This paper discussed the design principles of IPC realtime control keyboard meeting the requirements of automatic asphaltum and concrete paver, and then described the hardware and software scheme of the special control keyboard for LTU125A automatic asphaltum and concrete paver.
The thesis is about the design of the hardware and software, the hardware design mainly includes the interface design of AT89C51 and 8155H, interface design of 8155H and SMG12864A, the connection of AT89C51 and relays controlling motors and the controlling keyboard design.
The function of the mainframe section is setting and storing parameters,processing information, controlling keyboard and transmitter, giving an alarm for thefaults, displaying and Printing the information such as fiow and volume, and so on.
The research and realization of a kind of samrt phone time-recorder are introduced,whose top management chip,one-chip computer AT89S51,can distinguish the different signal sound of the telephone and the decode message of MT8870 through CR6230 distinguishing circuit for received phone signal and sound to achieve the purpose of writing down call message for human-computer interaction controlled by keyboard for users' information inquiry.
The equipment was composed of main unit that could work in multi frequency, several kinds of hand-pieces and control keyboard.
The basic operating principle of a system of flow measwrernent and control with an MCS-51 one-chip computer is introduced in this paper, and the structure of hardware, the design methods of software system are also expounded. The system can complete the functions of keyboard control, real-time measurement, calculation, display, print, alarm, communication and auto reset of interference.