Distance Sencor
Distance Sencer is 5V device but output voltage up to 3V. So you can directry connect to "White Wizard Base Borad".
Connect it to A/D pins,(pin number is 15 - 20) on White Wizard Base Board.
Test program on mbed site
This is a GP2Y0A02YK (Detection range : 20 to 150cm) with male pinheader.
Be careful about misleading cable color. Center is GND. 
see datasheet
This is a example, mount it on the TANK.
Shopping site (comming soon)
