sachinbhardwaj sofia project san-group tu/etozceleb/sofia/progress-report-sofia-12-may-09.pdf ·...
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Sachin bhardwaj
SOFIA Project
SAN-Group
TU/e
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Outlines� Light Control
� Introduction
� Equipment/Technology
� Phidget
� Introduction/ Light sensor
� Phidget Interface Kit 8/8/8
� Programming Languages
� Pros/Cons and Applications
� Discussion
� Future Plans
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Introduction to Lighting Control� Lighting control system consist of a device, typically
embedded processor or industrial computer, that’s control
electric light of a building or residence.
� One or more keypads or touch panel interfaces
� To control any device from any interface
� Ex: master touch panel might allow the users the ability to
control all lighting in a building, not just a single room. In
fact any light might be controlled from any location
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In addition� Chronological time (time of day)
� Astronomical time (sunrise/sunset)
� Room occupancy
� Events
� Alarm condition
� Program logic
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Why Use a Lighting Control� Energy Savings
� Flexibility
� Comfort
� Control of scene and sequences
� RGB Control and Dynamic Lighting
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Equip./Tech. for Control & Dimming� Functional Lighting
� Switching ->On/off
� Adjustment of intensity -> Diming (up/down)
� RGB lighting
� switching-> On/off
� Adjustment of intensity -> Diming of all R+G+B channels together
� Color variation -> Diming of individual R,G,B, channels
� Dynamic lighting
� Switching ->On/off
� Adjustment of intensity -> Diming of all WW+CW channels together
� Variation of color temperature -> Diming of individual WW+CW channels
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Equipment/Technology� 1/10V analogue
� DALI digital (Digital Addressable Lighting Interface)
� Low-speed digital protocol for controlling a maximum of 64 addresses
� DMX digital (Digital Multiplex Signal)
� High speed digital protocol based on the DMX512 standard –control of over 512 addresses
� System integration technology
� LonWorks Protocol
� Standard protocol for integrating different systems (BMS)
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Motion Detector� Indicates whether the area is occupied
� Lowers or completely switches off the light when the area is not being used
� There is always a delay (timeout ) from the moment when the area is no longer being used and lowering/switching off the lights
� Lights can be lowered before being switched off
� Coverage area – office: 8*6m (h= 3m)
� Various types of coverage available: for hallway, corridor, factory, etc
� Average energy saving of 30%- max 60%
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DALI compared to DMX� Digital addressable lighting interface � Digital Multiplex Signal
� Digital Communication protocol
� Low speed
� Bi-directional communication
(sends command and read
equipment status)
� Max 64 addresses
� Max 16 groups
� 1 address for each unit/channel ->
max 64 units/channels
� Dedicated to light control
� Digital Communication protocol
(standard DMX512)
� High speed
� Unidirectional communication
(only sends commands)
� Max 512 addresses
� Unlimited number of groups
� Use of same address for several
channels ->unlimited no. of units
� Use for other types of control, not
only for lighting
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� “Unless we understand how a particular light source
works, we cannot appreciate how to control it”.
� “Lighting Control Technology and applications”, by
Robert S. Simpson, Oxford Press. (if recommended)
� Foundation
� Lamps
� Lighting Components
� Dimmer and Control system
� Application
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Phidgets
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What is Phidgets� Phidgets are a system of low-cost electronic components
and sensors that are controlled by a personal computer.
� Phidgets are used to interface through USB connections.
� http://www.phidgets.com/
Two type of phidget components:
� Standalone control boards (USB port)
� Extensions that connect to a PhydgetInterface board:
sensors, actuators.
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Extensions� User Interface Controls:
mini joystick, toggle switches, push-buttons, touch controls, sliders, rotary buttons
� Sensors:motion sensor, capacitive touch controls, RFID, pressure sensor, light
sensor, vibration
� Actuators:LCD Screen, motor, servo, relais, lights... and by using notebook our PDA
connected to the phidget also video, sound, etc.
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Light Sensor� Light sensor, a standard
Cadmium Sulfide (CdS)
photocell resistance varies with
light. Comes with 60cm sensor
cable.
� With no light the resistance of
this sensor is 500 k ohm. At
10lux the resistance falls to
between 10 k and 5 k ohm. The
resistance is in a voltage divider
with a 7.5 ohm resistor20-5-2009 14
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Phidget Interface kit 8/8/8� It has 8 analog inputs, 8 digital inputs, and 8 digital
outputs
� The kit comes with a variety of sensors, switches, and LEDs
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Phidget Interface kit 8/8/8� have 5 boards
� need external power in some USB connectors
� surely need external power when other phidgets are connected
to the board
� 8 digital inputs, basically reading the state of a switch
� 8 digital outputs
� basically turns a switch on and off
� simple and frequent example: LEDs
� a LED is a diode, will let current pass in only one direction
� shorter pin to the ground (cathode), the longer one (anode) to the digital
output
� to avoid short, 300 Ohm resistor included in the phidget output20-5-2009 16
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Phidget Interface kit 8/8/8� 8 analog inputs
� can connect a number of packaged sensors
� but any other sensor that can be fed with 5V and produce voltage
between 0 and 5V will work.
� always disconnect the USB to the computer before modifying
the interface kit circuit! (attaching analog inputs, digital inputs
or outputs)
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Programming Languages� Phidgets can be programmed in many different
programming languages
� VB, VBA
� C, C++
� Java
� .Net
� Flash
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Languages
Flash
C#
C/C++
MAX/MSP
HTML
VB
JAVA
LABVIEW
Graphics Intelligence
Effort: Low / High20-5-2009 19
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Pros and ConsPros
� USB interface
� Many programming languages
Cons
� Documentation not very helpful
� Different versions introduce major changes to the way the phidget runs
� Device speed slow
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Applications – RFID � Elise’s memory browser
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Application – LCD � Stephan’s alarm clock (sliders connected to Phidget
InterfaceKit 8/8/8)
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Application – Servo � Loe’s 4D prototyping andTom’s semotion.
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Application – LED Board � Philip’s lighting experiments
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Application – Accelerometer � Tangible interaction
� Menu navigation
� Children’s play
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Application – Circular Touch� iPod
� Andres’s moodboard project
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Getting Phidget running� Must install phidgets21.msi and download the Phidget21
C# Library
� Both are found in Downloads > Phidget21
� This will require that you have the current .Net framework installed, which in turn may require updates to service packs and windows installer
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Use Case Scenario Discussion� Ideal Room Brightness for Video Conferencing
� For a given video profile/level, subject selects light parameters:
� Color
� Intensity
� Contrast
� Desired function
� Achieving ideal brightness in room
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System Architecture
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Light
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Future Plans� “Lighting Control Technology and applications”, by
Robert S. Simpson, Oxford Press.
� Develop API for Phidgetkit using C# (if SOFIA-SAN members agreed ).
� Ideal Room Brightness for Video Conferencing
� Light control system according to the video streaming
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Thank you very much for your Kind attention!
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