Introduction
Smart waste management systems need to know when bins are used and how full they are. PIR sensors can detect people approaching bins, indicating usage.
Applications in Waste Management
Usage Detection
Detect when someone approaches a bin to deposit trash. This provides data on bin usage patterns, helping optimize collection routes.
Bin Lid Automation
Trigger automatic opening of bin lid when person approaches.
Vandalism Prevention
Detect unusual activity around bins (e.g., rummaging, tipping).
Sensor Placement
- On bin front: Detect approaching person.
- Inside lid: Detect hand entering bin.
- On pole near bin: For outdoor bins, mounted to cover approach area.
Integration with Fill-Level Sensors
Many smart bins also use ultrasonic or radar sensors to measure fill level. Combining with PIR gives a complete picture: when was trash deposited, and how full is the bin.
Case Study: Smart City Pilot
A city installed PIR sensors on public trash bins. The data showed which bins were heavily used and which were underutilized. Collection routes were optimized, saving 30% on fuel costs.
Challenges
- Outdoor environment: Weatherproofing required.
- False triggers: People walking past without using bin.
- Power: Battery-powered with solar option.
- Vandalism: Sensors must be tamper-resistant.
Conclusion
PIR sensors add intelligence to waste management, providing usage data that enables efficient operations.