PIR sensors allow you to sense motion, almost always used to detect whether a human has moved in or out of the sensors range. They are small, inexpensive, low-power, easy to use and don't wear out. For that reason they are commonly found in appliances and gadgets used in homes or businesses. They are often referred to as PIR, "Passive Infrared", "Pyroelectric", or "IR motion" sensors.
Slight movement can be detectable
High immunity to external noise (vibration, etc.)
Custom design is available.
2.Working Conditions (T=25°C, Vdd=3V，Except other requirements)
Sensitivity threshold value
Output Low Current
Output High Current
Output Low current Lock time
Output High current Lock time
Oscillator & Filter
Low pass filter cut-off frequency
High pass filter cut-off frequency
Oscillator frequency on Chip
Wireless security sensors
Security alarm system
1.What can trigger a PIR sensor?
Five Causes of PIR False Alarms. The first cause of PIR false alarms is low or unstable voltage at the detector. Test to make sure the voltage at each PIR is above 13VDC and stable. The second cause of false alarms is sudden infrared movement / heat changes in view of the detector.
2.How do PIR sensors work?
When the sensor is idle, both slots detect the same amount of IR, the ambient amount radiated from the room or walls or outdoors. When a warm body like a human or animal passes by, it first intercepts one half of the PIR sensor, which causes a positive differential change between the two halves.