Multi-Sensor IoT Safety Project Using ESP32

ESP32 Multi-Sensor IoT Home Protection System for Fire, Gas & Safety Automation

This advanced IoT Home Protection System is engineered around the powerful ESP32 WiFi + Bluetooth development board and designed for students, hobbyists, and innovators creating science fair or university final-year projects. Using a combination of flame detection (NHR0057), gas sensing (MQ-2), temperature monitoring (NTC module), and over-current protection (ACS712), this system provides real-time safety automation with smart notifications, audible alarms, and load-cutoff capability. To enhance user experience, warnings appear on both the 16x2 I2C LCD display and the Blynk IoT mobile app. This makes the project ideal for academic demonstration, practical engineering application, and R&D prototyping. Inspired by local innovation trends and frequently referenced in “Bigyan Project” or “বিজ্ঞান প্রজেক্ট” setups, this kit showcases modern IoT safety automation at an accessible level.

Product Specifications

Features

• Real-time fire detection using the NHR0057 flame sensor
• Gas leakage alert with automatic fan activation
• Temperature-based cooling system control
• Over-current protection with relay-based load cutoff
• Blynk IoT integration for mobile notification and monitoring
• LCD display for instant visual warnings
• Dual power regulation (5V & 3.3V) for stable performance
• Ideal for academic, engineering, and Bigyan Project uses
• Compact wiring with 22AWG cables
• Audible alarm through 5V active buzzer

Applications / Use Cases

• University final-year IoT safety project demonstrations
• Science fair "বিজ্ঞান প্রজেক্ট" presentations
• Home fire and gas detection prototypes
• Smart home automation experiments
• Industrial safety monitoring prototypes
• STEM and robotics-based learning

User Guide / How to Use

• Power the system using the dual 18650 battery pack and rocker switch
• Connect the ESP32 to your Blynk IoT account and WiFi network
• Set the current threshold through the 10kΩ potentiometer
• Monitor fire, gas, temperature, and current readings on the LCD
• Receive real-time warnings on the Blynk mobile app
• Relay automatically cuts off load during flame or excess current
• Fan automatically activates during high temperature or gas detection

Frequently Asked Questions (FAQs)

• Q: Does the system work without WiFi?
  A: Yes, local LCD warnings and buzzer alarms still function; Blynk alerts require WiFi.
• Q: Can I modify the sensors?
  A: Yes, the ESP32 easily supports additional sensors or replacements.
• Q: How is the current limit adjusted?
  A: Turn the 10kΩ potentiometer to set a safe current threshold for the load.
• Q: Can this be used as a “Bigyan Project” or science fair project?
  A: Absolutely; the system is designed for academic project demonstration.
• Q: What happens when flame is detected?
  A: Buzzer sounds, LCD shows warning, Blynk app alerts, and relay cuts off load if required.

Challenges and Considerations

• Ensure proper ventilation for the MQ-2 gas sensor
• Accurate calibration may be required for temperature and gas outputs
• Battery voltage should be monitored for stable ESP32 operation
• Proper relay isolation is important for safety
• Environmental lighting may affect flame sensor sensitivity

Compatibility

• Compatible with Blynk IoT platform
• Works with ESP32 Arduino IDE or PlatformIO
• Supports expansion with additional 3.3V or 5V modules
• Can integrate into smart home automation setups

Future Enhancement Options

• Adding SMS or WhatsApp notification systems
• Integration with Google Home or Alexa
• Adding PIR motion detection
• Creating a 3D-printed enclosure
• Including data logging and analytics

Benefits

• Provides multi-layer safety monitoring
• Excellent learning tool for IoT and automation
• Easy to explain in a science fair or Bigyan Project setup
• Portable dual-battery power system
• Highly customizable for advanced users

Conclusion

This ESP32-based IoT Home Safety System delivers a complete solution for fire detection, gas monitoring, temperature control, and electrical load protection. Whether used for a university final-year thesis, a “বিজ্ঞান প্রজেক্ট,” or a practical home-automation prototype, it offers strong performance with real-time smart alerts and dependable hardware control.

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