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ideologhy-code-hardware-pcb-cad-firmware

Project Journey – AI Voice Assistant

(15 Days | ~7–8 Hours Per Day)

Day 1 – Understanding the Problem & Feature Brainstorming

Spent most of the day understanding what an AI voice assistant should realistically do.
Wrote down ideas, removed over-complex features, and finalized a practical feature list.
Researched existing assistants to avoid copying and to find gaps.

Day 2 – Feature Freezing & Component Research

Converted the feature list into technical requirements.
Shortlisted components and checked availability, cost, and compatibility.
Changed microcontroller choice once due to memory limitations.

Day 3 – System Architecture & Block Diagram

Created a full system flow: voice input → processing → response → output.
Made multiple rough block diagrams before finalizing one.
Reviewed power requirements and signal flow carefully.

Day 4 – Firmware Logic Planning

Planned firmware structure in detail.
Wrote flowcharts and pseudocode instead of jumping into coding.
This saved time later during debugging.

Day 5 – Firmware Setup & Basic Tests

Set up the IDE and libraries.
Faced dependency errors and version conflicts.
By the end of the day, basic firmware was compiling correctly.

Day 6 – Audio Input Integration

Worked on microphone input.
Faced noise and low sensitivity issues.
Tried multiple configurations before getting stable audio capture.

Day 7 – Speech-to-Text Integration

Integrated speech-to-text service.
Initial results were inaccurate.
Spent time adjusting audio gain, sampling rate, and buffering.

Day 8 – AI Response & Logic Handling

Implemented AI processing and response logic.
Focused on making responses sound natural instead of robotic.
Handled edge cases like silence and unclear commands.

Day 9 – Text-to-Speech & Speaker Output

Integrated text-to-speech output.
Faced speaker distortion issues.
Solved it by improving power regulation and audio routing.

Day 10 – Breadboard Hardware Testing

Assembled complete hardware on a breadboard.
Experienced loose connections and random resets.
Rewired everything neatly and added decoupling capacitors.

Day 11 – PCB Schematic Design

Designed PCB schematic from the tested circuit.
Cross-checked pin mapping and power lines multiple times.
Corrected mistakes found during review.

Day 12 – PCB Layout & Revision

Worked on PCB layout carefully, especially audio lines.
Made spacing adjustments to reduce noise.
Revised the layout twice to improve reliability.

Day 13 – CAD Enclosure Design

Designed the enclosure using CAD software.
Initially underestimated speaker size.
Redesigned the enclosure to fit all components comfortably.

Day 14 – Full System Integration & Stress Testing

Mentally simulated PCB behavior and firmware flow together.
Tested long conversations, repeated commands, and power cycles.
Fixed small logic bugs and response delays.

Day 15 – Documentation, Demo & Final Review

Prepared project documentation and journey notes.
Recorded demo responses and test scenarios.
Reviewed the entire project like an evaluator would