This paper mainly discusses the design of a meteorological sensor which is based on 32-bit ARM microprocessor LPC2101, involved in the research of key technologies and the realization of the program.

The work principle of every part of microprocessor is analyzed, and a strong emphasis is laid on the design of program counter, instructions decipher, execute unit, register group and control center.

This paper describes the application of microprocessor in digital control sewing machine. Mathernatical model, program flowchart, interface design and improvement ideas are given.