15-02-2013, 04:07 PM
PIR Motion Sensor Module
[attachment=51086]
INTRODUCTION
Compact and complete, easy to
use Pyroelectric Infrared (PIR)
Sensor Module for human body
detection. Incorporating a Fresnel
lens and motion detection circuit.
High sensitivity and low noise.
Output is a standard 5V active low
output signal.
Module provides an optimized
circuit that will detect motion up to
6 meters away and can be used in
burglar alarms and access control
systems. Inexpensive and easy to
use, it's ideal for alarm systems,
motion-activated lighting, holiday
props, and robotics applications.
The Output can be connected to microcontroller pin directly to monitor signal or a connected to
transistor to drive DC loads like a bell, buzzer, siren, relay, opto-coupler (e.g. PC817, MOC3021),
etc. The PIR sensor and Fresnel lens are fitted onto the the PCB. This enables the board to be
mounted inside a case with the detecting lens protruding outwards.
Features
· Complete with PIR, Motion Detection IC and Fresnel Lens
· Simple 3 connections
· Dual Element Sensor with Low Noise and High Sensitivity
· Supply Voltage: 5V DC
· Standard Active Low Output pin for connecting to microcontroller directly
· Detecting range up to 6 meters
· LED indication
· Module Dimensions: 25mm Length, 32mmWidth, 25mm Height
Theory of Operation
Pyroelectric devices, such as the PIR sensor, have elements made of a crystalline material that
generates an electric charge when exposed to infrared radiation. The changes in the amount of
infrared striking the element change the voltages generated, which are measured by an on-board
amplifier. The device contains a special filter called a Fresnel lens, which focuses the infrared
signals onto the element. As the ambient infrared signals change rapidly, the on-board amplifier
trips the output to indicate motion.
The PIR (Passive Infra-Red) Sensor is a pyroelectric device that detects motion by measuring
changes in the infrared (heat) levels emitted by surrounding objects. This motion can be detected by
checking for a sudden change in the surrounding IR patterns. When motion is detected the PIR
sensor outputs a high signal on its output pin. This logic signal can be read by a microcontroller or
used to drive a transistor to switch a higher current load.
Warm up time
The PIR Sensor requires a ‘warm-up’ time in order to function properly. This is due to the settling
time involved in ‘learning’ its environment. This could be anywhere from 1-2 Minutes. After this
warm up time, sensor will be ready to use.
[attachment=51086]
INTRODUCTION
Compact and complete, easy to
use Pyroelectric Infrared (PIR)
Sensor Module for human body
detection. Incorporating a Fresnel
lens and motion detection circuit.
High sensitivity and low noise.
Output is a standard 5V active low
output signal.
Module provides an optimized
circuit that will detect motion up to
6 meters away and can be used in
burglar alarms and access control
systems. Inexpensive and easy to
use, it's ideal for alarm systems,
motion-activated lighting, holiday
props, and robotics applications.
The Output can be connected to microcontroller pin directly to monitor signal or a connected to
transistor to drive DC loads like a bell, buzzer, siren, relay, opto-coupler (e.g. PC817, MOC3021),
etc. The PIR sensor and Fresnel lens are fitted onto the the PCB. This enables the board to be
mounted inside a case with the detecting lens protruding outwards.
Features
· Complete with PIR, Motion Detection IC and Fresnel Lens
· Simple 3 connections
· Dual Element Sensor with Low Noise and High Sensitivity
· Supply Voltage: 5V DC
· Standard Active Low Output pin for connecting to microcontroller directly
· Detecting range up to 6 meters
· LED indication
· Module Dimensions: 25mm Length, 32mmWidth, 25mm Height
Theory of Operation
Pyroelectric devices, such as the PIR sensor, have elements made of a crystalline material that
generates an electric charge when exposed to infrared radiation. The changes in the amount of
infrared striking the element change the voltages generated, which are measured by an on-board
amplifier. The device contains a special filter called a Fresnel lens, which focuses the infrared
signals onto the element. As the ambient infrared signals change rapidly, the on-board amplifier
trips the output to indicate motion.
The PIR (Passive Infra-Red) Sensor is a pyroelectric device that detects motion by measuring
changes in the infrared (heat) levels emitted by surrounding objects. This motion can be detected by
checking for a sudden change in the surrounding IR patterns. When motion is detected the PIR
sensor outputs a high signal on its output pin. This logic signal can be read by a microcontroller or
used to drive a transistor to switch a higher current load.
Warm up time
The PIR Sensor requires a ‘warm-up’ time in order to function properly. This is due to the settling
time involved in ‘learning’ its environment. This could be anywhere from 1-2 Minutes. After this
warm up time, sensor will be ready to use.