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Thanks to reply and give me some usefull link. From there, many links that relation with weighting i got.
As i read, almost weights system using load cell - using strain gauges. I have an idea to make a weights system that not using strain gauge, but air pressure. So, to measure some weight, i am using pressure sensor, not weight sensor anymore.
Anyone can give me some comment about the system that i want to build? That system can be cheaper than load cell system. I think i can build some cheap weights using it.
If you will use air pressure then you will have some additional error caused by atmospheric air pressure changing, by your height position above sea level, and by temperature changing. All these outer parameters can change in wide range and your weights result will depend on them.
For opposite example, strain gauge sensor does not depend on all these parameters, and can has additional temperature compensation.
I am also convinced that measuring weight by measuring pressure is, although possible, not a very good idea.
After all strain gauges are inexpensive devices and are commonly used in a wide range of applications, particularly in mmeasuring weights.
Obviously the choice is yours ..
Regards,
IanP
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