Project Fully Functional & Completed
VLF Metal Detector
Technological Review & Implementation Archive
Jan 5 - Jan 19, 2026 · Submission Ready
Mads
Project Lead
Firmware, documentation, integration, user features
64 commits
65%
Sigurd
Hardware Engineer
QSPICE simulations, H-bridge design, KiCad schematics
11 commits
11%
Andreas
Signal Processing
DSP algorithms, RX amplifier design, IIR filter
11 commits
11%
Jonas
Theory & Review
Maple calculations, coil theory, code reviews
7 commits
7%
Contribution Activity
99 commits in 15 days
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Development Gantt Chart
Filter by team member to highlight their contributions
Jan 5
Jan 7
Jan 9
Jan 11
Jan 13
Jan 15
Jan 17
Jan 19
Infrastructure (Mads)
Project Setup
Documentation
Theory (Jonas)
Maple Calculations
B-Fields & Inductance
DSP (Andreas)
Signal Processing
TX/RX Chain
IIR Filter
Circuit Simulation (Sigurd)
QSPICE Model
H-Bridge (98% eff)
KiCad Schematic
RX Amplifier (Andreas)
Circuit Design
KiCad RX + MCU
Hardware (Mads)
TX Driver Design
Coil Verification
Power Budget
Firmware (Mads + Jonas)
Debug System
Arduino Nano Port
Code Modularization
User Features (Mads)
Start/Stop & Calibration
Metal Classification
HUD & Audio
Testing (Mads)
MATLAB Tools
Bug Fixes
Team Contributions
Click on a team member to see their detailed contributions
Mads
Project Lead
Firmware architecture, documentation, integration, user features
52 commits
60%
Sigurd
Hardware Engineer
QSPICE simulations, H-bridge design, KiCad schematics
12 commits
14%
Andreas
Signal Processing
DSP algorithms, RX amplifier design, IIR filter
11 commits
13%
Jonas
Theory & Review
Maple calculations, coil theory, code reviews
7 commits
8%
Key Milestones
Major achievements throughout the project
January 5, 2026
Project Infrastructure & Repo Setup
Mads
January 7, 2026
VLF Resonance & Induction Theory
Jonas
January 8, 2026
QSPICE Power Stage Validation
Sigurd
January 9, 2026
High-Performance DFT Processing
Andreas
January 11, 2026
H-Bridge Efficiency Benchmark (98%)
Sigurd
January 14, 2026
Precision RX Signal Chain Designed
Andreas
January 15, 2026
Master Coil Nulling Accuracy Achieved
Jonas
January 17, 2026
Metal Classification Algorithms
Mads
January 18, 2026
Graphic HUD & Visual Indicators
Mads
January 19, 2026
Full System Integration & QA
Mads
January 20, 2026
Mechanical Assembly & Field Success
Mads
Sigurd
Andreas
Jonas
Full assembly with PCBs in enclosure, mounted on wooden dowel. Fully functional metal detector.
January 23, 2026
Final Project Report & Documentation
Mads
Sigurd
Andreas
Jonas
Technical documentation finalized and submitted. Comprehensive review of all DSP and hardware subsystems.
Responsibility Matrix
Who owns what across the project
| Section | Primary Owner | Support | Commits | Description |
|---|---|---|---|---|
| Infrastructure | Mads | - | 12 | Project setup, documentation structure, build systems |
| Theoretical Foundation | Jonas | - | 5 | Mathematical models, Maple calculations, EM theory |
| DSP Theory & Algorithms | Andreas | Mads | 6 | Signal processing design, DFT analysis, filter specs |
| Circuit Simulation | Sigurd | Mads | 9 | QSPICE/LTspice modeling, efficiency optimization |
| RX Amplifier Design | Andreas | - | 6 | Receiver amplifier design, KiCad schematic |
| Hardware Integration | Mads | Sigurd | 10 | TX driver, coil design, power budget |
| Firmware Development | Mads | Jonas | 15 | ATmega328P code, timers, modular architecture |
| User Features | Mads | - | 8 | Detection modes, calibration, display, audio |
| Testing & Verification | Mads | - | 6 | MATLAB verification, test plans, bug fixes |
Technology Stack
Tools and technologies used in this project
C (AVR-GCC)
Firmware for ATmega328P
MATLAB
DSP verification & analysis
Maple
Symbolic calculations
QSPICE
Circuit simulation
LTspice
Analog simulation
KiCad
PCB design & schematics
Markdown
Documentation
LaTeX/Overleaf
Report generation
Meeting Notes & Decisions
Key discussions and decisions from team meetings
📋
Meeting #1
January 6, 2026
Focus: Initial planning and TX components
- ✓ Investigated how different parts of the metal detector should be designed
- ✓ Focus on TX components established as priority
- → Action: Mads to prepare power consumption draft
- → Action: Decide on coil design by next day
📋
Meeting #2
January 8, 2026
Focus: Progress review and milestone
planning
Completed Items
- ✓ Coil design completed (tuning may occur)
- ✓ Simulated various coil dimension variants
- ✓ TX, RX, and DSP software ready for testing
- ✓ Working H-bridge amplifier for AP amplifier
Key Decisions
- ⚡ Coil diameter: Fixed at 20cm outer diameter for 3D model
- ⚠ Known issue: PMOS transistors may exit saturation as battery drains
Deadlines Set
- 📅 Jan 9: Prototype software for DSP, TX, RX, and AP control
- 📅 Week 3 start: RX amplifier basic design complete
- 📅 Week 3: Everything ready for testing and redesign
- 📅 Ongoing: Begin writing SOTA and analysis in report
Decision Timeline
Jan 6
TX Focus
Priority on transmitter
components
Jan 8
20cm Coil
Outer diameter locked
Jan 8
H-Bridge Design
AP amplifier confirmed
Jan 9
Prototype Target
Software milestone
Week 3
Test Phase
Full system testing
System Overview
Interactive hardware architecture and real-world performance benchmarks
Interactive Battery Performance Lab
Real-world 9V Alkaline discharge curve under 2kHz system load.
TEST SUMMARY
PASSED ✓
Runtime: 164.3 min
Volt Drop: 1190 mV
Avg Rate: 7.2 mV/min
Voltage (V)
Time (0-300 min)
Active System Load
Cutoff (6.0V)
Material Discrimination
One-touch signal shift visualization
TARGET IDENTITY:
CLEAR
98%
H-Bridge Efficiency
Validated via QSPICE Thermal Simulation
