Automated Tea Brewer

Design and Implementation of a Fully Automated ESP32-Based Tea Brewer

ESP32 · Embedded Systems · C · FreeRTOS · LVGL · TMC2130 · Stepper Motor · IoT

Repository · Documentation · Getting Started

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Project Annotation

This project presents the design and implementation of a fully automated tea brewing system based on ESP32 microcontrollers. The system consists of two ESP32 modules working in tandem:

Module	Microcontroller	Function
Display Controller	ESP32-S3	Touchscreen UI using LVGL graphics library
Motor Controller	ESP32-C6	Stepper motor control via TMC2130 driver

Key Features

• IR Thermometer - Precise water temperature monitoring
• Laser Distance Sensor - Teapot presence detection (VL53L0X)
• Induction Cooker Interface - Automated heating control via optocoupler
• Stepper Motor Control - Precise tea bag immersion with TMC2130
• Touchscreen Interface - Intuitive LVGL-based user interface
• Web Dashboard - Remote control via WiFi with mDNS support (teabrewer.local)
• Programmable Brewing - Configurable temperature, steeping time, and movement

The goal was to create a fully autonomous tea brewing appliance that can prepare tea with consistent quality by precisely controlling brewing temperature, steeping time, and tea bag movement.

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Documents

Document	Path
Paper	View Paper
Images & Screenshots	View Images

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Project Structure

Automated-Tea-Brewer/
├── src/                          # Source code
│   ├── tea-brewer/               # ESP32-S3 Display Controller
│   │   ├── main/
│   │   │   ├── app_main.c           # Application entry point
│   │   │   ├── uart_comm.c/h        # UART communication
│   │   │   ├── settings.c/h         # User settings management
│   │   │   ├── webserver.c/h        # Web dashboard server
│   │   │   └── ui/                  # LVGL user interface
│   │   ├── components/
│   │   │   ├── bsp/                 # Board Support Package
│   │   │   └── esp_lcd_touch_cst816s/
│   │   └── managed_components/      # ESP-IDF dependencies
│   │
│   └── tea-brewer-controller/    # ESP32-C6 Motor Controller
│       ├── main/
│       │   ├── main.c               # Application entry point
│       │   ├── motor/               # TMC2130 stepper control
│       │   ├── temperature_sensor/  # IR thermometer interface
│       │   ├── distance_sensor/     # VL53L0X laser sensor
│       │   ├── pot_sensor/          # Teapot detection
│       │   ├── protocol/            # ESP-to-ESP communication
│       │   ├── console/             # USB Serial debug interface
│       │   ├── scheduler.c/h        # Task scheduling
│       │   └── rtc/                 # Real-time clock
│       └── components/
│           └── vl53l0x/             # Distance sensor driver
│
├── docs/                         # Documentation
│   ├── electronics/                 # Electronics documentation
│   ├── images/                      # Project images & photos
│   ├── induction-cooker/            # Induction cooker mod guide
│   ├── stepper-motor-driver/        # TMC2130 wiring diagrams
│   └── web-dashboard/               # Web dashboard documentation
│
├── models/                       # 3D Models
│
└── reports/                      # Data & Analysis
    ├── brew-time/                   # Brew time analysis
    │   ├── graph_maker.py
    │   ├── data/
    │   └── graphs/
    ├── heat-dissipation/            # Heat dissipation analysis
    │   ├── graph_maker.py
    │   ├── data/
    │   └── graphs/
    └── ir-thermometer/              # IR thermometer calibration
        ├── graph_maker.py
        ├── data/
        └── graphs/

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Documentation

Hardware setup guides are available in the docs/ folder:

• Induction Cooker Modification - Optocoupler wiring and connector setup
• TMC2130 Stepper Driver - SPI configuration and wiring diagrams
• Web Dashboard - Remote control interface and API reference
• UI Documentation - LVGL UI structure and customization

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