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Two Way Remote Control

Two Way Remote Control. Dr. Abdelhafid Bouhraoua. Outline. Context, Motivations and Applications Principle of Operation Components Implementation Problems and Issues Existing similar solutions Perspectives. Context Motivations. Context Motivations. In the House. Context Motivations.

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Two Way Remote Control

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  1. Two Way Remote Control Dr. Abdelhafid Bouhraoua

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

  3. Context Motivations

  4. Context Motivations In the House

  5. Context Motivations • Many Devices in the House can be controlled Remotely In the House

  6. Context Motivations • Many Devices in the House can be controlled Remotely • Each Device has own Control Protocol In the House

  7. Context Motivations • Many Devices in the House can be controlled Remotely • Each Device has own Control Protocol • All Devices can be Electrically Controlled In the House

  8. Context Motivations • Many Devices in the House can be controlled Remotely • Each Device has own Control Protocol • All Devices can be Electrically Controlled In the House RF Remote Control

  9. Applications

  10. Applications • TV and A/V Systems

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

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

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

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

  15. 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…

  16. 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

  17. 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…

  18. Principle of Operation

  19. Principle of Operation Master: Remote Control

  20. Principle of Operation Master: Remote Control Slaves: Command Devices

  21. Features (Remote Control)

  22. Features (Remote Control) • Color Graphic LCD screen

  23. Features (Remote Control) • Color Graphic LCD screen • Expandable keypad

  24. Features (Remote Control) • Color Graphic LCD screen • Expandable keypad • Two-way high bit rate communication

  25. Features (Remote Control) • Color Graphic LCD screen • Expandable keypad • Two-way high bit rate communication • Relatively large memory to store the software

  26. 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)

  27. Features (Slave Devices)

  28. Features (Slave Devices) • Two way communication

  29. Features (Slave Devices) • Two way communication • Microcontroller (for intelligence)

  30. Features (Slave Devices) • Two way communication • Microcontroller (for intelligence) • Many standard and custom interfaces (to control to the devices)

  31. 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)

  32. Components- LCD Display - • Graphic LCD • Serial Interface • Available Connector Nokia 6610 Color LCD

  33. Components- RF Transceiver - TRF-2.4G Transceiver • Frequency Range: 2.4~2.524 GHz ISM band • Modulate Mode: GFSK • Data Rate: 1Mbps or 250Kbps • Multi channel operation: 125 channels, Channel switching time<200uS, 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: 20.5*36.5*2.4mm

  34. 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 30­Ω load. • Separate 2.5 .. 3.6V operating voltages for analog and digital • Serial control and data interfaces

  35. 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)

  36. Component- Microcontroller - • 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 … Rabbit Semiconductor RCM3700 Microprocessor Core

  37. 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

  38. 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.

  39. 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.

  40. 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.

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