Home Monitoring with Wireless Sensor Networks

Jesse Phelps – Senior Developer, LashBack

Agenda

• ZigBee• XBee

– Basic Overview– Adapter

• Kill A Watt• Motion Detector (PIR)• XBee frame description• Other uses

Wireless Sensor Networks

ZigBee

• Personal Area Network• Built on IEEE 802.15.4• Adds authentication & encryption

ZigBee Stack

XBee

XBee Specs

• Power output: 1mW• Indoor/Urban range: Up to 100ft (Pro 300ft)• Outdoor/LOS range: Up to 300ft (Pro 1mi)• RF data rate: 250kbps• Operating frequency: 2.4 GHz

XBee Adapter

Adapter Pinout

Wireless Kill A Watt

Parts Kit

Schematic

Assembled Kit

Assembled Kit

Assembled Kill A Watt

Assembled Kill A Watt

Motion Detector

• Passive Infrared (PIR)• Pryoelectric Device• Detects change in the infrared profile

Pyroelectric Devices

• Voltage output with temperature changes– Temperature change modifies atom position– Changes polarization– Gives rise to voltage

Fresnal Lens

Frame Description

• 7E Start Delimiter• 00 0C Length Bytes• 83 API Identifier for 16bit DIO Data• 56 78 Source Address• 2E RSSI Value bytes• 00 Option byte• 02 Sample Quantity Byte

Frame Description continued

• 00 18 Channel Indicator– 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0

• 00 18 Sample Data (1 high, 0 low)• 36 Checksum

Other uses

• Wireless temperature sensor• .NET Micro

Links

• http://www.digi.com/• http://www.ladyada.net/• http://www.p3international.com/• http://www.devicesolutions.net/

Sponsors

Questions?

@jessephelpshttp://www.jessephelps.com/