无锡科技职业学院毕业设计（论文）
基于单片机的多功能电表设计
Electricity automatic controller
Abstract：Along with the material life of the rich, many people move into the
city, as the 1 part of your life. We use FM3307\/8 microcontroller as the core of the 8
households electricity consumption measurement, let everyone know what how to use
single chip microcomputer to measure the amount of power. 8 pulse output electric
energy metering chip AD7755 to the residents of the electricity into a certain number
of pulses. 74HC164 series input and output 8 bit shift register and LED monitor can
display real-time circulation of 8 households of electricity. AT24C16 through the I2C
bus and the singlechip is connected with the MCU will residents consumption
real-time write AT24C16 when power AT24C16 can still save the data once again
after power on the MCU will save the data read "in order to achieve power-down
protection. Electric energy meter through the RS-485 bus and the concentrator is
connected to receive the meter reading concentrator reading or prepaid, reset
command. Meter reading concentrator has GPRS communication module MC55 to
realize data ， the upload or command through GPRS communication network and
center computer connection "issued.
When working, voltage through the resistor divider, a current through the current
transformer in the sampling resistance after sampling, into the special power chip for
processing, and converted into digital signal is sent to the CPU calculation. Due to the
adoption of a special power chip, the voltage and current sampling resolution is
improved greatly, and have enough time to more accurate measurement of electric
energy metering, so that the electric power meter accuracy has been significantly
improved. CPU is used for time-sharing charging and processing a variety of input
and output data, the special power chip via the serial interface to read data, and
according to the preset time complete the time-sharing active electric energy metering
and demand maximum measurement function, according to the need to display the
data communication transmission, infrared or RS485 interface, monitoring and
operation parameters store all kinds of data, records. Let the computer according to
the different price of electricity time division point of the realization of multi-rate
