Portable electronic devices

Abstract

A variety of improvements to portable electronic devices are disclosed, particularly electronic devices designed for use in and around water. The improvements include a more secure interface jack, improved waterproofing techniques, improved battery stability, and improved device functionality. One or more of the disclosed improvements may be incorporated into a variety of portable electronic devices.

1 - 19 . (canceled) 
     
     
         20 . A method of counting laps in a pool by a swimmer, comprising:
 providing a portable electronic device having a processor, a memory, and at least one gyroscope;   collecting data from the gyroscope;   detecting a turn using data from the gyroscope; and   counting a lap when two turns have been detected.   
     
     
         21 . The method of  claim 20 , wherein detecting a turn uses peak detection. 
     
     
         22 . The method of  claim 20 , wherein data is collected from the gyroscope as a rolling sum. 
     
     
         23 . The method of  claim 22 , wherein the rolling sum from the gyroscope is filtered using a low-pass filter. 
     
     
         24 . The method of  claim 20 , wherein detecting a turn uses data only from the gyroscope. 
     
     
         25 . The method of  claim 20 , further comprising recording a lap time during the counting step. 
     
     
         26 . The method of  claim 25 , further comprising determining an average lap time from the recorded lap times. 
     
     
         27 . A method of counting a swimmer's laps in a pool, comprising:
 wearing a portable electronic device having a processor, a memory, and at least one gyroscope;   collecting data from the gyroscope;   entering the collected data as individual data points into a buffer;   generating a rolling average when the data buffer is full by adding the newest data point, removing the oldest data point, summing the top half of the data buffer to create a first sum, summing the bottom half of the buffer to create a second sum, taking the difference between the first sum and the second sum to generate a current difference, adding the current difference to a total sum, and dividing the total sum by the number of data points collected;   detecting a turn by comparing the current difference to the rolling average; and   counting a lap when two turns have been detected then entering a waiting state.   
     
     
         28 . The method of  claim 27 , wherein the waiting state is exited after a preset amount of time. 
     
     
         29 . The method of  claim 28 , wherein the preset amount of time varies by user. 
     
     
         30 . The method of  claim 27 , wherein the detecting step occurs after a preset amount of time. 
     
     
         31 . The method of  claim 27 , further comprising:
 recording a lap time during the counting step; and   generating an average lap time using recorded lap times.