WIRELESSCommunication

Automation

Control

Wireless = EfficiencyWireless = Efficiency

• Performance:Performance:– Space Efficiency: Space Efficiency: Efficiency. = #receptors / box areaEfficiency. = #receptors / box area– Unlimited Number of Receptors.Unlimited Number of Receptors.– Minimal Wear and Tear. Minimal Wear and Tear.

• Environmental: Environmental: – Pollution (replacement cables)Pollution (replacement cables)– Safety (dangling wires)Safety (dangling wires)– Cosmetically AppealingCosmetically Appealing

• Marketable:Marketable:– Up to dateUp to date technology technology– User-Friendly (no physical connections)User-Friendly (no physical connections)– Consumer needs and wantsConsumer needs and wants

Bluetooth, IR and RFBluetooth, IR and RF• Bluetooth:Bluetooth:

PDAs, mobile PDAs, mobile phones, phones, computers, and computers, and electronic electronic devices. devices.

• Infra-RedInfra-Red (IR): (IR): TTelevision, elevision, automotive and automotive and other remote other remote control control applications.applications.

• Radio Radio FrequencyFrequency (RF): (RF): IIn home n home communication communication devices such as devices such as cordless phones, cordless phones, baby monitors baby monitors and walky-and walky-talkies. talkies.

• Decision:Decision: RF!!RF!!

Bluetooth Bluetooth disadvantagesdisadvantages

IRIR disadvantagesdisadvantages

RF RF advantagesadvantages

Data rate (Data rate (Up to Up to 723Kbps )723Kbps )..One operating One operating frequency frequency (2.4Ghz)(2.4Ghz)New device. New device. Interference with Interference with other wireless other wireless electronics.electronics.Weak signal Weak signal (1mV).(1mV).short distance of short distance of (10m).(10m).Price (over 100$)Price (over 100$)

Line of sight Line of sight Not as portable Not as portable as RF.as RF.Affected by Affected by sunlight sunlight ((saturation of saturation of the receiver the receiver photo diode)photo diode)One device at One device at a time. a time. More More expensive. expensive. (higher cost per (higher cost per square ft than square ft than RF)RF)

Higher data Higher data rate (up to rate (up to 2.4Ghz)2.4Ghz)Lower Lower coverage costcoverage costMultiple Multiple channelschannelsUnlimited # of Unlimited # of receiversreceiversInterference is Interference is avoidable. avoidable. No need for No need for line of sight.line of sight.Outside use.Outside use.

RF SpecificationsRF Specifications• COMPONENTSCOMPONENTS

– Encoder (HT 640) and Decoder (HT 648) Chips:Encoder (HT 640) and Decoder (HT 648) Chips:• Word (8 bits) or Bit Sequence Word (8 bits) or Bit Sequence Separate Output Signal Bits Separate Output Signal Bits • Oscillation (390 Kohms) Oscillation (390 Kohms)

– Transmitter and Receiver ModulesTransmitter and Receiver Modules• Output Power (14 to 16 dB)Output Power (14 to 16 dB)• Operating Frequency (433.9Mhz)Operating Frequency (433.9Mhz)• Modulation (AM)Modulation (AM)• Data Rate (2.4Kbps)Data Rate (2.4Kbps)

– Whip AntennasWhip Antennas• Provide maximum operating distances. Provide maximum operating distances.

• POTENTIAL INTERFERENCESPOTENTIAL INTERFERENCES– Cordless Phones:Cordless Phones: Regulated at 900Mhz (FCC) Baby Monitors Regulated at 900Mhz (FCC) Baby Monitors– Walky -TalkiesWalky -Talkies (no more than 2.3 - 30 Mhz) (no more than 2.3 - 30 Mhz)– Police RadarPolice Radar GunsGuns (10.5 – 36 Ghz) (10.5 – 36 Ghz)– Cell phonesCell phones (1800 – 1900 Mhz) (1800 – 1900 Mhz)– RadioRadio AM (0.5 – 1.5 Mhz), FM (88 – 108 Mhz) AM (0.5 – 1.5 Mhz), FM (88 – 108 Mhz)– TVTV ( (C.2-6: 55 - 88 MHz, C.7-13: 175 - 215 MHz, C.18-83: 471 - 890 MHz)C.2-6: 55 - 88 MHz, C.7-13: 175 - 215 MHz, C.18-83: 471 - 890 MHz)– BluetoothBluetooth and and MicroWaveMicroWave Ovens (2.4 Mhz) Ovens (2.4 Mhz)

How it worksHow it works

1.1.Outside Connection (red):Outside Connection (red): Cell phone Cell phone BS, MS BS, MS Home (Control Home (Control Box)Box)

2.2. Inside Transmission (blue): Inside Transmission (blue): Code (touchtone pad) Code (touchtone pad) Bit Sequence Bit Sequence (encoder) (encoder) Tx Tx

3.3. Inside Reception: Inside Reception: Reception Reception Output Bits (decoder) Output Bits (decoder) Relay Relay

4.4.Result:Result: If TxCode == ChCode; Turn ON or If TxCode == ChCode; Turn ON or OFF.OFF.

Future PossibilitiesFuture PossibilitiesTHE POSSIBILITIES ARE ENDLESS!!!THE POSSIBILITIES ARE ENDLESS!!!

• Longer Bit SequenceLonger Bit Sequence– More Bits Means More InformationMore Bits Means More Information

• Start/Stop Time DelayStart/Stop Time Delay• Functional Time IntervalsFunctional Time Intervals• Multiple Channel ManipulationMultiple Channel Manipulation• Appliance Functional Level ControlAppliance Functional Level Control

• Use of InternetUse of Internet– Alternative AccessibilityAlternative Accessibility

• PDA’sPDA’s• CPU’s (Office, Laptops, etc.)CPU’s (Office, Laptops, etc.)• Cell Phone MessagingCell Phone Messaging

• Continuous MonitoringContinuous Monitoring– 2Way RF Communication For Feedback2Way RF Communication For Feedback

• State of OperationState of Operation• Safety Information (overheat, fire alarm, security alarm)Safety Information (overheat, fire alarm, security alarm)