Light Switch 3Pins Intelligent PIR Sensor HM312

Overview

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.

Feature

Slight movement can be detectable

High immunity to external noise (vibration, etc.)

Custom design is available.

Technical Data

1.Maximum Ratings

Characteristics	Symbol	My. Value	Max. Value	Unit	Remarks
Working Temperature	TST	-20	85	°C
Max.current	Into	-100	100	mA
Storage Temperature	TST	-40	125	°C

2.Working Conditions (T=25°C, Vdd=3V，Except other requirements)

Characteristics	Symbol	Min.	Type	Max.	Unit	Remarks
Supply Voltage	VDD	2.7	3	3.3	V	IR = 0.5mA
Working Current	IDD	9	12	15	μA
Sensitivity threshold value	VSENS		50		μV
Output REL
Output Low Current	IOL	10			mA	VOL<1V
Output High Current	JOHN			-10	mA	VOL>(VDD-1V
Output Low current Lock time	T OL		2.3		s	Non-adjustable
Output High current Lock time	T OH		2.3		s
Oscillator & Filter
Low pass filter cut-off frequency				7	Hz
High pass filter cut-off frequency				0.44	Hz
Oscillator frequency on Chip	FCLK			64	kHz

Application

Security Equipment

Wireless security sensors

Security cameras

Security alarm system

FAQ

1.What can trigger a low voltage 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 wide angle pir 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.

Senba is one of the most professional PIR sensor manufacturers for more than 15 years. We are the most advanced factory with complete categories. With strong R&D center, there are digital type and analog type, dual elements and four elements for you choose. The market cover domestic market, Korean, Amertica, Turkey and Europe.