Hi Marius.  I don't have a strategy for converting the range reading to cm; 
I just use an app to read the values and use measuring tape.  However, I 
would use the sensor's datasheet to see the relationship between the 
sensor's voltage (which can be returned with 'getVoltage()') and the 
distance.  Page four of the datasheet has a chart showing that 
relationship: http://www.sharpsma.com/webfm_send/1208

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