Communication to device through lighting control

A system comprising:

• a transceiver;
• and
• a controller that is operably coupled to the transceiver, wherein the controller comprises a computing device programmed to:
• cause a light emitter to transmit an optical signal, wherein transmitting the optical signal comprises transmitting a code by modulating an intensity of illumination provided from the light emitter;
• cause a display to provide a first image;
• use the transceiver to receive, from a device exposed to the illumination provided by the light emitter, a wireless transmission produced by the device in response to being exposed to the illumination;
• and
• responsive to receiving the wireless transmission and based on contents of the received wireless transmission, cause the display to provide a second image.

A method comprising:

• causing a light emitter to transmit an optical signal, wherein transmitting the optical signal comprises transmitting a code by modulating an intensity of illumination provided by the light emitter, wherein the code is indicative of a cryptographic key;
• receiving a wireless transmission from a device exposed to the illumination provided by the light emitter;
• using the cryptographic key to decode at least a portion of the received wireless transmission;
• and
• transmitting, to the device exposed to the illumination, information encrypted using the cryptographic key;
• causing the light emitter to transmit a second optical signal, wherein transmitting the second optical signal comprises transmitting a second code by modulating an intensity of illumination provided by the light emitter, wherein the second code is indicative of a second cryptographic key;
• receiving a second wireless transmission from the device exposed to the illumination provided by the light emitter;
• using the second cryptographic key to decode at least a portion of the received second wireless transmission;
• and
• transmitting, to the device exposed to the illumination, information encrypted using the second cryptographic key.