PIR Sensor - Human Body detecting module Pyroelectric HC-SR501
HC-SR501 PIR Sensor detects motion by measuring changes in the infrared (heat) levels emitted by surrounding objects. When motion is detected the PIR sensor outputs a high signal on its output pin.
HC-SR501 PIR Sensor has an adjustable delay before firing and adjustable sensitivity. Runs on 4.5-20V, Digital signal output is High 3.3 V / Low 0V. Sensing range is about 7 meters (100 degree cone). Turning potentiometer clockwise increases sensing range (about 7 meters), on the contrary, sensing range decreases (about 3 meters).
Features:
1. Automatic induction: When someone enters its induction range, enter the high level, people leave the sensor range is automatically delayed off high. Output low.
2. photosensitive control (optional): the module reserved for location, can be set to photosensitive control, strong light during the day or not induction. Photosensitive control is optional, the factory did not install photosensitive resistor. If
necessary, please buy a separate photosensitive resistor to install.
3. Two trigger modes: L is not repeatable, H is repeatable. Can be jumper selected, the default is H.
A. non-repeatable trigger mode: the induction output high, the delay time is over, the output will automatically change from high to low.
B. Repeated trigger mode: that is, after sensing the output high, in the delay time period, if the human body in its sensing range of activities, its output will remain high until the delay after the person will leave the high The level changes to low level (the sensing module automatically delays a delay time after every activity of the human body, and takes the time of the last activity as the starting point of the delay time).
4. Induction blocking time (default setting: 3-4 seconds): After each sensing output (high level goes low), the sensing module can be followed by a blocking time, during which it is sensed The device does not receive any sense signals. This function can be used to achieve the interval between the sensing output time and the blocking time. It can be applied to the interval detection products. At the same time, this function can effectively suppress all kinds of interference in the process of load switching.
5. Wide operating voltage range: the default operating voltage DC5V to 20V
6. Micro-power: Quiescent current 65 microamps, especially for dry battery-powered electrical products.
7. Output high-level signal: can be easily with various types of circuits to achieve docking.
HC-SR501 PIR Sensor - Technical Specifications
Product Type: HC--SR501 Body Sensor Module
Input voltage: DC 4.5-20V
Static Current: <50uA
Level output: High 3.3 V / Low 0V
Trigger: L cannot be repeated trigger / H can be repeated trigger
Delay time: 5-200s
Block time: 2.5s
Board Dimensions: 32mm*24mm
Angle Sensor: <100 cone angle
Operation Temp: -15-+70 degrees
Lens size sensor: Diameter: 23mm
Applications
- Security Products
- Motion sensor
- Switch
- Industrial automation and control, etc.
Resources:
1. How HC-SR501 PIR Sensor Works & Interface It With Arduino
2. Introduction to PIR Motion Module (HC-SR501)