Hi Adel,

It wouldn't surprise me if a mass-produced digital bathroom scale is built like a calculator, that is, with no easy access to what you're looking for.

Or it could be built like my automatic bread maker, it will have its own uC. You will have to figure out who makes it, then find a datasheet so you can figure out what pin is what...basically reverse engineer the design.

What are you trying to do? Automatic datalogging?

Dennis