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Digital weighing scale design using pic

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Saad_111

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Hi
I have a plan to design a digital scale using pic of range 0-2000 kg, but the problem is that there is not sufficient material on load cell and its signal conditioning circuitry. if any one have some supporting material, link or design, then please help me.

thanks
 

Saad_111 said:
Hi
I have a plan to design a digital scale using pic of range 0-2000 kg, but the problem is that there is not sufficient material on load cell and its signal conditioning circuitry. if any one have some supporting material, link or design, then please help me.

thanks
Click to expand...

You need a load cell, an instrumentation amplifier like AD620 and a PICmicro. Load cell rated weight are usually printed on its body and sensitivity can be found from datasheet. But the common value for sensitivity is 2mv/V. For example, a 75kg load cell with 2mv/V sensitivity means that the load cell will give 2mV when exitation voltage is 1V and it is loaded with 75kg. Common exitation voltage is 10v. So for this exitation voltage this load cell will give 20mv when loaded with 75kg. Probably you should not need 2000kg load cell. The weighing scale has some mechanical mechanism which reduce and concentrate all it distributed platform loads into a single point where the load cell is.
 
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