Realization of Multi Parameter Measuring Device Based on ATT7022E and STM32

This article introduces in detail a multi-parameter measurement device that can measure six-channel voltage, current and other information with the three-phase multi-function measurement chip ATT7022E, and can transmit the measured data to the high-performance ARM_Cortex_M4 microcontroller through the serial port of the STM32 single-chip microcomputer. This controller is equipped with an industrial Ethernet interface to connect to the Internet. In addition to the data acquisition part, it also realizes the remote configuration and precise control of the entire device. This article mainly introduces the content of the data acquisition part, including the acquisition of three-phase input and output Terminal voltage, current, active power, reactive power, apparent power, power factor and other parameters. Describes the design of this part of the hardware schematic diagram: including voltage sampling circuit, current sampling circuit, ATT7022E basic circuit, STM32F103RBT6 microcontroller basic circuit, serial communication interface and other circuit designs. It also describes the software calibration method, the realization of serial communication with the host computer ARM_Cortex_M4 microcontroller and the analysis of the measurement results. After experiments, the voltage is calibrated near the grid voltage, and the voltage value can reach the accuracy requirement within 0.5 level in the technical indicators of the power monitor.