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Yet another factor alberto, If i need a VREF 10V I need to supply the INA125 which has a symmetrical voltage supply of +-15v? or it may be at +-10v..
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Comprehending load cells is actually a subject of mechanical, electrical and electronical knowledge and it will take a great deal of time (in actual fact now my job is educating this with the College). A quick, incomplete, but however useful and proper handbook for begginers Is that this one
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INA125P is simply a rail-to-rail differential instrumentation amplifier. To retrieve the system you ought to take the inner electric powered schematic and fix the amplifier circuit.
Effectively a 22k pot may be far too coarse for load cell calibration. You'll want to use a potentiometer with a minimum of 500 Ohm/rev precision, normally you will not get much too far.
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which I will convert to grains by way of a micro/software program, but I'll require a minimum of 0.01 gram accuracy. read more I've checked out the HX711 IC which appears to be promising, but I might love to Obtain your feelings, pitfalls and so forth. How would you Low Cost Learning Toys advocate creating a undertaking such as this? Thanks, Ben
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In truth the best choice, after you have described a superb amp acquire, is to interchange the potentiometer with a set resistor. As you reported, calibration need to be run all over again.
In such cases by plugging Ia_ref pin in the facility supply pin you make the IC believe that the ground is two.5V (so identified as pseudogrounding Procedure). That's the idea of all of it.
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(hint: I'll use and arduino As a consequence of attempt to make this function). Aiding me with that could be perfect for a starter like me. Thanks !