Difference between revisions of "ELCN"
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==ELCN Transmitter== | ==ELCN Transmitter== | ||
− | The transmitter injects a 1MHz carrier into the | + | The transmitter injects a 1MHz carrier into the AC line at each zero crossing when its transmitting. It is connected to the line by a high pass filter. |
==ELCN Receiver== | ==ELCN Receiver== |
Revision as of 22:59, 1 August 2007
Contents
Overview
The ELCN (Embedded Luminaire/Lighting Control Network) is the physical layer for transmitting light level data to embedded dimmers.
ELCN Transmitter
The transmitter injects a 1MHz carrier into the AC line at each zero crossing when its transmitting. It is connected to the line by a high pass filter.
ELCN Receiver
The receiver has a high pass filter to remove the 60 Hz signal and a diode-capacitor detector to demodulate the data.
Mechanical
The ELCN module will fit between the light bulb and the bottom of the socket.
Preliminary Results
- 1 MHz square wave, 8 Vpp input to AC line though 2.2nF coupling cap with 10 K to ground
- Transmitted from Diddy's room to Emily's room. 250 mV signal, 250 mV noise
Second test circuit: File:ELCN.pdf
To Do
Transmitter
- improve output stage
- add modulator
Receiver
- improve filter
- bias for single supply operation
- add gain stage, perhaps AGC
- design and test demodulator
- add surge protector
- design power supply
East Campus Old Wiring
Phases are assigned arbitrarilly. Phase 1 for Bemis is not necessarily the same as phase 1 for Walcott.
Bemis
Phase 1
- B407 south old circuit
- B406 north old cirucit
Phase 2
Phase 3
Walcott
Phase 1
- W401 south old circuit
- lounge quad outlet by cocoa pot
- lounge lighting
Phase 2
- louge outlet by rack
Phase 3