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Smart Dustbin

The Challenge

Waste management remains a persistent challenge in rapidly urbanizing regions. Traditional systems fail to segregate waste efficiently, leading to environmental pollution, inefficient recycling, and health hazards. Overflowing bins and unsegregated garbage contribute to mosquito breeding, air contamination, and ecosystem damage.


Develop an affordable, sensor-based smart dustbin that automates waste segregation at the source.


The Vision

The Smart Dustbin project aimed to build an intelligent, low-cost system to classify waste into wet, dry, and metal categories using commonly available sensors and microcontrollers. This project supports India's broader mission toward smart cities and sustainable environmental practices by reducing manual labor and improving segregation accuracy.

System Architecture

The Smart Dustbin integrates sensors and actuators for seamless waste classification:

Automated Waste Segregation

  • Moisture Sensor identifies wet waste like food or organic material

  • Metal Detector Coil + Electromagnet isolates metal components

  • Air Blower separates light dry waste (paper, plastic) via airflow

  • Waste is sorted onto a conveyor belt and directed to the appropriate bin

Environmental Monitoring

  • DHT11 Sensor measures temperature and humidity

  • MQ-135 Gas Sensor detects harmful gases (ammonia, CO₂, smoke)

  • Bluetooth Module (HC-05) communicates with the Blynk mobile app for remote monitoring

  • Arduino Uno handles sensor inputs and actuator control logic

System Logic

  • Metal waste is detected first and pulled aside using an electromagnet

  • Dry waste is identified using airflow after metal is removed

  • Wet waste is detected by moisture sensing and dropped into a separate bin

  • Data such as temperature, humidity, and gas levels are pushed to the Blynk app in real time

  • If toxic levels or temperature thresholds are exceeded, alerts are triggered on the mobile dashboard

Software & Code Features

  • Arduino code enables continuous monitoring of gas and metal frequency via sensors

  • Threshold values for toxic gases and metal presence can be set and updated via the Blynk app

  • EEPROM memory stores custom calibration offsets for more accurate detection

  • Dual monitoring using serial print and Bluetooth ensures robust operation during testing

Results

  • The smart dustbin successfully segregated metal, dry, and wet waste

  • Electromagnetic sorting proved effective for ferrous metals

  • Remote updates and live environmental data were accessible via mobile

  • Demonstrated potential for integration into industrial and public sector waste systems

Future Scope

  • Lid automation to prevent exposure to pests

  • Hydraulic compression to reduce waste volume

  • Bin fullness detection sensors with city-wide alert systems

  • Enhanced scrap value recovery for economic recycling

  • Potential smart integration with city sanitation dashboards

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