Quick Answer:

An IR motion sensor for lighting control is a PIR (Passive Infrared) device that detects the heat signature of a moving person to trigger automatic lighting — no emission, no radiation, completely passive. Esysense offers IR sensors: standard PIR for room lighting, adjustable PIR for fine-tuned office and retail use, wall mount PIR for corridor entry detection, and active IR proximity sensor (ESY-M22) for cabinet and wardrobe door-state detection. For Indian summer conditions above 38 degrees C, microwave radar sensors are more reliable — but PIR remains practical and cost-effective for cooler and air-conditioned environments.

PIR (Passive IR) — Room Sensor

• Principle: Passive heat detection

• Detection: Area motion within a room

• Best Applications: Corridors, rooms, general lighting automation

• Link:esysense.com/collections/smart-sensors

Adjustable PIR Sensor

• Principle: Passive heat detection

• Detection: Area coverage with user-adjustable sensitivity and range

• Best Applications: Office cabins, retail stores, libraries

• Link:esysense.com/products/180-adjustable-pir-motion-sensor

Wall Mount PIR Sensor

• Principle: Passive heat detection

• Detection: Directed entry cone

• Best Applications: Corridors, doorways, staircase entrances

• Link:esysense.com/products/wall-mount-pir-sensor

IR Proximity Sensor (ESY-M22)

• Principle: Active IR reflective sensing

• Detection: Door proximity (approximately 5–6 cm)

• Best Applications: Cabinet and wardrobe door automation

• Link:esysense.com/products/single-door-cabinet-ir-sensor

Understanding the three distinct IR sensing approaches helps you choose the right product for each application — passive PIR for room area detection, active IR proximity for cabinet door detection, and active IR beam for staircase direction-aware triggering.

How IR Motion Detection Works — Three Different Technologies

Passive PIR (most common for room lighting): the human body emits infrared radiation continuously at 8-12 micrometer wavelength. A pyroelectric crystal inside the sensor generates a tiny electrical charge when the infrared pattern across its Fresnel lens detection zones changes — caused by a warm body moving from one zone to another. The signal triggers the relay output.

Active IR proximity (cabinet sensor ESY-M22): an IR LED emits a short-range beam. The reflected signal from the cabinet door is detected — when the door closes within 5-6 cm, reflection is strong (door closed, light OFF); when the door opens beyond 5-6 cm, reflection drops (door open, light ON).

Active IR beam (staircase sensor): IR transmitter emits a horizontal beam across the staircase width. IR receiver detects when the beam is physically broken by a person crossing. Direction is determined by which beam (top or bottom) breaks first — ascending vs descending — enabling sequential step activation from the correct end.

Bottom line:

The three IR technologies serve three different purposes: passive PIR for room occupancy area detection, active proximity for precise door-state sensing, and active beam for definitive crossing-point detection at staircase entries. Never substitute one for another — they are fundamentally different technologies.

Frequently Asked Questions

Q: What is the difference between an IR sensor and a PIR sensor?

A: PIR (Passive Infrared) is a specific sub-type of IR sensor — it passively detects changes in ambient infrared radiation from moving warm bodies. In Indian lighting control, 'IR sensor' and 'PIR sensor' are used interchangeably and both refer to the same passive heat-detection device.

Q: Can an IR cabinet sensor control a double-door wardrobe?

A: Use one ESY-M22 sensor per door — each operates independently. The light activates when either door opens and switches off only when both doors are fully closed.

People Also Ask

Q: What is an IR motion sensor used for?

A: Automatic lighting control (corridors, bathrooms, cabinets), security alarm triggering, staircase sequential lighting, and cabinet/wardrobe automatic illumination. Passive PIR for area motion detection; active IR beam for staircase crossing detection; active IR proximity for cabinet door-state control.

Conclusion

The Esysense IR sensor range covers every passive and active IR sensing need in Indian homes and commercial spaces — room PIR for lighting, adjustable PIR for offices, wall mount for corridors, IR proximity for cabinets, and IR beam for staircases. For summer-reliable year-round performance in unconditioned spaces, pair with or substitute microwave radar sensors. Browse the full range at esysense.com/collections/smart-sensors

Written from direct product testing and manufacturer specifications by Esysense Tech Innovations Pvt. Ltd., Ghaziabad, India. All prices, specs and model references are verified against live product listings at esysense.com. Last updated: June 2026