Patent ID: 8624738

Claim:
An apparatus for determining whether a golf club has been removed from a golf bag, comprising: a first light sensor which has an output; a second light sensor; a light pipe, the light pipe being configured to direct light toward the first light sensor; a radio frequency (RF) transmitter coupled to the first light sensor, the RF transmitter being configured to transmit one or more signals indicating that a golf club has been removed from or replaced into a golf bag, the one or more signals being generated in response to a change of state of the first light sensor; and a logic circuit coupled to the first light sensor and coupled to the second light sensor, the logic circuit being configured to be activated based on a comparison of one or more measurements of light from the first light sensor with a first stored value, and wherein the logic circuit is configured to determine whether to change a status of the logic circuit based on a second comparison between one or more measurements of light intensity from the second light sensor and a plurality of second stored values, wherein when the second comparison is smaller than a first value the logic circuit adds the one or more measurements of light intensity from the second light sensor to one of a plurality of stored averages and the status does not change, wherein when the second comparison is greater than the first value the logic circuit compares the one or more measurements of light intensity from the second light sensor with a second value, wherein when the one or more measurements of light intensity from the second light sensor is greater than the second value the status is changed and a golf club identifier and the status are transmitted, wherein when the one or more measurements of light intensity from the second light sensor is less than the second value the status does not change, and wherein the logic circuit is configured to enter a sleep mode when the first and the second light sensors do not detect light for a period of time.