Fiat Lux: Personalized Automated Lighting Controls
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Fiat Lux: Personalized Automated Lighting Controls. Omar Rehmane, Andrew Krioukov, David Culler. Commercial Buildings. 37% of electricity in US $107B annual energy bills Lighting is 25% of building power. Lighting Control in Buildings.

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Fiat Lux: Personalized Automated Lighting Controls

Omar Rehmane,

Andrew Krioukov,

David Culler


Commercial buildings
Commercial Buildings

37% of electricity in US

$107B annual energy bills

Lighting is 25% of building power


Lighting control in buildings
Lighting Control in Buildings

  • Residential: personal control allows for energy efficient use

  • Commercial: shared space, automated system inconvenient and inefficient use

    • Schedules

    • Override buttons

    • Motion detection


Sutardja dai hall
Sutardja Dai Hall

Software controllable!

3 years old

7 floors, 140k sq. feet

Collaboratories, offices, classrooms, auditorium & nanofab


7 th floor
7th Floor

Lighting Power Meter

Controller & Relays


Old Controls

  • 10:00 AM – 6:00 PM: Lights run on a schedule

  • Other times: 2 hour timer

  • Interface: Physical wall-mounted button

  • Hard to control brightness






Issues
Issues

  • Requires user action to indicate presence

  • How long to make the timer?

  • Wasted energy vs. user input demand trade off


Proposed solution
Proposed Solution

  • Cross-platform system tray app, Fiat Lux

  • Automatically keeps the lights on for users


Developing apps for buildings
Developing Apps for Buildings

sMAP/

REST API

HTML/HTTP

MySQL

Python

Control Process

Python

Django

sMAP

Gateway

BACnet

Fiat Lux


Challenges

Challenges

(and their solutions)


Location

There are also laptop users in SDH

They might continue to keep the lights on from home inadvertently

Only allow users in SDH to keep the lights on

MAC address fingerprinting

Improving localization

Check IP address if wifi is not active

This also means that lights will automatically start if Fiat Lux is running when the user comes in

Location


Idle users

Sutardja Dai Hall has desktop users that lock their screen rather than logging out

Due to automated extending, this can keep the lights on if the user forgets to stop Fiat Lux

Stop extending the lights for idle users

Determine idle status through the system idle time (taken from OS)

Decided on 5 minutes as an appropriate idle time

Idle Users


Wasted time

Timer extends to either 3 hours or 1 hour rather than logging out

This means the lights can be on in an empty zone/floor for up to 3 hours!

Fiat Lux extends the timer automatically, so the frequency doesn’t matter

Extend the timer to 2 minutes every 1 minute (allowing for any communication delay)

Maximum wasted “on” time: 2 minutes

Wasted Time


Brightness wars

Users with conflicting brightness settings will constantly have the lights switching brightness settings

More disruptive than lights simply turning off once in a while

The web client solves this by maintaining a single brightness control per zone

Fiat Lux emulates this “most recent wins” model by extending the current setting during automatic updates

The user must manually change the setting to update brightness in the room

“Brightness Wars”


Overall control logic
Overall Control Logic have the lights switching brightness settings


Advantages
Advantages have the lights switching brightness settings

  • Automatic extension removes input demand

  • Only extends the lights for active users in the building

  • Maximum wasted time is 2 minutes

  • Eliminates energy savings vs. user input demand tradeoff


Next steps
Next Steps have the lights switching brightness settings

  • Phone version of Fiat Lux

  • HVAC controls


Questions
Questions? have the lights switching brightness settings


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