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Using the INA125P instrumentation amplifier with a load cell
Bissett
5
I Graduated from the University of Bradford with a degree in Chemistry and Forensic Science and currently I am studying towards a HND in Electronic and Electrical Engineering while interning at AB Open.

Comments

July 29, 2019 10:43

hi, are there new developments, im going to build this .
I see questions about noises.
but i must also make a convertion to 4 - 20 ma.

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December 18, 2018 16:45

Great Work! I like your approach.
Pretty soon I will hopefully also do experiments with the Raspi.

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April 19, 2017 14:49

Note that your outputs are outside the linear output range of the INA. The spec. at page 2 in the data sheet says typical from 0.4 V to 3.3-0.9= 2.4 V. The pin 5 can be used to adjust the output to be within this range if driven from an zero ohm source. The 100 ppm/K gain drift of the circuit will make a 0.01kg drift for a 100kg (bed and patient) if the temperature changes 1 K. Real scale instruments for load cells are often less than 2 ppm/K

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April 5, 2017 07:10

Have you had problems with noise. This can be a problem with small signals.

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April 5, 2017 07:10

Nice work. Do you need to constantly re-calibrate the load cell due to 'creep'? I guess this could be done when the patient gets out of the bed?

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