1. Meeting Room Automation
1. Xhesika RUCI
2. Mina Rady
3. Ida McSey
4. Mukhammadjon Jalolov

2. Problem Devices consuming power after work Meeting time Conflict
Degraded Comfort Level
Meeting time Conflict
Waste of electricity
Inefficient Meetings
Security of Facility

3. We are motivated to improve
Motivations
We are motivated to improve
Energy Efficiency
Monitoring
Smart Comfort
Facility Security
Smart Comfort

4. Sustainability Social Sustainability Efficiency Economic Save money
Environmental
Save natural Resources

5. Idea
Our system synchronizes with personal or organizational calendars and adapts room comfort and security measures accordingly.

6. TAVATA offers
- Integration with existing personal and organizational calendars.
- Monitor Air Quality
- Wait until people leave and turn Off heater/cooler, lights.
- Monitor unauthorized access in the room through motion detection and door status.
- Notify admins via of security breaches.

7. System Architecture Meeting room LED Displays Motion Sensor Dimmer
Meeting room
LED Displays
Motion Sensor
Dimmer
Thermostat
Humidity/Temperature

8. Main Logic Display Control Watchdog: Notifications:
Display current Temp/Hum
Check current schedule:
Room is empty Display upcoming meeting schedule
Display current meeting title
Watchdog:
Check door status and check calendar
No scheduled meeting and no motion Turn off lights
No scheduled meeting and door is open Warning to administrator
Notifications:
Door opens Turn on light
Motion detected out of schedule hours Warning and make sure devices are turned off

9. Short Explanation of FHEM and impression
FHEM provides common interface to interact with different home automation technologies.
It offers different open interfaces as well to allow other systems to be interoperable with it. Mainly JSON and XML
It allows integrating PERL codes and scripts. However, it provides many limitations as all configuration has to be done within the FHEM framework.
All FHEM forums are in German which made it difficult to get feedback from other developers facing similar problems.

10. FHEM Limitations
FHEM runs on single-threaded Raspberry PI. This makes it quite challenging to trigger multiple notifications for the same event.
FHEM does not allow typical HTTP hosting for any files outside of its framework, we had to install APACHE server to implement our monitoring interface.
FHEM does not allow safe modularity or scalability. Since PERL scripts can only be used within its framework, the only way to create truly modular perl components is to use an embedded tool: 99_myUtils.pm which has to be completely compliant to the particular limitations and dependencies of FHEM.

11. Savings Considering the average CO2 emission factor = 0.527 kg / kWh
The electricity price EUR per kWh
Around 12 meetings per month.
Assuming appliances are left on for 10 hours after meeting
Appliance
Money saving per month
CO2 emissions
Per year
CO2 Per year
Heaters (2) 2400 W
63.36 EUR
151.7 kg
EUR kg
LED lights (20) 300 W
7.92 EUR
18.9 kg
95.04 EUR
226.8 kg
Air conditioners (2) 2400 W (in summer time)
Total:
71.28 EUR
170.6 kg
EUR kg

12. Wireless Communications Protocol
Residential Control
Automation Market
Z-Wave Technology
Smart Living Solutions
Wireless Security Sensors & Emergency Alarms
IoT based devices
Energy & Light Commercial Apps

13. Z-Wave Technology
Originally developed by Danish Startup Zen-Sys
Acquired by Sigma Designs (American public Corporation) in 2008
Over 1700 interoperable Z-Wave products marketed
Over 35 million been sold since 2005

14. How Z-Wave works ? Z-Wave Network – Unique Home ID
Slave Devices: Up to 232 Nodes
Home ID + unique Node ID
Bridging Option - if more devices needed.
Controller Devices: Predefined Network ID
Primary/Secondary

15. Z-Wave Protocol Stack Application Security Network Transport
Device Specific Commands
App specific commands
Takes control of payloads in the frames
Application
Encryption (AES-128 type)
(Implementation Specific)
Security
Topology Discovery
Frame Routing/ Routing Table Update
Network
Error Detection & Retransmission
Acknowledgements
Transport
32-bit Home ID, up to 4 billion Z-Wave Networks
8- bit Node ID- max 232 Nodes
(EU) / (US) MHz- unlicensed ISM bands
Modulation, RF channel assignment, Preamble addition
MAC & Physical
ITU-T G9959
Physical Layer- Modulation, RF channel assignment, preamble addition in transmitter and synch of preamb in receiver
MAC- control the medium between nodes based on collision avoidance alg and backoff alg

16. Why use Z-Wave ? Network installation is easy and simple
Lightweight hop protocol
Low Power Consuption Devices- Power Save mode
Low-latency transmission of small data packets.
Z-Wave devices are interoperable with other IoT wireless devices
AES-128 type of encryption - Secured wireless network
No Wi-Fi Interference, quiet frequency

17. Technical Specifications
Z-Wave - source-routed mesh network architecture
Downfall: increased frame length, the route should be included inside of the payload
Low-latency transmission of small data packets. Supports 9.6 Kb/s, 40 Kb/s up to 100 Kb/s data rates - control and sensor applications
Communication distance between two nodes – about meters. Up to 4 hops Message
FSK Modulation with Manchester channel encoding
Max payload data – 64 bits, 8 bit address blocks
Z-wave devices are interoperable with other wireless devices in IoT
It uses AES-128 type of encryption to provide secured wireless network- spec. for the encryption of electronic data.
The algorithm described by AES is a symmetric-key algorithm, meaning the same key is used for both encrypting and decrypting the data. AES is included in the ISO/IEC standard. AES is available in many different encryption packages, and is the first (and only) publicly accessible cipher approved by the National Security Agency (NSA) for top secret information when used in an NSA approved cryptographic module (see Security of AES, below).

18. Comparisons
Wi-Fi : noisy static larger bandwidth (2.4/ 3.6/ 4.9/ 5 / 5.9 GHz, 22MHz Channels )
Bluetooth: No remote access: point to point bandwidth (2.4GHz, 2MHz channels)
Z-wave : Interoperability, quiet frequency
Zigbee: Similar in power, range and low cost but incompatible with Z-wave.

20. Thank you!