Patent ID: 8192293

Claim:
A method for predicting a golfer's swing speed, the method comprising: a microprocessor configured to receive data from an accelerometer, the microprocessor configured to: determine that a golfer is addressing a golf ball to swing a golf club, the golf club comprising a device attached to a grip of the golf club, the device comprising the accelerometer and a radiofrequency transceiver, the device having a main body with a diameter ranging from 20 to 25 mm and a projection body having a length ranging from 1 to 5 mm; monitor a backswing of the golfer utilizing the accelerometer at a rate of at least 1 kilo-Hertz; determine a transition time from a backswing to a downswing of the golfer utilizing the accelerometer at a rate of at least 1 kilo-Hertz; monitor the downswing of the golfer utilizing the accelerometer at a rate of at least 1 kilo-Hertz; determine an impact time of the golf club with the golf ball utilizing the accelerometer at a rate of at least 1 kilo-Hertz; transmit data for the golfer's swing to a receiver for analysis, the data comprising the transition time and the impact time; and generate a golfer's swing speed using a length of a shaft of the golf club, the transition time and the impact time, wherein the device is in continuous operation between at least a sleep mode, a monitoring mode and a transmission mode, wherein the device consumes less than 600 nano-amps of power in the sleep mode, wherein the device consumes less 200 micro-amps of power during the monitoring mode, and wherein the device consumes less than 12 milli-amps of power during the transmission mode.