Hi there,
How can i detect weight in range 12g to 50g, is there any sensor can do it ?
Yes, a load cell.
Do you want to detect a weight, or measure the weight ?
To detect a weight, perhaps some kind of foam or spring with magnet and hall sensor. Or even a FSR (Force Sensitive Resistor) might work. Maybe a IR detection.
To measure the weight, a load cell is the best.
i saw the features of FSR its range was 100g - 10 kg and i did not find any of it with the lower range (12g-50g)
is the load cell can sense the low weight as 12g to 50g for sure ??
Yes, for sure.
If you need to measure up to 50g, then you need a load cell that can do 50g (or 100g or even more).
Google for : load cell 100g
For a load cell, you need an amplifier.