STM32 + ESP32 Energy Monitoring Dashboard ⚡

An RTOS-based dual-MCU project showcasing real-time data acquisition, signal processing, and IoT visualization.
Designed as a portfolio-grade project to demonstrate embedded firmware, multitasking (RTOS), and system integration skills.

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⚡ Why This Project?

This project is more than just a data logger. It demonstrates:

• RTOS Task Management (on STM32)
• DMA-driven ADC Sampling for real-time performance
• Signal Processing (Vrms, Irms, Power, Power Factor, Temperature)
• Inter-MCU Communication (UART between STM32 ↔ ESP32)
• IoT/Web Integration (ESP32 with WebSocket + Chart.js Dashboard)
• Clean System Design (separation of acquisition, processing, and visualization)

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⚡ System Architecture

  ┌─────────────────────┐
  │   STM32F446RE       │
  │  (Nucleo Board)     │
  │                     │
  │  • ADC + DMA        │
  │  • RTOS Tasks       │
  │  • Signal Processing│
  │      Vrms, Irms     │
  │      Power, Temp    │
  └─────────┬───────────┘
            │ UART
            ▼
  ┌─────────────────────┐
  │      ESP32          │
  │   (WiFi + Web)      │
  │                     │
  │  • UART Rx Parser   │
  │  • WebSocket Server │
  │  • HTML/JS Dashboard│
  └─────────┬───────────┘
            │ WiFi
            ▼
  ┌─────────────────────┐
  │   Web Browser       │
  │  (PC / Mobile)      │
  │  • Live Charts      │
  │  • Stats View       │
  └─────────────────────┘

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⚡ Tech Stack

• MCU 1 (STM32F446RE, Nucleo)

  • FreeRTOS for task scheduling
  • ADC with DMA for fast sampling
  • Processing tasks for Vrms, Irms, Power, Temp
  • UART Tx for inter-MCU comms

• MCU 2 (ESP32)

  • UART Rx + packet parsing
  • Async WebSocket Server
  • Data pushed to Web Dashboard

• Frontend

  • Chart.js for real-time graphs
  • HTML/CSS/JS for clean UI

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⚡ Skills Demonstrated

• RTOS design (task creation, synchronization, DMA-driven I/O)
• Signal processing on MCU
• Reliable inter-MCU communication (UART framing, error handling)
• IoT integration with ESP32 and WebSocket server
• Frontend visualization with Chart.js

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⚡ Demo

• Left Side: Real-time sine waveforms (Voltage, Current)
• Right Side: Numeric stats (Power, Vrms, Irms, Temp)
• Updates live via WebSockets