Design of an Alarm System with Capacitance Induction
Qingfan Shi · Physical Experiment of College · 2011
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.