In principle, a weighing sensor is a pressure sensor with a different shape. However, there are usually many methods for sensing, but they are commonly used. For example, the ones used in weighing scales are generally eddy current type.

That is to say, he has an eddy current triggering winding, and then there is a sensor that senses the intensity of the eddy current. Due to the overall metal packaging of this weighing sensor, the eddy current is inside and undergoes deformation under pressure. The eddy current changes and can be read after amplification. Then, the material used to package this thing is usually rigid material, in short, ordinary metal, such as steel, but definitely not very soft things. Because even for steel, even if it deforms by a few micrometers under pressure, the changes in eddy currents are enough to sense how much has changed. Moreover, if it is a soft metal, it may be easy to encounter problems when weighing heavy objects. At least pressure sensors using eddy current sensing will not be made of soft metal.

The function of the weighing sensor detection circuit is to convert the resistance change of the resistance strain gauge into a voltage output. Because the Wheatstone bridge has many advantages, such as suppressing the influence of temperature changes, suppressing lateral force interference, and conveniently solving the compensation problem of weighing sensors, the Wheatstone bridge has been widely used in weighing sensors. Because the sensitivity of the full bridge equal arm bridge is the highest, the parameters of each arm are consistent, and the effects of various interferences are easily offset, the weighing sensors all use the full bridge equal arm bridge.