23-08-2012, 11:51 AM
MULTI SENSOR BASED SECURITY ROBOT USING ZIGBEE
MULTI SENSOR BASED SECURITY ROBOT USING ZIGBEE.ppt (Size: 241.5 KB / Downloads: 96)
AIM
The aim of our project is to design and develop an intelligence robot to detect dangerous Gas/Smoke by using an 8 bit microcontroller.
In our project the robot is designed to move automatically..
If particular Smoke is detected, robot will switch ON the Alarm Unit.
The video and audio are monitored at the control unit
SMOKE DETECTORS
A smoke detector is a device that detects smoke and issues an alarm.
There are two types of smoke detectors common to today’s normal household:
Ionization smoke detector.
Photoelectric smoke detector.
Ionization Smoke Detectors
An Ionization Smoke Detector has two key parts: the ionization chamber, and a source of radiation.
This source of radiation consists of a very minute concentration of Americium-241, which produce alpha particles.
The Ionization Chamber contains two plates: one plate is negatively charged, and the other is positively charged.
Photo electric smoke detector
It consists of a chamber in the shape of a capital letter "T." The horizontal portion of this chamber consists of a light source called a Light Emitting Code.
This beam of light travels across this horizontal bar, but never sends light vertically.
DC MOTOR
A DC motor is designed to run on DC electric power.
The most common DC motor types are the brushed and brushless types, which use internal and external commutation respectively to create an oscillating AC current from the DC.
H-BRIDGE
The L293 and L293D are quadruple high-current half-H drivers.
The L293 is designed to provide bidirectional drive currents of up to 1 A at voltages from 4.5 V to 36 V.
The L293D is designed to provide bidirectional drive currents of up to 600-mA at voltages from 4.5 V to 36 V
ZIGBEE
ZigBee is the name of a specification for a suite of high level communication protocols using small, low-power digital radios based on the IEEE 802.15.4-2006 standard for wireless personal area networks (WPANs).
ZigBee is targeted at radio-frequency (RF) applications that require a low data rate, long battery life, and secure networking.
There are four different types of ZigBee devices:
Zigbee coordinator
Zigbee router
Zigbee end device
Zigbee device object
protocols
The ZigBee protocols support beacon and non-beacon enabled networks.
In non-beacon-enabled networks (those whose beacon order is 15), an unslotted CSMA/CA channel access mechanism is used.
In beacon-enabled networks, the special network nodes called ZigBee Routers transmit periodic beacons to confirm their presence to other network nodes.