利用电容器的电容值随着极板间介质介电常数而变化的物理性质,设计制作了一种隐蔽式防盗报警系统。其中应用555无稳态振荡器产生随电容值改变而变化的方波信号,经由单片机处理后送至报警器,最终完成监控报警的作用。系统设计简洁精巧,实现了报警系统优良的隐蔽性,误报率低,稳定性与可靠性良好,适应性强,具有广泛的应用前景。
An alarm system is designed by using the principle of capacitance change.Frequency of square wave signal of 555 circuit changes with capacitance of changes,and then is sent to the alarm after MCU processing.This design is ingenious,covert,accurate and efficient.The system has broad application prospects.