| The purpose of this paper is to offer a set of intelligent instrument system with low cost. The design project in the paper is divided into two parts: the function generator and the metre time and frequency.Basing on AT89C52 MCU and using direct digital synthesis and electron measure, the system of the function generator and the metre time and frequency is studied . The function generator designed in the project can output wave single whose amplitude,offset and frequency can be adjusted. The wave single also has high quality. The metre time and frequency is designed basing on digital measuring. It has high precision,wide measuring scope and can display intuitionisticly, measure rapidly and make measuring process automatable.Design project of function generator and metre time and frequency is given firstly in the paper. The structure and main function of all parts of hardware electrocircuit is also introduced in the paper. The hardware electrocircuit design and software programme of function generator and metre time and frequency is introduced separately. In design of the hardware electrocircuit, the working theory and the idiographic function of all parts of function generator and metre time is introduced detailedly. In design of the software, the programme thought of all parts of the hardware electrocircuit. At the same time, the flow chart is given detailedly.The design of the hardware electrocircuit and the software programme of electrocircuit controlled by MCU of the whole system. The matrix keyboard is used to control the system and the 0CM4X8C LCD is used to display all of the variables. |
