Research And Implement Of The Intelligent Hair Perming Device

Along with the increasing of consumption capability of people, they now pay more attention to hairdressing. Enlarging market will speed up the development of hair perming device.With a view to the disadvantage of hair perming device on the market, a distributed intelligent hair penning device based on a digital-output temperature and humidity sensor and embedded system is proposed. The hardware circuit and software program of this new-type intelligent hair perming device is researched, designed, and finally implemented in this thesis. A single-chip, digital-output sensor is used which communicate with MCU through 2-wire serial interface to improve measurement precision of temperature and humidity, MCU drives the LCD directly instead of using special driver ICs to reduce the power consumption of the system,. The zero-cross switching mode of thyristor in power-control circuit is selected to reduce the radio interference to other circuit. The fuzzy-control scheme which is used in the temperature control is very simple, meanwhile the control effect is satisfactory. To take advantage of strong function of a PC, a wireless communication network is constructed through which a set of intelligent nodes are connected to a PC to form a distributed measurement and control system. To improve sysem communication reliability, principle and implement of CRC (Cyclic Redundancy Codes) error detection algorithms, a communication error detection method in common use, is studied in detail in this thesis also.This thesis consists of 8 chapters: The first chapter introduces the principle of perm, the basic function and research background of a hair perming device and innovation of the thesis. In the second chapter, the basic function and principle of a new-type intelligent hair perming device are systematically described. Chip selection and program language selection are explained. The third chapter discusses the display and dynamic driver principle of LCD of intelligent hair perming device. The hardware circuit and software of display unit are discussed in detail. The fourth chapter describes the specifications of a single chip relative humidity and temperature multi sensor and timing of its 2-wire interface, introduces in detail the design of information collection unite based on SHTIO, discusses the source of error in temperature and humidity detection; The fifth chapter introduces design of...