# [DIY Kit Name] — Build Guide

**Version:** [v1.0]  
**Date:** [YYYY-MM-DD]  
**Author:** [Name / Contact]  

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## 1. Introduction
- What this kit does (short description).  
- Skill level required (Beginner / Intermediate / Advanced).  
- Estimated build time: [X hours].  
- Tools required: [Soldering iron, multimeter, etc.].  

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## 2. Circuit Description
### 2.1 General Idea
- Short explanation of the concept.  
- Example: *The kit demonstrates low-power control using an ATtiny85 microcontroller. It blinks an LED in Morse code and sleeps when ambient light is detected.*  

### 2.2 Annotated Schematic
*(Insert schematic image exported from KiCad, e.g., as PNG or PDF)*  

Use numbered blocks for explanation. Example:  

**Figure 1: Schematic with annotation numbers**  

| Block | Circuit Section   | Description                                                                                           |
|:-----:|:------------------|:------------------------------------------------------------------------------------------------------|
| 1     | Power Supply      | 2×AA batteries → DC/DC regulator (U1) → 5 V rail. Decoupling capacitors (C1, C2) smooth the voltage.  |
| 2     | Controller        | ATtiny85 (U2) running firmware. Pull-up resistors (R1, R2) ensure stable inputs.                      |
| 3     | LED Output        | LED D1 driven by PB0. Current limited by R3 (330 Ω).                                                  |
| 4     | Light Sensor      | LED D2 reverse biased → generates photocurrent. Read on PB2.                                          |
| 5     | Programming Header| ISP 6-pin header for flashing firmware.                                                               |
| 6     | Test Points       | Labeled pads J1–J3 for debugging with a multimeter.                                                   |

*(Link to the KiCad schematic file in Git repo, e.g.: [GitHub/Gitea link])*  

### 2.3 Functional Flow
- Add a block diagram showing logic signal flow (KiCad → export block diagram or draw in Mermaid).  
- Example: *Battery → DC/DC → ATtiny85 → LED driver → LED.*  

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## 3. Mechanical Parts
### 3.1 2D CAD Files
- Mechanical drawings in DXF for front panel / housing.  
- Dimensions, hole positions, and cut-outs for connectors.  

### 3.2 3D Models
- STL/STEP files for 3D printing, if available.  
- Assembly orientation, support recommendations.  

*(Link to repo with mechanical CAD files.)*  

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## 4. Kit Contents
*(BOM table)*  

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## 5. Safety Notes
⚠️ Soldering involves heat. Work on a non-flammable surface.  
⚠️ Observe polarity on diodes, electrolytic capacitors, and ICs.  

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## 6. Assembly Instructions
*(step-by-step with images/photos)*  

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## 7. First Power-Up
*(preconditions + test steps)*  

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## 8. Adjustments / Calibration
*(potentiometer trim, jumper setting, firmware config)*  

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## 9. Troubleshooting
*(table with symptoms and remedies)*  

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## 10. Next Steps / Modifications
*(extensions, software mods, hardware mods)*  

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## 11. Resources
- **Git Repository:** [link]  
- **KiCad Project Files:** [link]  
- **DXF Mechanical Files:** [link]  
- **STL/3D Models:** [link]  
- **Firmware Source Code:** [link]  
- **Datasheets:** [links]  

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## 12. Document Control
| Version | Date       | Author     | Changes                                   |
|:-------:|:----------:|:-----------|:------------------------------------------|
| 1.0     | YYYY-MM-DD | [Name]     | Initial release                           |