i want to interface these sensors to my arduino but i would like to know the voltage levels generated by the load cell or the HX711 controller ,otherwise how can i caliberate it ?
is this information known ?
You seem to be able to calibrate it by using a set of known weights!
Paul
You will need to calibrate it.
Calibration is a simple (albeit not always easy) process: take a known input, record the output. Do this for a series of different inputs. Having done this, you may now take an unknown input, you look at the output and can calculate the unknown input.
So for your scale: you need to have a number of known, different weights. Place weight on scale, record output. Place other weight on scale, record output. Make a graph of this - hopefully it's linear and you have an easy calculation to do measurements later. If not linear, you probably have to use as many calibration points as possible and use a lookup table and linear interpolation between points.