Function: Detects the presence of nearby objects without physical contact.

Common Types:

• Infrared (IR) Proximity Sensors
• Ultrasonic Sensors
• Capacitive Sensors
• Inductive Sensors (for metallic objects)

Typical Applications:

• Smartphones (auto screen off during calls)
• Robotics (obstacle detection)
• Industrial automation
• Touchless switches

Key Parameters: Sensing distance, response time, output type (analog/digital), power supply.