Doni Zhang — Engineering & AI

Projects

What I've Been Building

A collection of projects at the intersection of AI, embedded systems, and engineering — built to solve real-world problems.

AI Voice Assistant on ESP32

A low-latency voice assistant powered by ESP32 with cloud AI integration. Captures audio via INMP441 I2S microphone, streams to Whisper API for speech recognition, generates responses with GPT, and speaks back through Edge-TTS — all in real-time.

ESP32 + INMP441 I2S microphone for high-quality audio capture

Real-time WebSocket audio streaming to Flask backend

Whisper API integration for multilingual speech recognition

GPT-powered conversational responses with context awareness

Edge-TTS for natural Spanish and English voice synthesis

Low-latency pipeline optimized for embedded hardware

ESP32INMP441Whisper APIGPTEdge-TTSFlaskIoTWebSocket

Real-time Subtitle Translator

A desktop application that captures system audio output and provides real-time Spanish-to-Chinese subtitles. Built with PyQt5 for the overlay UI, Whisper for transcription, and GPT for translation.

System audio capture via WASAPI loopback

Real-time Whisper transcription with Spanish language model

GPT-4 powered Spanish-to-Chinese translation

PyQt5 semi-transparent overlay UI (always-on-top)

Subtitle history buffer with scroll-back

Customizable font size, position, and opacity

WhisperGPT-4PyQt5PythonSpanishReal-timeTranslation

Spanish Learning App

A mobile-first web application for learning Spanish vocabulary tailored to engineering professionals. Features audio pronunciation, spaced repetition, and real workplace scenarios.

Category-based vocabulary organized by work scenarios

Edge-TTS powered audio pronunciation (Argentine Spanish voice)

Spaced repetition algorithm based on the forgetting curve

Dark mode optimized for late-night study sessions

Progress tracking and daily streak motivation

Fully responsive — works great on mobile devices

FlaskPythonSQLiteEdge-TTSTailwind CSSMobileEducation

PV Power Plant Safety Management

Comprehensive HSE management for a large-scale photovoltaic power plant construction project in Argentina. Led cross-cultural safety teams, implemented AI-powered PPE detection, and developed digital safety management systems.

Safety management system design for 200MW+ PV project

AI-powered PPE compliance monitoring using computer vision

Trilingual safety training programs (Chinese, English, Spanish)

Real-time safety document translation via GPT-4

Predictive risk analysis using weather and schedule data

Cross-cultural team leadership (Argentine, Chinese, Bolivian workers)

Solar PVHSEArgentinaEPCAI VisionProject Management