Design of High Precision Passive Meter Based on MSP430F1121 Microcontroller Unit

摘要

The design method and the hardware and software design scheme of two-wire meter with low power consumption is introduced. It solved the shortcomings of traditional two-wire meter which has low measurement accuracy and large temperature drift at high temperature. The meter uses the low power consumption single chip computer MSP430F1121, collects the two-wire loop current value, converses used 16bit ADC ADS8320, computes the value using compensation filtering algorithm, and finally displays the value data on the LED. The measurement accuracy reaches 0.1%. The experiments prove that the meter has low power, high accuracy, and reliable operation, and high anti-interference capability, stable and strong practicality. It could be became the development direction of two-wire meter.