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I developed an interface program for the Arduino to read out a scale. There is no additional electronics needed, just two wires between the internal scale electronics and the Arduino.
See more here:
http://www.avdweb.nl/arduino/hardware-interfacing/scale-interface.html

Arduino scale output to the screen:

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<p>Nice work avandalen ! - I would like to discuss a product proposal with you. Can you modify this scale to weigh max value of 75 kgs, and give a relative % value display against this max value ie all values on the display will be &lt;= 100% ? my email is prabhu9484@gmail.com</p>
A nice idea about producing <a href="http://www.weighbill.com/weighing-scale/weighing-scales-for-stores/igx-weighing-scale/" rel="nofollow">Digital Weighing Scale</a>.

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