Hi all, I am looking for force sensor that is highly accurate for my experiment. I know that force sensitive resistor is a poor option while the load cell could be expensive. The range for my force sensor is somewhere from 0lb to 20lb with high accuracy and precision. If I am to buy a load cell, do you know how to calibrate it and how I can display the force value corresponding to the signal the load cell receive to the monitor?
Thank you in advance
Have you tried using Google?
I have contacted companies and it seems that there is no way I can measure force with high accuracy with less than $200
Here's a option I found with Google but it may depend on how much accuracy you require:
(you may need to devise a lever arrangement to measure up to 20lb)
This link was posted within this Arduino forum yesterday:
http://www.aliexpress.com/item/Parallel-Beam-Load-Cell-Sensor-50kg-110LB-Aluminum-Alloy-Material-Shielding-Cable/1082699513.html
10kg also available. Any good?
I draw your attention to the HX711 as used here:
http://www.dfrobot.com/wiki/index.php/Weight_Sensor_Module_V1
Thank you very much for your information. Can you explain it what situation I need the load cell module//amplifier? How does it really work? Do I need the load cell interface to make it work?
Thanks
e2738729:
Thank you very much for your information. Can you explain it what situation I need the load cell module//amplifier? How does it really work? Do I need the load cell interface to make it work?
Most load cells have four strain gauges arranged as a Wheatstone bridge. The change in output voltage is tiny, only roughly 1mV. You therefore need either a suitable amplifier (e.g. INA125P) or opt for a product that uses the HX711 which incorporates a 24-bit analogue-to-digital convertor. I believe the HX711 option is better because the analogue-to-digital convertors in an Arduino chip are only 10-bit as far as I'm aware.
(I have no experience of using load cells)
Thank you very much and sorry for the late response. I will try to work on this 