6. Harvard Technology
• Founded in 1993
• Indoor & Outdoor lightning
• US,UK
• Selected Honors & Awards
– Winner of the Samsung Bussinuss Development
Partner of the Year Award in 2016
– The Queen’s Award for Enterprise: International
Trade 2014
6
Commercial Implementation
8. Harvard Technology
• EyeNut Driver with Multi-Current
– ZigBee controlled, operating at
2.4GHz
– Dimmable LED Driver
– Programmable
– Full dimming support from 100% to
1% output current and the ability to
turn completely off
– Fully isolated
8
Commercial Implementation
9. Harvard Technology, Case Studies
• Peabody chooses EyeNut lighting controls
– Peabody is a Harvard University housing complex
– Old building
• There was no need for hard wire
9
Commercial Implementation
10. Cree Inc.
• An American worldwide manufacturer and
marketer of lighting class products
• Founded July 1987
• Revenue 1.65 billion USD
• Products
– Light bulbs
– Drivers
– Reflectors
– RF Components (Wolfspeed)
10
Commercial Implementation
11. Cree Inc.
• VOX corp.
– ZigBee Based Light bulb and accessories
– Big mistake
• No dimmer
– Automatic Dimmers are fabulous
• Business Insider
– efficiency
– Cost effective
11
http://www.vox.com/
Commercial Implementation
13. SISCO
• Founded in 1983
• Dedicated to applying standards to address
real world problems
• Services
– Consulting
– Integration
– Training
– Analytics
13
Mentioning Interference
14. SISCO
• White Papers
– WiFi Interference
• Performance Reduction
– Costumer may not be satisfied
14
Mentioning Interference
15. SISCO
• White Papers
– WiFi Interference
WiFi Devices #1 WiFi Devices #2
Two WiFi devices can work cooperatively,
IEEE802.11b are matched
15
Mentioning Interference
16. SISCO
• White Papers
– WiFi Interference
• Non-IEEE802.11 standards
• 2.4GHz
16
In case of interference:
Packet burst
No Ack.
Resending
Throughput reduction
Mentioning Interference
17. Willow Technologies
• Founded in 1989
• WiFi vs. ZigBee interference & how to avoid
– Application Note
• Test Procedure
• Test Method
17
Mentioning Interference
20. Willow Technologies
• Test strategies
– Packet delivery
• Normal mode
• RF channel selection
– WiFi
• Continuous traffic on the WiFi channel including
circular retransmission of an 8Mb
• WiFi channel 3, 2.422GHz central freq.
– MICAz
• Max. output RF power
20
Mentioning Interference
21. Willow Technologies
• Results
– MICAz and Stargate working with each other the packet
delivery rate is reduced
– When the channel separation is done
• Packet rate is 99%-100%
– WiFi with max. output power
• Interference is observed even in adjacent channels
21
Mentioning Interference
24. EE Times
• Online Journal
– Goal_ Face-to-face connection to the global electronics
community
– Subjects
• Advertise and introduce commercial electrical products
• Professional information
• Paper
– Cypress Semiconductor
• Working on wireless networks
– By R. W. Woodigs & M. Gerrior
24
Mentioning Interference
25. EE Times
• ISM band Interference
– WiFi
– Bluetooth
– Wireless USB
– ZigBee
– Some cordless phones
• Coexistence of Various Standards
– Collision Avoidance
• For WiFi
– Resending
– Finding silent channels
25
Mentioning Interference
