Download 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
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-2.4G Transceiver
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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
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
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)
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 …
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
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.
Existing Solutions
• Many RF Remote Control to control:
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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:
www.lantronix.com)
– Offers many perspectives
– No interference problems as it is the same
physical layer.