A low-cost and high-precision electric energy measuring device based on STM32 is designed and implemented

which is mainly realized by hardware circuit and embedded software.Design and cost control of high-precision electric quantity signal sampling

switching input

switching output

and remote communication under ModBus-RTU protocol are mainly expounded.Up to now

the device has been applied in engineering.The application results show that the device meets the requirements of industrial level

runs stably and reliably

has good versatility

high measurement precision

and has strong practicability and popularization value.