🏗️ DIY Infrastructure & Fabrication: Complete Map

Mission: Equip communities with knowledge, tools, and designs to build and repair technological infrastructure from first principles.

🎯 Skill Progression Path

Tier 1: Fundamentals (Weeks 1-4)

Essential knowledge before touching tools.

• Electronics-Fundamentals

  • Voltage, current, resistance (Ohm's Law)
  • Series and parallel circuits
  • Power consumption calculations
  • Safety (shock, fire, explosion)

• Hand-Tools-Mastery

  • Soldering iron technique (cold joints, bridges, cleanup)
  • Multimeter: how to measure everything
  • Crimping and wire stripping
  • Desoldering techniques (solder sucker, solder wick)

• Reading-Datasheets

  • Pin configurations
  • Electrical characteristics
  • Timing diagrams
  • Absolute maximum ratings (respect these)

• Safety-First

  • Electrical hazards and PPE
  • Fire extinguisher selection (NO water on electronics fires)
  • First aid for electrical injuries
  • Workspace safety protocols

Outcome: Can safely solder, measure, and understand component data.

Tier 2: Microcontrollers (Weeks 5-12)

Building blocks of automation.

• Arduino-Foundations

  • Development environment setup
  • Digital I/O (HIGH/LOW, pins, modes)
  • Analog I/O (ADC, PWM, DAC basics)
  • Serial communication (debugging lifeline)

• Raspberry-Pi-Guide

  • GPIO header and pinout
  • Python vs. C for controlling pins
  • Real-time limitations (it's not a hard-real-time OS)
  • Headless setup and SSH access

• Sensor-Integration

  • Temperature (DHT11, DS18B20, thermocouples)
  • Light (phototransistors, LDRs)
  • Motion (PIR, accelerometers)
  • Pressure (barometric, load cells)
  • Flow (water meters, anemometers)

• Actuator-Control

  • Relays (electromechanical, logic level, safety)
  • MOSFETs and BJTs (motor drivers, high current)
  • Servo motors (PWM control, positioning)
  • Stepper motors (microsteps, holding torque)
  • Solenoids and electromagnets

• Communication-Protocols

  • Serial (UART, RS-232, RS-485)
  • SPI (Serial Peripheral Interface)
  • I2C (two-wire protocol, addressing, timing)
  • CAN bus (automotive/industrial standard)

Outcome: Build measurement and control systems end-to-end.

Tier 3: PCB Design & Fabrication (Weeks 13-24)

From schematic to working circuit board.

• Schematic-Design

  • EDA tools (KiCad recommended—free, open-source)
  • Component symbols and footprints
  • Netlist generation
  • Design for manufacturability (DFM)

• PCB-Layout

  • Copper trace routing (signal integrity, impedance)
  • Power distribution (star grounding, current paths)
  • Layer stackup design (single-layer to 4-layer)
  • Thermal management (copper pour, vias)
  • Manufacturing constraints (minimum trace width, annulus, spacing)

• Prototyping-Methods

  • Breadboarding (for initial testing, not production)
  • Veroboard and stripboard (hand-wired, good for small runs)
  • Home PCB etching (ferric chloride, laser toner, UV exposure)
  • Professional fabrication (when to outsource, cost optimization)

• Component-Selection

  • Choosing ICs (equivalent parts, availability, cost)
  • Passive components (resistor tolerances, capacitor types, inductors)
  • Power components (voltage regulators, buck converters)
  • Connectors and mechanical (right-angle vs. straight, durability)

• Testing-Debugging

  • Continuity checking (before power-on)
  • Power supply verification (with no load first)
  • Signal tracing (scope usage)
  • Design failure analysis (shorts, opens, wrong values)

Outcome: Design custom boards for specific applications.

Tier 4: Manufacturing Systems (Weeks 25+)

Making things at scale.

• 3D-Printing

  • FDM technology (layer height, infill, support structure)
  • Resin printing (precision, post-processing, toxicity)
  • Material selection (PLA, PETG, TPU, engineering polymers)
  • Design for 3D printing (wall thickness, bridging, print orientation)
  • Multi-material printing and assembly

• CNC-Machining

  • Mills vs. routers (for wood, aluminum, PCB milling)
  • Tooling (bits, feeds, speeds, cutting fluid)
  • CAM software (tool path generation, simulation)
  • Safety (workholding, cutting hazards, chip management)

• Laser-Cutting

  • CO2 and fiber lasers (different materials)
  • Raster vs. vector (engraving vs. cutting)
  • Material compatibility (never cut PVC—releases chlorine gas)
  • Power and speed settings by material

• FPGA-Basics

  • What FPGAs do differently (parallel hardware)
  • VHDL/Verilog (hardware description languages)
  • Open-source tools (Project Trellis, nextpnr)
  • Real-time signal processing applications

Outcome: Scale production from 1-off to hundreds.

🛠️ Equipment & Setup

Minimum Starter Kit (~$300-500)

Soldering & Desoldering:
- [ ] 40W soldering iron + stand
- [ ] Solder (lead-free, 60/40 tin/lead OK too)
- [ ] Solder sucker or desoldering pump
- [ ] Brass sponge (easier than wet)
- [ ] Solder wick

Measurement:
- [ ] Digital multimeter (Fluke is overkill; cheap ones work)
- [ ] Measuring tape, calipers
- [ ] Oscilloscope (USB oscilloscope $50+, adequate)

Hand Tools:
- [ ] Screwdrivers (Phillips + flat, various sizes)
- [ ] Needle-nose pliers (2x, different tips)
- [ ] Wire cutters and strippers
- [ ] Helping hands (third-hand tool for soldering)

Components & Storage:
- [ ] Assorted resistors, capacitors, diodes (starter kit $20)
- [ ] Arduino or Raspberry Pi Pico ($10-40)
- [ ] Breadboard + jumper wires
- [ ] Component storage (part bins, labeling)

Safety:
- [ ] Eye protection (solder splash, small parts)
- [ ] Fire extinguisher (Class C or multi-purpose)
- [ ] First aid kit (yes, really)
- [ ] Ventilation (small fume extractor if indoors)

Mid-Level Workshop (~$2,000-5,000)

Electronics Fabrication:
- [ ] Reflow oven or hot plate + temperature control
- [ ] PCB fabrication supplies (ferric chloride, isopropyl alcohol)
- [ ] Vacuum hold-down table (for small boards)

Measurement:
- [ ] Bench multimeter (better accuracy)
- [ ] Oscilloscope (bench model, 200MHz sufficient)
- [ ] Logic analyzer (for digital signal debugging)
- [ ] Power supply (programmable 0-30V, 0-10A)

Manufacturing:
- [ ] 3D printer (Prusa, Creality, open-source options)
- [ ] Small CNC router (Shapeoko, CNC3018)
- [ ] Laser cutter (40W CO2, shared access?)

Storage & Safety:
- [ ] Anti-static workbench
- [ ] Proper storage (climate controlled if humid area)
- [ ] Fume extraction system
- [ ] Hazardous material disposal plan

Advanced Workshop (~$10,000+)

Add to mid-level:
- [ ] Fiber laser (for metal engraving)
- [ ] Electron microscope (for PCB inspection)
- [ ] Thermal camera (debugging heat issues)
- [ ] Spectrum analyzer (RF work)
- [ ] FPGA development boards and tools

🔧 Project Templates

Template 1: Temperature Monitor + Alert

Skills: Tier 1-2 | Time: 4 hours | Cost: $20-30

Build:

• Arduino + DHT22 temperature sensor
• LCD display + buzzer
• Thresholds for alerts
• Battery-powered or solar-charged

Related: Arduino-Foundations, Sensor-Integration, Power-Management

Template 2: Home Energy Monitor

Skills: Tier 2 | Time: 8-12 hours | Cost: $100-200

Build:

• Current sensors (clamp-type CT sensors)
• AC voltage reference circuit
• Arduino-based data logger
• Local web dashboard or SD card storage

Related: Sensor-Integration, Data-Logging, Power-Consumption-Calculation

Template 3: Custom PCB: Solar Charge Controller

Skills: Tier 3 | Time: 40-60 hours | Cost: $200-400

Design:

• PWM charge control circuit
• Battery voltage monitoring
• Load disconnect on low voltage
• Current limiting and thermal shutdown
• KiCad schematic + layout

Manufacturing:

• Home etching OR professional fab
• Component assembly
• Testing and tuning

Related: Schematic-Design, PCB-Layout, Solar-Charge-Controllers

Template 4: 3D-Printed Enclosure

Skills: Tier 4 | Time: 8-16 hours | Cost: $50-150

Design:

• Model electronics in Fusion 360 / FreeCAD
• Custom mounting features
• Cable routing internal
• Access panels for components
• Print orientation and support strategy

Production:

• Multiple iterations (test prints cheap)
• Final assembly and finishing

Related: 3D-Printing, CAD-Basics, Design-for-Manufacturability

📊 Common Failure Analysis

Problem: Intermittent Connections

Root Cause: Cold solder joints, contact corrosion, vibration
Prevention: Soldering-Technique, stress relief, conformal coating
Fix: Reflow or reheat + inspect under magnification

Problem: Noise in Analog Signals

Root Cause: Inadequate grounding, unshielded cables near high-current paths
Prevention: Star grounding, twisted pair, ferrite cores
Fix: Add filtering (capacitors, LC filters), reroute traces

Problem: Microcontroller Resets Unexpectedly

Root Cause: Voltage drops, floating pins, watchdog timer
Prevention: Decoupling capacitors, pull-ups/pull-downs, watchdog tuning
Fix: Power supply upgrade, scope power rail noise

Problem: Fuse/Breaker Keeps Blowing

Root Cause: Short circuit, overload, wrong fuse rating
Prevention: Circuit design, fuse sizing by wire/load
Fix: Find short with resistance measurement, trace layout review

🌐 Open-Source Design Examples

Boards (All on GitHub)

• OpenBMS: DIY battery management system
• Charge Controller PCB: MPPT solar charge regulator
• LoRaWAN Gateway: Range extension for IoT
• Wireless Sensor Nodes: Ultra-low-power designs

Designs (Searchable on Hackaday)

• Emergency Radio: Crank + solar powered
• Water Level Monitor: Tank/well automation
• Solar Tracker: Sun-following optimization

Machines (RepRap Community)

• Prusa i3: Open-source 3D printer
• CNC2418: Compact CNC router design
• Laser Cutter: CO2 tube and optics sourcing

🎓 Learning Resources

Youtube Channels:

• Paul McWhorter (Arduino, excellent pedagogy)
• GreatScott! (practical electronics projects)
• JohnnyLuu (PCB design + manufacturing)
• Andreas Spiess (IoT systems)

Websites:

• Electronics Tutorials (electronics-tutorials.ws)
• All About Circuits (allaboutcircuits.com)
• EEjournal (thoughtful analysis)

Books:

• "Art of Electronics" (Horowitz & Hill) — the bible
• "Make: Electronics" (Platt) — hands-on, beginner-friendly
• "PCB Design for Real-World EMI Control" (Johnson & Graham)

✅ Implementation Checklist

Phase 1: Fundamentals (Month 1)

• Safety course completed
• Soldering proficiency (can solder without bridges)
• Multimeter operation mastered
• First Arduino program runs

Phase 2: System Building (Months 2-3)

• 3+ complete Arduino projects with sensors
• I2C and SPI communication working
• Data logging to SD card or cloud
• Basic enclosure design

Phase 3: PCB Design (Months 4-6)

• KiCad proficiency achieved
• First custom PCB laid out and manufactured
• Home etching OR outsourced fab order placed
• Board assembled and tested

Phase 4: Advanced Manufacturing (Months 7+)

• 3D printer fully operational
• CNC or laser cutter access secured
• Design portfolio with 3+ projects
• Teaching others on staff

🔗 Quick Links

Getting Started: Electronics-Fundamentals | Hand-Tools-Mastery
Microcontrollers: Arduino-Foundations | Raspberry-Pi-Guide
PCB Design: Schematic-Design | PCB-Layout
Manufacturing: 3D-Printing | CNC-Machining
Projects: Home-Energy-Monitor | Solar-Charge-Controller

Status: Active
Last Updated: [DATE]
Maintainers: See Contributors