Two Way Remote Control Dr Abdelhafid Bouhraoua

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 In the House • Many Devices in the House can be controlled Remotely

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

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

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

Applications

Applications • TV and A/V Systems

Applications • 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

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

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

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…

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

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…

Principle of Operation

Principle of Operation Master: Remote Control

Principle of Operation Master: Remote Control Slaves: Command Devices

Features (Remote Control)

Features (Remote Control) • Color Graphic LCD screen

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

Features (Remote Control) • 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

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)

Features (Slave Devices)

Features (Slave Devices) • Two way communication

Features (Slave Devices) • 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)

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)

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

Components - RF Transceiver TRF-2. 4 G Transceiver • • • Frequency Range: 2. 4~2. 524 GHz ISM band Modulate Mode: GFSK Data Rate: 1 Mbps or 250 Kbps Multi channel operation: 125 channels, Channel switching time<200 u. S, Support frequency hopping Emulated full duplex RF link due to the 1 Mbits/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: -90 d. Bm Built in antenna Power supply range: 1. 9 to 3. 6 V Size: 20. 5*36. 5*2. 4 mm

Component - MP 3 Player • MPEG audio layer 3 decoder (ISO 11172 -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. Ω • Separate 2. 5. . 3. 6 V operating voltages for analog and digital • Serial control and data interfaces

Component - MP 3 Player Board • Board Based on VS 1001 chip • Simple board with all external passive components and voltage regulator for providing voltage to analog and digital parts of the chip. • Conform to VS 1001 Datasheet • Designed and Manufactured by JELU (Sweden)

Component - Microcontroller Rabbit Semiconductor RCM 3700 Microprocessor Core • 512 K SRAM • 512 K Flash • Ethernet for Networked Applications including web-enabled embedded apps. • Many standard interfaces: – USART, SPI, I 2 C, 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 …

Implementation No Board was Developed because of Time constraints • RCM 3700 Successfully Interfaced with VS 1001 MP 3 Board – MP 3 File playback successful • RCM 3700 Successfully interfaced with TRF-2. 4 G 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 MP 3 player board ordered from the Jelu website. The board is built around a single chip: the VS 1001. 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 74 LV 245 from the board and solder directly bypass wires on the VS 1001. Socket for the TRF 2. 4 G 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. 4 Ghz band. TRF 2. 4 Gs 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.

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