Abstract: In order to solve the problems of easy damage, low reliability and expensive replacement of traditional mechanical contact-based encoders, a design scheme of position encoder using contactless and inductive sensing is proposed. LDC1312 digital inductance sensor is used as the sensing probe to detect the rotating disk with metal. The digital quantity of the sensor is connected with the MSP430F5529 through the IIC interface, and the number of the pulse signal is processed by the MSP430F5529 to achieve the detection of the position of the rotating disc.Compared to the design of mechanical contact-based system, it has the advantages of high reliability, long life and for used in moisture, dust and other harsh environments.

Key words: Incremental encoder, Inductive sense, Detector