Environmental condition and media composition sensing using near-field communications

1. A near field communications (NFC) system, comprising:

a first antenna, positioned on an object, configured to detect an electromagnetic field in a proximity of the first antenna and output a voltage representative of the detected electromagnetic field; and

an NFC controller configured to:

determine a condition of the object based on both the voltage representative of the detected electromagnetic field and an association between the voltage representative of the detected electromagnetic field and the condition of the object; and

output data representative of the determined condition of the object.

2. The NFC system of claim 1 , comprising:

memory, coupled to the NFC controller, configured to store the association between the voltage representative of the detected electromagnetic field and the condition of the object.

3. The NFC system of claim 1 , comprising:

a second antenna configured to irradiate the electromagnetic field in a proximity of the second antenna.

4. The NFC system of claim 3 , wherein the first and second antennas are planar antennas and are co-located on a same two-dimensional plane.

5. The NFC system of claim 1 , wherein the condition of the object is at least one of an environmental condition of the object or a composition of media of the object.

6. The NFC system of claim 1 , wherein the condition of the object is at least one of a temperature, pressure, or humidity of the object or a liquid level or an amount of air in the object.

7. The NFC system of claim 1 , wherein the object is a heating pad, a drinking cup or a concrete structure.

8. The NFC system of claim 7 , wherein the condition of the object is a temperature of the heating pad, a liquid level of the drinking cup or a presence of a crack in the concrete structure.

9. The NFC system of claim 1 , comprising:

a communication device coupled to the NFC controller, wherein:

the NFC controller is configured to output, to the communication device, the data representative of the determined condition of the object; and

the communication device is configured to transmit the data representative of the determined condition of the object to another device.

10. A method, comprising:

detecting, by a first antenna positioned on an object, an electromagnetic field in a proximity of the first antenna;

outputting, by the first antenna, a voltage representative of the detected electromagnetic field;

determining, by an NFC controller, a condition of the object based on both the electromagnetic field and an association between the electromagnetic field and the condition of the object; and

outputting, by the NFC controller, data representative of the determined condition of the object.

11. The method of claim 10 , comprising:

storing the association between the electromagnetic field and the condition of the object.

12. The method of claim 10 , comprising:

irradiating, by a second antenna, the electromagnetic field in a proximity of the second antenna.

13. The method of claim 10 , wherein the condition of the object is at least one of an environmental condition of the object or a composition of media of the object.

14. The method of claim 13 , wherein the condition of the object is at least one of a temperature, pressure, or humidity of the object or a liquid level or an amount of air in the object.

15. The method of claim 10 , wherein the object is a heating pad, a drinking cup or a concrete structure and the condition of the object is a temperature of the heating pad, a liquid level of the drinking cup or a presence of a crack in the concrete structure.

16. The method of claim 10 , comprising:

outputting, to a communication device, the data representative of the determined condition of the object; and

transmitting, by the communication device, the data representative of the determined condition of the object to another device.

17. A system, comprising:

a first device operable to have a varying condition; and

a near field communications (NFC) system mounted on the first device, the NFC system including:

a first antenna configured to detect an electromagnetic field; and

an NFC controller, coupled to the first antenna, configured to:

determine the condition of the first device based on both the electromagnetic field and an association between the electromagnetic field and the condition of the first device; and

output data representative of the determined condition of the first device.

18. The system of claim 17 , wherein the NFC system includes memory, coupled to the NFC controller, configured to store the association between the electromagnetic field and the condition of the first device.

19. The system of claim 17 , wherein the NFC system includes a second antenna configured to irradiate the electromagnetic field in a proximity of the second antenna and wherein the first and second antennas are planar antennas and are co-located on a same two-dimensional plane.

20. The system of claim 17 , wherein the condition of the first device is at least one of an environmental condition of the first device or a composition of media of the first device.

21. The system of claim 17 , wherein the NFC system includes a communication device coupled to the NFC controller, and wherein the NFC controller is configured to output, to the communication device, the data representative of the determined condition of the first device, and the communication device is configured to transmit the data representative of the determined condition of the first device to another device.