Design of Coulombmeter of Different
Functions Base on MCU and
Special Chips
Abstract
With the knowledge of the MCU and the electric meter of special purpose (ATT7021) and certain designing directive, this design provides a circuit of hardware with suitable parts and makes use of the translation of the programmer to achieve the anticipated function. The core chip is designed as ATT7021, base on which the electric meter of electronics is awarded the characteristics of simple peripheral circuits, high reliability, good linearity and fine stability, as well as the application of measuring the quantity of the electric energy for the users of the single-phase-two-section electric system. The central controlling part is designed as the STC89C58RD MCU, which counts the pulse and makes the chip MAX7219 to indicate it. And the LED goes to seven-section digital tube of 8 bits, which can conveniently observe the value of the electric quantity. The serial circuit RS-232 is connected to the computer to revise and debug the programmer, enhancing the performance of the product designed.
Keywords: STC89C58RD, ATT7021, MAX7219, Functional electric meter