Tennis racket sensor system and coaching device

1. A first coaching device, comprising:

an interface configured to:

load a drill comprising at least one first coaching instruction;

receive a first input from a user to select the drill; and

output the at least one first coaching instruction;

a sensor configured to measure an impact of a tennis ball on a racket;

a wireless transceiver configured to:

transmit at least one event message to at least one second coaching device, and

receive at least one event message from the at least one second coaching device, wherein the at least one second coaching device is substantially similar to the first coaching device; and

a processor configured to:

communicate with the sensor, the wireless transceiver, and the interface;

communicate with a software application configured to:

receive a second user input to define the at least one first coaching instruction; and

add the at least one first coaching instruction to the drill;

download the drill to the first coaching device;

select the at least one first coaching instruction based on the measured impact or at least one received event message;

instruct the wireless transceiver to transmit the at least one event message to the at least one second coaching device based on the impact of the tennis ball with the racket; and

instruct the interface to output the at least one first coaching instruction.

2. The first coaching device of claim 1 wherein the first coaching device is configured to be worn on a wrist of the user.

3. The first coaching device of claim 1 wherein measuring the impact includes measuring at least one of position, direction of motion, speed of motion, acceleration, vibration, and shock.

4. The first coaching device of claim 1 wherein:

the drill further comprises at least one second coaching instruction;

the first coaching instruction corresponds to the measured impact; and

the second coaching instruction corresponds to the received event message.

5. The first coaching device of claim 1 wherein the interface is configured to record at least one second coaching instruction; and wherein the processor is configured to add the at least one second coaching instruction to the drill.

6. The first coaching device of claim 1 wherein the processor is further configured to create and maintain a manifest of coaching instructions stored on the first coaching device; and

wherein downloading the drill to the first coaching device comprises downloading only coaching instructions not already stored on the first coaching device.

7. The first coaching device of claim 1 wherein the processor is further configured to select the at least one first coaching instruction based on the drill.

8. The first coaching device of claim 7 wherein the drill defines at least one of the frequency or order at which the processor selects the at least one first coaching instruction.

9. A computer-implemented method for providing at least one coaching instruction via a coaching device, comprising:

defining the at least one coaching instruction in a software application via a first user input;

adding, via the software application, the at least one coaching instruction to a drill;

downloading the drill to a first coaching device;

receiving, at the first coaching device, the drill;

receiving, at the first coaching device, a second user input to select the drill;

measuring, at the first coaching device, an impact of a tennis ball with a tennis racket;

calculating, at the first coaching device, at least one physical parameter associated with the tennis racket;

translating, at the first coaching device, the at least one physical parameter to a physical event;

selecting, at the first coaching device, the at least one coaching instruction based on the physical event;

outputting, at the first coaching device, the at least one coaching instruction;

transmitting an event message associated with the physical event from the first coaching device to a second coaching device;

receiving the event message from the first coaching device at the second coaching device;

selecting, at the second coaching device, a second at least one coaching instruction based on the event message; and

outputting, at the second coaching device, the second at least one coaching instruction.

10. The method of claim 9 further comprising recording, at the first coaching device, a second coaching instruction and adding the second coaching instruction to the drill.

11. The method of claim 9 further comprising creating and maintaining, at the first coaching device, a manifest of coaching instructions stored on the first coaching device; and wherein downloading the drill to the first coaching device comprises downloading only coaching instructions not already on stored on the first coaching device.

12. The method of claim 9 wherein selecting, at the first coaching device, the at least one coaching instruction is further based on the drill.

13. The method of claim 12 wherein the drill defines at least one of the frequency or order at which the at least one coaching instruction is selected at the first coaching device.

14. The method of claim 12 wherein the drill comprises a defined duration of time during which the at least one coaching instruction is selected.

15. A coaching system, comprising:

a software application configured to:

receive a first user input to define at least one coaching instruction; and

add the at least one coaching instruction to a drill; and

a coaching device, comprising:

an interface configured to:

load the drill comprising the at least one coaching instruction;

receive a second user input to select the drill; and

output the at least one coaching instruction;

a sensor configured to measure impact of a tennis ball on a racket;

a wireless transceiver configured to:

transmit at least one event message to at least one other coaching device, and

receive at least one event message from the at least one other coaching device, wherein the at least one other coaching device is substantially similar to the coaching device; and

a processor configured to:

communicate with the sensor, the wireless transceiver, and the interface;

communicate with the software application;

select the at least one coaching instruction based on the measured physical impact or at least one received event message;

download the drill to the coaching device;

instruct the wireless transceiver to transmit the at least one event message to at least one coaching device based on the impact of the tennis ball with the racket; and

instruct the interface to output the at least one coaching instruction.

16. The system of claim 15 wherein the drill comprises at least one first coaching instruction and at least one second coaching instruction; and

wherein the first coaching instruction corresponds to the measured physical impact and the second coaching instruction corresponds to the received event message.

17. The system of claim 15 wherein the processor is further configured to create and maintain a manifest of coaching instructions stored on the coaching device; and wherein downloading the drill to the coaching device comprises downloading only coaching instructions that are not already stored on the coaching device.

18. The system of claim 15 wherein the processor is further configured to select the at least one coaching instruction based on the drill.

19. The system of claim 18 wherein the drill defines at least one of the frequency or order at which the processor selects the at least one coaching instruction.

20. The system of claim 15 wherein the interface is further configured to record a second coaching instruction; and wherein the processor is further configured to add the second coaching instruction to the drill.