 butterfly nut | 1 | Component | ||
| Coil | 1 | Assembly | ||
| ├Coil PCB | (Kicad) (Prod files) (Stackup) | 1 | PCB | |
| ├Jumper PCB | (Kicad) (Prod files) (Stackup) | 1 | PCB | |
| ├RG58 SMA coax cable | (Drawing) | 1 | Component | |
| ├Strain relief | 1 | Component | 632-01020 | |
| ├Coil bottom shell | (STEP) | 1 | 3D printed part | ABS |
| ├Coil top shell | (STEP) | 1 | 3D printed part | ABS |
| └ABS juice | Material | ABS + MEK or ABS + Acetone |