Two Way Remote Control

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Two Way Remote Control

• Dr. Abdelhafid Bouhraoua

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Outline

• Context, Motivations and Applications
• Principle of Operation
• Components
• Implementation
• Problems and Issues
• Existing similar solutions
• Perspectives

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Context Motivations
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Context Motivations
In the House
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Context Motivations
In the House

• Many Devices in the House can be controlled
  Remotely

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Context Motivations
In the House

• Many Devices in the House can be controlled
  Remotely
• Each Device has own Control Protocol

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Context Motivations
In the House

• Many Devices in the House can be controlled
  Remotely
• Each Device has own Control Protocol
• All Devices can be Electrically Controlled

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Context Motivations
In the House

• Many Devices in the House can be controlled
  Remotely
• Each Device has own Control Protocol
• All Devices can be Electrically Controlled

RF Remote Control
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Applications
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Applications

• TV and A/V Systems

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Applications

• TV and A/V Systems
• Check Programs, Kids Watching, Control VCR (DVR
  or DVD), etc

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Applications

• TV and A/V Systems
• Check Programs, Kids Watching, Control VCR (DVR
  or DVD), etc
• Computer

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Applications

• TV and A/V Systems
• Check Programs, Kids Watching, Control VCR (DVR
  or DVD), etc
• Computer
• Email Not., Messenger, Audio, Video, etc

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Applications

• TV and A/V Systems
• Check Programs, Kids Watching, Control VCR (DVR
  or DVD), etc
• Computer
• Email Not., Messenger, Audio, Video, etc
• Appliances

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Applications

• TV and A/V Systems
• Check Programs, Kids Watching, Control VCR (DVR
  or DVD), etc
• Computer
• Email Not., Messenger, Audio, Video, etc
• Appliances
• Temperature Mon., Status of Appliances, etc

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Applications

• TV and A/V Systems
• Check Programs, Kids Watching, Control VCR (DVR
  or DVD), etc
• Computer
• Email Not., Messenger, Audio, Video, etc
• Appliances
• Temperature Mon., Status of Appliances, etc
• Safety

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Applications

• TV and A/V Systems
• Check Programs, Kids Watching, Control VCR (DVR
  or DVD), etc
• Computer
• Email Not., Messenger, Audio, Video, etc
• Appliances
• Temperature Mon., Status of Appliances, etc
• Safety
• Alarm, Smoke, Water or Gas Leakage, etc

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Principle of Operation
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Principle of Operation

• Master
• Remote Control

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Principle of Operation
Slaves Command Devices

• Master
• Remote Control

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Features (Remote Control)
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Features (Remote Control)

• Color Graphic LCD screen

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Features (Remote Control)

• Color Graphic LCD screen
• Expandable keypad

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Features (Remote Control)

• Color Graphic LCD screen
• Expandable keypad
• Two-way high bit rate communication

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Features (Remote Control)

• Color Graphic LCD screen
• Expandable keypad
• Two-way high bit rate communication
• Relatively large memory to store the software

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Features (Remote Control)

• Color Graphic LCD screen
• Expandable keypad
• Two-way high bit rate communication
• Relatively large memory to store the software
• Variety of extra interfaces like USB and Infrared
  (for TV/VCR/DVD control)

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Features (Slave Devices)
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Features (Slave Devices)

• Two way communication

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Features (Slave Devices)

• Two way communication
• Microcontroller (for intelligence)

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Features (Slave Devices)

• Two way communication
• Microcontroller (for intelligence)
• Many standard and custom interfaces (to control
  to the devices)

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Features (Slave Devices)

• Two way communication
• Microcontroller (for intelligence)
• Many standard and custom interfaces (to control
  to the devices)
• USB (for the Computer Slave Device)

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Components- LCD Display -

• Nokia 6610 Color LCD

• Graphic LCD
• Serial Interface
• Available Connector

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Components- RF Transceiver -
TRF-2.4G Transceiver

• Frequency Range 2.42.524 GHz ISM band
• Modulate Mode GFSK
• Data Rate 1Mbps or 250Kbps
• Multi channel operation 125 channels, Channel
  switching timelt200uS, Support frequency hopping
• Emulated full duplex RF link due to the 1Mbits/s
  on the air data rate
• Including decoder, encoder and data buffer and
  CRC computation
• Burst mode for ultra-low power operation and
  relaxed MCU performance
• Sensitivity -90dBm
• Built in antenna
• Power supply range 1.9 to 3.6 V
• Size 20.536.52.4mm

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Component- MP3 Player -

• MPEG audio layer 3 decoder (ISO11172-3), MPEG 1
  2, and 2.5 extensions, all their sample rates and
  bit rates, in mono and stereo
• Can be used as a slave co-processor
• Operates with single clock 12..13 MHz or 24..26
  MHz
• Low-power operation
• On-chip high-quality stereo DAC with no phase
  error between channels
• Internal Op-Amp in BGA-49 and LQFP-48 packages
• Stereo earphone driver capable of driving a 30?
  load.
• Separate 2.5 .. 3.6V operating voltages for
  analog and digital
• Serial control and data interfaces

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Component- MP3 Player Board -

• Board Based on VS1001 chip
• Simple board with all external passive components
  and voltage regulator for providing voltage to
  analog and digital parts of the chip.
• Conform to VS1001 Datasheet
• Designed and Manufactured by JELU (Sweden)

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Component- Microcontroller -
Rabbit Semiconductor RCM3700 Microprocessor Core

• 512K SRAM
• 512K Flash
• Ethernet for Networked Applications including
  web-enabled embedded apps.
• Many standard interfaces
• USART, SPI, I2C, SCI, Parallel Ports
• Many Timers for clock generation and PWM
• Provided Development Environment
• Standard ANSI-C language programming environment
• Many libraries spanning as wide as
• PWM, SPI, USART, GPS, Timer Control, TCP/IP, etc

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Implementation

• No Board was Developed because of Time constraints

• RCM3700 Successfully Interfaced with VS1001 MP3
  Board
• MP3 File playback successful
• RCM3700 Successfully interfaced with TRF-2.4G
  Transceiver
• Simple Messages exchanged successfully

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Problems and Issues

• Student involvement. Project proposed only
  because of a strong student interest and
  commitment. However, interest did not materialize
  over time.
• Malfunction in the MP3 player board ordered from
  the Jelu website. The board is built around a
  single chip the VS1001. It took a large amount
  of debugging and troubleshooting time from us to
  arrive to this conclusion. Valuable help of Mr.
  Victorioso M. Go (Dong Jr.) who removed the
  74LV245 from the board and solder directly bypass
  wires on the VS1001.
• Socket for the TRF2.4G connector. This connector
  is a two-row, 10 post, 1.27 mm header. Again, Mr.
  Victorioso M. Go was the one who solved this
  logistical issue by making custom boards that
  converts the connectors to standard 2.54 mm
  headers.
• Interference in the 2.4Ghz band. TRF2.4Gs could
  not communicate properly. WLAN coverage in
  building 22 was the problem. An experiment where
  I turn off the transmitter and work only with the
  receiver shows that
• Garbage Data is received as a result of the WLAN
  interferences even when an 8-bits CRC is enabled.
• The frequency of received garbage decreases
  dramatically but not totally when 16-bits CRC is
  turned on.

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Existing Solutions

• Many RF Remote Control to control
• TV and some Home Appliances and the PC
• No Product customizable Yet
• No Product with video streaming to the remote
• No Two-way communication
• New standard for low bitrate communications
  Zigbee Consortium.
• Bit rate either 40 Kbps or 250 Kbps enough for
  the application we were targeting
• Many companies involved
• WLAN Remote Control
• No Product found.

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Perspectives

• Use a Wireless LAN (WLAN) to carry the remote
  control signals
• Many embedded WLAN NICs available (WiPort from
  Lantronix www.lantronix.com)
• Offers many perspectives
• No interference problems as it is the same
  physical layer.