| Pitch Speed more info |
|||
| Internal
vs External storage The app will always save the pitch speed to a history file in internal memory. If you have enabled external meory (sd card) in settings, history will also be saved on the sd card. Since we are saving to two locations, it is possible to create some inconsistencies if we're not careful. If you have saved some speeds to internal memory, and THEN enable the sd card, only the speeds that are recorded after you enable the sd card will appear in the sd card history. This won't create any problems for the app. But this may lead to confusion for the user. If you delete history - with external memory enabled - both files will be cleared. GMAIL Pitch speed app will allow the user to email history using GMAIL or any other installed email app. GMAIL has a unique characteristic. It will not permit attachment of a file to an email if that file is located in internal memory. So - if you wish to send an email via GMAIL, you must have 'use external memory' selected in preferences. If you try to use GMAIL, but do not have external storage enabled, GMAIL will send the email, but there will be no attachment. Calculation. The calculation used for determinination of speed is very simple. Speed = distance divided by time. If mound distance is set at 60.5 feet, and the app measures 1 second between release and catcher's mitt. the speed is 60.5 ft / 1 sec = 60.5 feet per second. To convert this to miles per hour: 60.5 feet/sec x (1 mile / 5280 feet) x (3600 sec / hr ) = 41.25 miles/hour Accuracy The math calculations are very accurate. The android phone operating system is fast enough to not introduce any signifcant eror. Accuracy is limited by our ability to press the button at the correct instant to capture the action. Several techniques that can improve accuracy. 1. Realize that the distance used in the calculation is the distance from rubber to home plate. Try to catch the action at those two points. 2. Study your pitcher and catcher. If pitcher release point is three feet in front of rubber, and you find it easier to react to his release point, then use a custom distance to shorten the mound distance by the appropriate ammount, Same for the cactcher - if she is two feet behind the plate, and you find it easier to react to the sound in the glove, add two feet to your custom distance. 3. Practice button presses Find a clock that clicks every second, use it to work on your button press action. Set your mound distance to 60.5 feet. A 1 second interval should result in a pitch speed of (60.5 feet / 1 sec) x (1 mile / 5280 ft) x (3600 sec / hr) = 41.25 mph Press the speed button as the clock ticks, press again on the next clock tick. You should display 41.3 mph if your timing is correct. Practice until you can consistently come close. 4. Practice at an MLB game If you are lucky enouh to be able to attend an MLB game where they display speed from a radar gun, compare your results to the radar gun value, use the feedback to adjust your press timing, and maybe your custom distance as mentioned above. Add plenty of comments This is really useful for coaches. Insert a comment to indicate inning change, batter change, whatever will help you analyze the results later. Your comment will appear directly in-line, between recorded pitch speeds. Other uses. Since custom distances can be used, you can calculate average speed for anything that moves as long as you know the distance between two points. - Check the speed ofyour six year old as she runs between the 60 ft bases. - Check your car speed between two hiway mile markers 5280 feet apart.
|