Hi ,
i have brought a digital bathroom weight scale and opened its casing to reach the internal circuitry ..
i found out there 4 load cells ( strain gauges ) at its 4 sides
there are 3 wires running out of each load cell
( RED BLACK WHITE )
I dont know what these each of these wires do ,,,
actually i am trying to connect this load cell to arduino
plz can u help me out with this ? thank u for the help in advance

 

They might be half bridges - http://www.sensorland.com/HowPage002a.html

http://arduino.cc/forum/index.php?topic=56429.0

 

A strain gauge is not a load cell.

A strain gauge is a device which registers a change in some electrical characteristic (resistance is very popular) when it is subject to mechanical strain.

A load cell is a mechanical device that produces a known strain when subject to a specific mechanical stress, thus indicating the stress. The measurement device may be mechanical or a strain gauge may be attached so the mechanical change is registered as an electrical one.

Most platform scales are cantilever devices with strain gauges registering the bending strains of the cantilever.

 

Measure the resistance between leads and report here. That may help us figure it out.