Design of DC Electric Parameter Measurement System

For electric parameters measurement and facilitation, through the study of control and theory of power parameter measurement, design a kind of take alarm device can measure the voltage and current at the same time power three electricity parameters of simple measuring instrument, the measurement system uses single-chip microcomputer as the main control unit, using ADC0832 as voltage acquisition chip, through multiple harmonic oscillation circuit resistance is converted into frequency, again by resistance transformation to calculate the current, finally calculated by single chip microcomputer power displayed on the LCD screen. Alarm circuit by relay all the way and the light-emitting diode (led), as well as of the horn, when an ADC chip, the detection of voltage, current, or power more than setting the maximum threshold, can make the I/O mouth into a low level, Triode and relay conduct, led and horn line pressure drop resulting alarm, through simulation and experiment validate the correctness and feasibility of the design.