Smart parking systems need to know whether a parking space is occupied. While inductive loop detectors and ultrasonic sensors are common, PIR sensors offer a low-cost alternative for detecting vehicles.<\/p>\n
Vehicles, especially after being driven, are warm. The engine, exhaust, and even tires radiate heat. A PIR sensor above or beside a parking space can detect the presence of a warm vehicle.<\/p>\n
Limitation:<\/strong> A cold vehicle (parked for hours) may not be detectable. This limits PIR to detecting recent arrival, not long-term occupancy.<\/p>\n PIR sensors at garage entrances and exits can count vehicles entering and leaving, providing real-time occupancy counts.<\/p>\n In short-term parking (e.g., supermarket), PIR can detect if a space is occupied by a recently arrived vehicle.<\/p>\n Detect unauthorized movement in parking areas after hours.<\/p>\n A vehicle parked for hours may be at ambient temperature and invisible to PIR. Solution: Use in conjunction with other sensors (ultrasonic, magnetic) for reliable occupancy detection.<\/p>\n PIR cannot distinguish between a vehicle and a person standing in the space. May cause false occupancy readings.<\/p>\n A robust parking sensor often combines:<\/p>\n A shopping mall installed PIR sensors above each space in the short-term parking area. The system displayed available spaces on digital signs. Accuracy was 85% for recently parked vehicles but dropped to 60% for vehicles parked >2 hours. Adding ultrasonic sensors improved accuracy to 95%.<\/p>\n PIR sensors can be used in parking systems, but they work best for detecting recent arrivals and should be combined with other technologies for reliable long-term occupancy detection.<\/p>\n","protected":false},"excerpt":{"rendered":" Introduction Smart parking systems need to know whether a parking space is occupied. While inductive loop detectors and ultrasonic sensors are common, PIR sensors offer a low-cost alternative for detecting vehicles. How PIR Detects Vehicles Vehicles, especially after being driven, are warm. The engine, exhaust, and even tires radiate heat. A PIR sensor above or […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-4089","post","type-post","status-publish","format-standard","hentry","category-reference"],"blocksy_meta":[],"yoast_head":"\r\nApplications<\/h2>\n
Entry\/Exit Counting<\/h3>\n
Space Occupancy (Short-term)<\/h3>\n
Security<\/h3>\n
Sensor Placement<\/h2>\n
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Challenges<\/h2>\n
Cold Vehicles<\/h3>\n
Environmental Factors<\/h3>\n
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Differentiation<\/h3>\n
Dual-Technology Approach<\/h2>\n
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Case Study: Shopping Mall Parking<\/h2>\n
Conclusion<\/h2>\n