AVR-Chat

if the projectile shows magnetic properties, may be
you can use another coil, through which the projectile
will travel, and the induced voltage can be recorded
by a peak detector circuit.


--- William Nachefski <slaphappysamy@yahoo.com> wrote:
> I need some way of measuring/displaying velocity of
> a projectile.  
> This is for my coil gun experiment.  Heres how I
> think I might go 
> about it.  Two matched pair IRdiode/phototransitor
> sensors, placed in 
> a tube one inch apart.  This tube is then slipped
> over the end of the 
> barrel. Use a AVR to start timing after first LED
> beam is broken and 
> stop timing after second is broken.  Then make some
> formula to calc 
> feet/second and display the result by either LCD or
> LED display.  Any 
> coments on what the code might look like.  Also
> which AVR Should I 
> use?  Could The Tiny serries handle this?
> 
> 


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