An Internet of Thing (IoT) device includes a body with a processor, a camera and a wireless transceiver coupled to the processor.

An Internet of Thing (IoT) device includes a body with a processor, a camera and a wireless transceiver coupled to the processor.

A ball picking robot and a ball unloading method using the same. The ball picking robot includes a chassis, an L-shaped hanging lug, a ball storage frame, an electric push rod disposed on the chassis, a baffle disposed on the chassis, a bracket disposed on the chassis and a drive motor for driving the electric push rod to move. A movable end of the electric push rod is connected with one end of the L-shaped hanging lug, the other end of the L-shaped hanging lug is connected with a side of the ball storage frame, and a camera is disposed on the bracket.

The tennis ball supply device according to an embodiment of the present invention includes a communication circuit configured to communicate with an external device; a launcher configured to launch a ball; a body unit configured to move the launcher; and a controller configured to: control the body unit to move to a first position, identify whether the body unit is disposed on the first position based on a signal received from the communication circuit, based on identifying that the body unit is disposed on the first position, control the launcher to launch the ball, control the body unit to move to a second position after the launcher has stopped launching the ball, and identify whether the body unit is disposed on the second position based on the signal received from the communication circuit.

The tennis ball supply device according to an embodiment of the present invention includes a communication circuit configured to communicate with an external device; a launcher configured to launch a ball; a body unit configured to move the launcher; and a controller configured to: control the body unit to move to a first position, identify whether the body unit is disposed on the first position based on a signal received from the communication circuit, based on identifying that the body unit is disposed on the first position, control the launcher to launch the ball, control the body unit to move to a second position after the launcher has stopped launching the ball, and identify whether the body unit is disposed on the second position based on the signal received from the communication circuit.

A wearable training apparatus has a vision-control assembly for engaging a user's face about the user's eyes. The vision-control assembly has a see-through area about the user's eyes and an opaque area surrounding the see-through area at least on a temporal side and an inferior side thereof. The opaque area is for substantially blocking at least major portions of the natural monocular vision-areas of a natural field of vision (FOV) of the user's eyes, said natural monocular vision-areas being peripheral to a natural binocular vision-area on respectively temporal sides. The see-through area is for forming a reduced FOV about a gaze direction. The reduced FOV has a span encompassing at least a major portion of the natural binocular vision-area of the natural FOV of the user's eyes about the gaze direction thereof, said natural binocular vision-area being at an angular center of the natural FOV.

The tennis self-training system according to an embodiment of the present invention comprising a control device comprising recording unit configured to record a tennis game and a processor configured to analysis the tennis game based on a video obtained from the recording unit; and a ball machine unit configured to move and launch a ball according to the instructions of the control device; wherein the control device is configured to: determine the position of a player and the position of the ball machine unit based on the video, predict a falling position of the ball hit by the player based on the video, calculate a ball launch position and a ball arrival position of the ball machine unit based on the position of the player and the falling position of the ball, generate a control signal related to the ball launch position and the ball arrival position, transmit the control signal to the ball machine unit, wherein the ball machine unit is configured to: receive the control signal from the control device, move to the ball launch position indicated by the received control signal, and launch the ball to the ball arrival position indicated by the received control signal.

The tennis self-training system according to an embodiment of the present invention comprising a control device comprising recording unit configured to record a tennis game and a processor configured to analysis the tennis game based on a video obtained from the recording unit; and a ball machine unit configured to move and launch a ball according to the instructions of the control device; wherein the control device is configured to: determine the position of a player and the position of the ball machine unit based on the video, predict a falling position of the ball hit by the player based on the video, calculate a ball launch position and a ball arrival position of the ball machine unit based on the position of the player and the falling position of the ball, generate a control signal related to the ball launch position and the ball arrival position, transmit the control signal to the ball machine unit, wherein the ball machine unit is configured to: receive the control signal from the control device, move to the ball launch position indicated by the received control signal, and launch the ball to the ball arrival position indicated by the received control signal.

A ball hitting practice device includes a shaft having a target at a distal end, a grip at a proximal end, an accelerometer, a microprocessor, and a way of providing feedback to a person hitting the target. A ball hitting practice system includes a ball hitting practice device and a computing device wirelessly communicating with the ball hitting practice device. A method for practicing ball hitting involves striking the target of a ball hitting practice, transferring timed acceleration data to the computing device, correlating ball hitting parameters with a training condition and displaying the correlated ball hitting parameter in a display.

A ball hitting practice device includes a shaft having a target at a distal end, a grip at a proximal end, an accelerometer, a microprocessor, and a way of providing feedback to a person hitting the target. A ball hitting practice system includes a ball hitting practice device and a computing device wirelessly communicating with the ball hitting practice device. A method for practicing ball hitting involves striking the target of a ball hitting practice, transferring timed acceleration data to the computing device, correlating ball hitting parameters with a training condition and displaying the correlated ball hitting parameter in a display.