Abstract：In China, the scale has been used for more than two thousand years has the history of the earliest steelyard, platform scale, scales, such as text. However, with the advancement of our society, the development of e-science, we require the use of scale is easy to operate, easy to identify. Therefore, we need to develop a high-precision digital electronic scales. The task is to design a circuit, can be achieved and be able to detect the weight of its digital display. Measurement circuit is the most important component of resistance strain sensor, the signal is detected through its use of full-bridge measurement circuit of detected signals are processed, the system error resulting from a smaller, more accurate output data, and then through three transported to the sensor output amplifier weak to carry out a certain multiple of analog signal amplification, and finally, after A / D conversion into single-chip signal processing and liquid crystal display with LED has been shown that the quality of objects. This design of digital electronic scales with a small error and high precision, the advantages of easy measurement.
Keywords: Single-chip microcomputer; digital electronic scales; resistance strain sensor; full-bridge measurement
