WIRELESS Communication Automation Control

Wireless = Efficiency Performance: Performance: –Space Efficiency: Efficiency. = #receptors / box area –Unlimited Number of Receptors. –Minimal Wear and Tear. Environmental: Environmental: –Pollution (replacement cables) –Safety (dangling wires) –Cosmetically Appealing Marketable: Marketable: –Up to date technology –User-Friendly (no physical connections) –Consumer needs and wants

Bluetooth, IR and RF Bluetooth: PDAs, mobile phones, computers, and electronic devices. Bluetooth: PDAs, mobile phones, computers, and electronic devices. Infra-Red (IR): Television, automotive and other remote control applications. Infra-Red (IR): Television, automotive and other remote control applications. Radio Frequency (RF): In home communication devices such as cordless phones, baby monitors and walky-talkies. Radio Frequency (RF): In home communication devices such as cordless phones, baby monitors and walky-talkies. Decision: RF!! Decision: RF!! Bluetooth disadvantages IR disadvantages disadvantagesRFadvantages  Data rate ( Up to 723Kbps ).  One operating frequency (2.4Ghz)  New device.  Interference with other wireless electronics.  Weak signal (1mV).  short distance of (10m).  Price (over 100$)  Line of sight  Not as portable as RF.  Affected by sunlight ( saturation of the receiver photo diode)  One device at a time.  More expensive. (higher cost per square ft than RF)  Higher data rate (up to 2.4Ghz)  Lower coverage cost  Multiple channels  Unlimited # of receivers  Interference is avoidable.  No need for line of sight.  Outside use.

RF Specifications COMPONENTS COMPONENTS –Encoder (HT 640) and Decoder (HT 648) Chips: Word (8 bits) or Bit Sequence  Separate Output Signal Bits Word (8 bits) or Bit Sequence  Separate Output Signal Bits Oscillation (390 Kohms) Oscillation (390 Kohms) –Transmitter 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 Antennas Provide maximum operating distances. Provide maximum operating distances. POTENTIAL INTERFERENCES POTENTIAL INTERFERENCES –Cordless Phones: Regulated at 900Mhz (FCC) Baby Monitors –Walky -Talkies (no more than Mhz) –Police Radar Guns (10.5 – 36 Ghz) –Cell phones (1800 – 1900 Mhz) –Radio AM (0.5 – 1.5 Mhz), FM (88 – 108 Mhz) –TV (C.2-6: MHz, C.7-13: MHz, C.18-83: MHz) –Bluetooth and MicroWave Ovens (2.4 Mhz)

How it works 1. Outside Connection (red): Cell phone  BS, MS  Home (Control Box) 2. Inside Transmission (blue): Code (touchtone pad)  Bit Sequence (encoder)  Tx 3. Inside Reception: Reception  Output Bits (decoder)  Relay 4. Result: If TxCode == ChCode; Turn ON or OFF.

Future Possibilities THE POSSIBILITIES ARE ENDLESS!!! Longer Bit Sequence Longer Bit Sequence –More Bits Means More Information Start/Stop Time Delay Start/Stop Time Delay Functional Time Intervals Functional Time Intervals Multiple Channel Manipulation Multiple Channel Manipulation Appliance Functional Level Control Appliance Functional Level Control Use of Internet Use of Internet –Alternative Accessibility PDA’s PDA’s CPU’s (Office, Laptops, etc.) CPU’s (Office, Laptops, etc.) Cell Phone Messaging Cell Phone Messaging Continuous Monitoring Continuous Monitoring –2Way RF Communication For Feedback State of Operation State of Operation Safety Information (overheat, fire alarm, security alarm) Safety Information (overheat, fire alarm, security alarm)