HOW A DIGITAL SCALE WORKS ?

Digital scales work with the use of a load cell. While analog scales use springs to indicate the weight of an object, digital scales convert the force of a weight into an electrical signal.

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Essential Parts of Scales

Its key components consist of a voltage meter, a device used to measure the voltage of an object, and a load cell sensor, an electronic device used to convert a force into an electrical signal.

A load cell is also known as a force transducer.
When an item is placed on the scale, the weight is first distributed evenly.
Underneath the flat pan of a digital scale you can find, for example, four slightly raised pins in the corners that serve to distribute the force of the weight evenly.
The mechanical design of the digital scale applies the weight force to one end of a load cell. As the weight is applied, the end of the load cell bends downward.
The force of a weight then deforms the strain gauge. The strain gauge can consist of metal tracks, or sheet, attached to a printed circuit board or other backing.
When the sheet metal is tensioned, the backing is flexed or stretched.
Conversion to electrical signal
Two weights measure 120 grams on this digital scale.
The strain gauge converts the strain into an electrical signal. Because the load cell has an electrical charge, as it moves down, the electrical resistance changes.
The resulting small change in resistance is converted into an electrical signal. The signal runs through an analog-to-digital converter, and then passes through a microchip that «translates» the data.
As a result of this final calculation, the numbers indicating the weight of the object appear on the LCD display of the digital scale.