A let detection system includes a sensor including an accelerometer attached to a tennis net. The sensor is in wireless communication with an umpire device able to send a message to the sensor, wherein the message causes the sensor to calibrate and begin monitoring for a let. The sensor determines a three-dimensional (3D) vector representing the gravity acting on the sensor as a baseline. When the sensor detects vertical acceleration of the net relative to the baseline and the vertical motion is above a preset threshold, the sensor automatically transmits a let notification message to the umpire device.

A net system comprising a central hub having a main body including exposed upper and lower ends, and a plurality of longitudinal hub connectors in spaced relation to each other. The net system additionally includes a first and second net modules, each including a net having an upper end and a lower end, and a longitudinal net connector connected to the net. The longitudinal net connector includes an upper end adjacent the upper end of the net and a lower end adjacent the lower end of the net, with each longitudinal net connector extending continuously between its upper end and its lower end. The first and second longitudinal net connectors are configured to be detachably engageable to respective ones of the plurality of longitudinal hub connectors to facilitate connection of the first and second net modules to the hub connector.

Disclosed herein is an adjustable net system that includes a net having a first net end and a second net end, a net mesh portion, a first net end sleeve, a second net end sleeve, an upper net tape extending along a top of the net mesh portion and a lower net tape extending along a bottom of the net mesh portion. The system further including a releasable first net clamp and releasable second net clamp secured to the second net end sleeve, wherein the releasable first net clamp is selectably engageable with the upper net tape and the releasable second net clamp is selectably engageable with the lower net tape, and wherein the net mesh portion is securable with the releasable first net clamp and releasable second net clamp.

In some aspects, the techniques described herein relate to a single stick for a net on a tennis court configured to maintain the net cord at its regulation height, including: a net cord support clip including a first portion configured to receive a net cord, and a second portion dimensioned such that the net cord remains within the first portion; and a single stick pipe, wherein the single stick pipe includes an open-topped channel, and wherein the net cord support clip is placed in the open-topped channel.

Sports equipment and/or areas of play are provided, comprising a sports equipment or area of play and a sensor.

A ball supply apparatus includes: a housing coupled to the upper portion of the column structure, wherein a top portion of housing is partially opened, wherein the housing is divided by a partition into a ball storage portion and a ball discharge portion, wherein a bottom face of the ball storage portion is inclined downward toward the ball discharge portion, wherein a first opening is formed in a bottom of the ball discharge portion, and a second opening is formed in the partition at a lower portion thereof; a rotatable opening/closing plate rotatably coupled to the partition, wherein the rotatable opening/closing plate is configured to rotate to open/close the second opening; and a ball discharge tube rotatably coupled to the ball discharge portion at the first opening, wherein the ball discharge tube ball-communicates with the ball discharge portion via the first opening.

A trampoline comprising a trampoline mat defining a jumping area and supported via springs from a circumextending support structure, the support structure including a plurality of legs so that the trampoline mat is positioned at a height above ground or flooring; the trampoline being provided with a safety enclosure surrounding the jumping area. The safety enclosure comprises a net supported by a plurality of telescopically extendable poles, each pole when extended comprising a plurality of sections, each successive extended section with distance above the trampoline mat having a cross-section less than that that of the next less extended section whereby the sections nest when telescopically collapsed. The lowermost such section is supported at a position above the ground or flooring by the support structure.

The disclosure provides a badminton net rack, comprising a base, has an grounding side and a mounting side opposite to each other, the base comprises two seat bodies, a support rod connecting the two seat bodies, and a connector spanning the support rod, the connector comprises a first stuck part and a second stuck part, the first stuck part is used for stuck badminton racket; two telescopic rods, can be switched between an inverted trapezoidal state and a stuck state, in the inverted trapezoidal state, the two telescopic rods are respectively connected to the two seat bodies to form an inverted trapezoidal structure for installing a ball net, in the stuck state, the two telescopic rods are respectively stuck to the two second stuck parts of the connector. The above-mentioned badminton net rack has various functions, is more portable and has better stability.

A net system comprising a first net module including a first housing, a first net and a first connector connected to the first net. The first net being retractably connected to the first housing. The net system additionally includes a second net module including a second housing, a second net and a second connecter connected to the second net, the second net being retractably connected to the second housing. The first connector is connectable to the second connector to detachably connect the first net module to the second net module.