This is a cool scale mod. The Weight Logging Bathroom Scale saves the the time stamped weight for each use to an SD card. This allows the data to be plotted and analyzed. The method that the weight was taken from the existing digital scale platform is real interesting. The original LCD data lines were snooped on to determine what value is being displayed!
Thanks Jorge.
"First I thought that I could read the sensors and got an analog voltage relative to weight but I couldn’t find a way to do it. Next a friend at work give me the idea to try read the signals that went to original LCD, and it was a simple and easy way to have what I need 
The original LCD have 15 pins, 3 backplanes and 12 segments. I did understand how the LCD signals works reading this application note. The segments signals have voltage that can be read directly by the LPC2103. The backplanes signals can’t be ready directly by the LPC2103 (I think) and then I made a very simple voltage detector using a LM258 opamp so I get a "trigger" signal every time the backplane signal get near is maximum value."
