This is example code for using the Adafruit liquid flow meters. 

Tested and works great with the Adafruit plastic and brass meters
    ------> http://www.adafruit.com/products/828
    ------> http://www.adafruit.com/products/833

Connect the red wire to +5V, the black wire to common ground and the yellow sensor wire to pin #2

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Written by Limor Fried/Ladyada  for Adafruit Industries.  
BSD license, check license.txt for more information
All text above must be included in any redistribution