measuring time elasped between button presses in milliseconds

duffling

I have written a routine that does this already but im wondering if someone has a better more accurate routine

basically im working out Beats per minute with the user tapping the tempo with one button

my program enters a loop then calculates the difference between button press times to calculate the bpm

its ok .. but i need it to be more accurate ..im using the Button command to debounce the key input loop
this works well .. my way is not too elegent


i have not used the count command before .. is this a better way to do it ?

if someone can give me some tips this would be much app.


thanks!
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allanlane5

The BS2 is not too good on "absolute" time -- exact milliseconds. It's very good at "approximate" time -- delay from NOW for 10 milliseconds then continue.

Your 'non-elegant' solution may be the best one the BS2 offers. There does exist a 'co-processor' which will give you an exact 50 millisecond square wave that you can use to measure other events.

Jon Williams

The BUTTON command is probably overkill for what you're doing. To get an accurate time you could use the button to trigger a flip-flop and then use PULSIN to measure the flip-flop output.

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Jon Williams
Applications Engineer, Parallax
Dallas, TX· USA

MacGeek117

COUNT could work.
bugg

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But I canna change the laws of physics, Captain!