Daily application and maintenance of human infrared sensors(PIR sensors)

With the rapid development of technology, the application range of human infrared sensors (PIR sensors) is also constantly expanding. They are based on the characteristic that the human body can emit infrared radiation within a specific wavelength range, and achieve various functions by detecting changes in infrared radiation through corresponding sensors. Their applications are very extensive:

1. Daily applications

Human body infrared sensors (PIR sensors) are widely used in smart homes, security and alarm systems, and energy-saving home appliance control

A. Intelligent lighting

In intelligent lighting, human body infrared sensors (PIR sensors) are usually used in combination with small light bulbs. When someone is detected, the light bulb will illuminate, making life convenient, night time safe, and better protecting the elderly and children. For example, hallway/staircase lights; Wardrobe/cabinet lights; Courtyard/garage lights;

B. Security and alarm system

In the field of intelligent security, human infrared sensors (PIR sensors) are often combined with monitoring cameras and alarm systems to form an intelligent monitoring network. This type of network can effectively prevent intrusion and theft, enhance security, reduce manpower usage, and prevent accidental contact. For example, installed near doors and windows, detecting illegal intrusion and triggering alarms or notifying mobile phones; Cooperate with intelligent cameras to automatically record videos when abnormal movements are detected; Elderly/infant monitoring: Monitor activity status and send reminders when there is no movement for a long time (such as fall detection). Pet automatic feeding allows for timed feeding of animals and avoids food waste.

C. Energy saving home appliance control

In terms of energy-saving household appliances, human infrared sensors (PIR sensors) are commonly used in automatic control systems; Can effectively save electricity costs, reduce expenses, and extend the lifespan of electrical appliances. For example, automatic adjustment of air conditioning/fan: detects whether there is someone in the room, automatically adjusts to energy-saving mode or turns off when there is no one in the room; Smart toilet/faucet: It starts when it senses a person approaching and stops flowing water after leaving, saving water and hygiene; TV/computer sleep mode: automatically standby when no one is operating for a long time to avoid power consumption during standby.

D. Convenient living scenarios

In terms of convenient living, human infrared sensors (PIR sensors) are usually combined with smart homes to enhance the convenience of life and free up hands; For example, automatic doors/curtains: automatically open the door when walking in front of it, and close the curtains before going to bed by induction; Smart mirror: automatically lights up to display weather, schedule and other information when a person approaches; Toilet deodorizer: automatically open the exhaust or spray after detecting that someone is using it.

2. Daily maintenance

Human body infrared sensors (PIR sensors) usually have a long service life, non-contact detection, safety and reliability, and low cost. However, it is only sensitive to moving heat sources and may not be triggered by stationary human bodies. Prolonged use can easily reduce sensitivity and make it susceptible to interference from high-temperature objects. Regular maintenance can ensure its sensitivity, stability, and service life. Here are some maintenance methods:

A. Regular cleaning

Dust, oil stains, or spider webs may obstruct the lens and reduce detection sensitivity. Regularly wet the lens with a soft cloth or cotton swab to wipe it, and do not use hard objects; Stubborn stains can be purchased with specialized cleaning agents; It is also necessary to regularly check whether there are insects or debris blocking the sensing window.

B. Avoid environmental interference

High temperature, strong light, or airflow may cause false triggering or malfunction. Keep away from heat sources such as heaters, ovens, etc; Avoid facing the air conditioner/fan directly: Airflow may cause temperature fluctuations and false alarms; Adjust installation position: Avoid approaching glass windows (which may reflect infrared radiation); Install protective covers or sealing materials to isolate pollutants in dust, smoke, or high humidity environments.

C. Check the power supply and wiring

Battery depletion or circuit aging can cause sensor failure. Regular inspections are required to ensure no looseness, breakage, or corrosion. Battery powered devices require regular battery replacement, as low battery levels can affect sensitivity; Regularly check whether the power supply line is loose or oxidized, and replace the wires if necessary.

D. Testing and Calibration Sensitivity

Sensitivity decreases and detection distance shortens after long-term use. Regularly move your hand in front of the sensor to test if the trigger is working properly. Adjust the sensitivity knob according to the instruction manual; Sometimes default settings can be restored by shutting down and restarting.

E. Long term storage recommendations

It needs to be stored in a dry and dark place. If conditions permit, it can be wrapped in anti-static bags. Long term non use may damage electronic components and require shutdown for storage. For those with batteries, they need to be disassembled to avoid leakage and corrosion.