Smart resonating pen

1. A resonating pen having a plurality of resonance frequencies, the resonating pen comprising:

a first circuit segment comprising an inductor for the plurality of resonance frequencies;

a second circuit segment comprising a plurality of transistors, each of the plurality of transistors comprising a transistor state;

a third circuit segment comprising a controller, the controller configured to alter the transistor state of the plurality of transistors to change the resonating pen to a first resonance frequency of the plurality of resonance frequencies; and

a switch configured to trigger the controller to alter the transistor state of the plurality of transistors,

wherein the resonating pen is configured to passively transmit a synchronization signal to an input device prior to transmitting data to the input device,

wherein passively transmitting a synchronization signal comprises being, for a predefined length of time, in a second resonance frequency of the plurality of resonance frequencies, and

wherein the resonating pen is a passive pen.

2. The resonating pen of claim 1 , wherein the controller is an application specific integrated circuit (ASIC).

3. The resonating pen of claim 2 , wherein:

the input device is configured to:

operate over a plurality frames, and

drive at least one sensor electrode with signals having the plurality of resonance frequencies during each frame of the plurality of frames,

the ASIC is configured to switch resonating frequencies automatically between frames by altering the transistor state of the plurality of transistors to encode information, and

the input device is further configured to:

detect the resonate frequency of the passive pen during each frame, and

map each detected resonate frequency of the resonating pen to a bit value to decode the encoded information.

4. The resonating pen of claim 3 , wherein the input device is further configured to add, in response to receiving the synchronization signal from the resonating pen, the bit value to a previous bit value associated with a previous frame.

5. The resonating pen of claim 1 , wherein the controller is a counter.

6. The resonating pen of claim 1 , wherein the resonating pen further comprises a power source configured to store energy for the controller.

7. The resonating pen of claim 6 , wherein the resonating pen further comprises a solar cell for powering the power source.

8. The resonating pen of claim 6 , wherein the power source comprises a super capacitor.

9. The resonating pen of claim 1 , wherein the switch is configured to cycle through the plurality of resonance frequencies.

10. The resonating pen of claim 1 , wherein the resonating pen comprises two buttons for enabling four resonance frequencies.

11. A system comprising:

an input device configured to:

detect a plurality of resonance frequencies, and

enter a pattern detection mode in response to detecting a first resonance frequency of the plurality of resonance frequencies, wherein, in the pattern detection mode, the input device is configured to detect a pattern of resonance frequencies; and

a resonating pen having the plurality of resonance frequencies, the resonating pen comprising:

a first circuit segment comprising an inductor for the plurality of resonance frequencies,

a second circuit segment comprising a plurality of transistors, each of the plurality of transistors comprising a transistor state,

a third circuit segment comprising a controller, the controller configured to alter the transistor state of the plurality of transistors to change the resonating pen to a second resonance frequency of the plurality of resonance frequencies, and

a switch configured to trigger the controller to alter the transistor state of the plurality of transistors,

wherein the resonating pen is configured to passively transmit a synchronization signal to the input device prior to transmitting data to the input device,

wherein passively transmitting a synchronization signal comprises being, for a predefined length of time, in the first resonance frequency of the plurality of resonance frequencies, and

wherein the resonating pen is a passive pen.

12. The system of claim 11 , wherein the resonating pen comprises two buttons for enabling four resonance frequencies.

13. The system of claim 11 , wherein:

the input device is configured to:

operate over a plurality frames, and

drive at least one sensor electrode with signals having the plurality of resonance frequencies during each frame of the plurality of frames,

the controller is an ASIC configured to switch resonating frequencies automatically between frames by altering the transistor state of the plurality of transistors to encode information, and

the input device is further configured to:

detect the resonate frequency of the passive pen during the frame, and

map each detected resonate frequency of the resonating pen to a bit value to decode the encoded information.

14. The system of claim 13 , wherein the input device is further configured to add, in response to receiving the synchronization signal from the resonating pen, the bit value to a previous bit value associated with a previous frame.

15. A resonating pen having a plurality of resonance frequencies, the resonating pen comprising:

a tip;

a first circuit segment comprising an inductor for the plurality of resonance frequencies;

a second circuit segment comprising a plurality of transistors, each of the plurality of transistors comprising a transistor state;

a third circuit segment comprising a force sensor configured to detect a force on the tip to obtain a detected force; and

a fourth circuit segment comprising a controller, the controller configured to alter the transistor state of the plurality of transistors to change, based on the detected force, the resonating pen to a first resonance frequency of the plurality of resonance frequencies,

wherein the resonating pen is configured to passively transmit a synchronization signal to the input device prior to transmitting data to the input device,

wherein passively transmitting a synchronization signal comprises being, for a predefined length of time, in a second resonance frequency of the plurality of resonance frequencies, and

wherein the resonating pen is a passive pen.

16. The resonating pen of claim 15 , wherein the controller is an application specific integrated circuit (ASIC).

17. The resonating pen of claim 16 , wherein the ASIC is configured to passively transmit force information of the detected force by changing between the plurality of resonance frequencies.

18. The resonating pen of claim 15 , wherein the resonating pen further comprises a power source configured to store energy for the controller.

19. The resonating pen of claim 18 , wherein the resonating pen further comprises a solar cell for powering the power source.

20. The resonating pen of claim 1 , wherein the resonating pen comprises two buttons for enabling four resonance frequencies.