Block Diagram of the Design
The Wedge Watcher is a compact reader that fits within a reasonably sized base unit and uses a rechargeable battery that can last for at least 24 hours. Using ultra high frequency, the reader obtains an RFID read/write range of 12 inches. This allows the golfer to be notified of a missing club at an appropriate time. The casing of the reader contains a built-in LCD screen that enables the user to verify the amount of clubs within the bag. A low battery indicator, Piezo buzzer, and power switch is also integrated into the system to achieve functionality as well as usability. The metal-mount tag is low profile and provides a strong durability that can withstand strong vibration and minor scratches.
The algorithm, which is implemented into the Wedge Watcher, is able to poll and keep track of up to 16 tags every 30 seconds. The program notes the amount of clubs leaving, and, pending an initial grace period after removal, if the same amount of clubs are not returned to the bag within 30 seconds of each other, the buzzer sets off, letting the golfer know a club has been left behind. Also, if any club is out for a significant period of time (~7 minutes), the buzzer will go off as well. Between the time of reading and the next sequence, the system is programmed to enter sleep mode for a short amount of time to save power during a game of golf. The power switch doubles up as a reset switch, and after each reset, the program does a preliminary read to take inventory of the clubs.
State Diagram of the Algorithm