Two Way Remote Control Dr Abdelhafid Bouhraoua Outline

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 Ω load. 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.