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 and Applications Principle of Operation Components Implementation Problems and Issues Existing similar solutions Perspectives

Context Motivations

In the House

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

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

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

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

Applications

TV and A/V Systems

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

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

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

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

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

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

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

Principle of Operation

Master: Remote Control Master: Remote Control

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

Features (Remote Control)

Color Graphic LCD screen

Expandable keypad Color Graphic LCD screen Expandable keypad Features (Remote Control)

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

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

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) 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)

Features (Slave Devices)

Two way communication

Features (Slave Devices) Two way communication Microcontroller (for intelligence) Two way communication Microcontroller (for intelligence)

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

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

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

Components - RF 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 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 TRF-2.4G Transceiver

Component - MP3 Player - MPEG audio layer 3 decoder (ISO ), 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 MHz or 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 V operating voltages for analog and digital Serial control and data interfaces MPEG audio layer 3 decoder (ISO ), 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 MHz or 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 V operating voltages for analog and digital Serial control and data interfaces

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) 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)

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 … 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

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

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.  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.

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. 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.

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