US Patent 10270528 Serial communication to device through lighting control

Systems are provided to emit, into an environment of interest, information in the form of modulated optical signals. These optical signals can be provided as illumination from a lighting fixture, display, or other source of environmental illumination. The optical signals can include codes or other information to facilitate location-specific operations of a device that is able to receive the optical signals. This can include receiving information about the location of a light emitter, security credentials or encryption keys, information about services that are available from building automation and/or conferencing systems, or other location-related information. A cellphone or other device receiving such optical signals could then operate to request information related to the received information, to submit commands to control a presentation or conferencing system, to communicate in a secure manner using a received cryptographic key, or to operate in some other way related to location-related information received via optical signals.