Hi,Thank you for your reply and is really helpful but I am still a bit confusing. All LM324 used in your circuit is to offset the output voltage?What is the output voltage range of your circuit?The Rg of your AD620 is adjustable depend what gain we want?I don't really need to show the weight, I just have to set a preset value and measure whether the object is under a preset value, so can I connect my circuit without LM324? If I connect the circuit shown in attached picture, my output voltage from AD620 is 1.67mV when there is nothing on the cell,is this the offset voltage?
hi,
Rg is adjustable for the Gain.The output range of my circuit is upto +3V
If you do not need to show the weight, why do you want to use an ADC/MCU.??
If you want a 'GO, NO GO' indicator you could use a much simpler circuit.?
If you use your circuit , you must connect AD620 pin 5 to 0V.
Also you will not get good results for very light weights.
Many load cells and OPA's will give you an offset voltage.
Have you made the load cell base and fixed to the load cell.??
this will give you a small +mV signal.
E.
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