Self identifying modulated light source
In one aspect, the present disclosure relates to a self identifying light source including an emitter that produces visible light; and an autonomous modulator in electrical communication with the emitter that automatically and continually modulates the visible light produced by the emitter, wherein the modulated visible light represents an identification code of the light source. In some embodiments, the emitter is a light emitting diode (LED) and further comprises an LED driver that provides a specified voltage and current to each LED in the light source.
1. A light source comprising:
a microcontroller;
an emitter of visible light; and
a modulator in electrical communication with the microcontroller and the emitter, wherein:
the microcontroller is configured to provide a packet of information to the modulator, the packet of information comprising:
a starting bit sequence; and
a data bit sequence following the starting bit sequence, wherein the data bit sequence represents a variable bit identification code identifying the light source; and
wherein the microcontroller is further configured to provide a variable number of bits as the variable bit identification code; and
the modulator is configured to modulate, based on the packet of information, the emitter to produce a modulated light signal.
2. The light source of claim 1 , wherein the microcontroller is further configured to provide an error detection bit sequence after the data bit sequence as part of the packet of information.
3. The light source of claim 1 , wherein the microcontroller is configured to randomly generate the variable bit identification code of the light source during initial power on of the light source.
4. A mobile device, comprising:
a camera;
a processor coupled to the rolling shutter camera;
a memory; and
software in the memory to be run by the processor, wherein running of the software by the processor configures the mobile device to implement functions, including functions to:
operate the camera to capture one or more images including modulated light broadcast by a light source; and
demodulate the modulated light from the captured one or more images to obtain a packet of information, the packet of information comprising:
a starting bit sequence; and
a data bit sequence following the starting bit sequence, wherein the data bit sequence represents a variable bit identification code identifying the light source; and
determine, based on the data bit sequence, the variable bit identification code identifying the light source.
5. The mobile device of claim 4 , wherein the implemented functions further include a function to:
determine, based on an error detection bit sequence following the data bit sequence, a validity of the data bit sequence.
6. The mobile device of claim 4 , wherein the function to demodulate the modulated light comprises a function to:
analyze the captured one or more images to determine a pattern of distortions within the captured one or more images, the pattern of distortions being related to the packet of information.
7. The mobile device of claim 4 , wherein the camera is a rolling shutter camera.
8. A mobile device, comprising:
a camera;
a processor;
a memory coupled to the processor; and
a module coupled to the camera and the processor, the module configured to:
operate the camera to capture one or more images including modulated light broadcast by a light source;
demodulate the modulated light from the captured one or more images to obtain a packet of information, the packet of information comprising:
a starting bit sequence; and
a data bit sequence following the starting bit sequence, wherein the data bit sequence represents a variable bit identification code identifying the light source;
extract the data bit sequence from the packet of information;
provide the data bit sequence to the processor; and
determine, based on the data bit sequence, the variable bit identification code identifying the light source.
9. The mobile device of claim 8 , wherein the camera is a rolling shutter camera.
10. A system comprising:
a light source comprising:
a microcontroller;
an emitter of visible light; and
a modulator in electrical communication with the microcontroller and the emitter, wherein:
the microcontroller is configured to provide a packet of information to the modulator, the packet of information comprising:
a starting bit sequence; and
a data bit sequence following the starting bit sequence,
wherein the data bit sequence represents a variable bit identification code identifying the light source; and
wherein the microcontroller is further configured to provide a variable number of bits as the variable bit identification code;
and
the modulator is configured to modulate, based on the packet of information, the emitter to produce a modulated light signal; and
a mobile device comprising:
a camera;
a processor; and
a memory coupled to the processor, wherein the mobile device is configured to implement functions, including functions to:
operate the camera to capture one or more images including the modulated light signal broadcast by the light source; and
demodulate the modulated light signal from the captured one or more images to obtain the packet of information.
11. The system of claim 10 , wherein:
the mobile device further comprises software in the memory to be run by the processor; and
running of the software by the processor configures the mobile device to implement the functions.
12. The system of claim 10 , wherein:
the mobile device further comprises a module coupled to the camera and the processor; and
the module configures the mobile device to implement the functions.
13. The system of claim 10 , wherein the microcontroller of the light source is further configured to provide an error detection bit sequence after the data bit sequence as part of the packet of information.
14. The system of claim 10 , wherein the microcontroller is configured to randomly generate the variable bit identification code of the light source during initial power on of the light source.
15. The system of claim 10 , wherein the implemented functions further include a function to:
determine, based on an error detection bit sequence following the data bit sequence, a validity of the data bit sequence.
16. The system of claim 10 , wherein the implemented functions further include a function to:
determine, based on the data bit sequence, the variable bit identification code identifying the light source.
17. The system of claim 10 , wherein the function to demodulate the modulated light comprises a function to:
analyze the captured one or more images to determine a pattern of distortions within the captured one or more images, the pattern of distortions being related to the packet of information.
18. The system of claim 10 , wherein the camera is a rolling shutter camera.