The Development of a Closed-circuit camera Error Alarming System Using Current Detection Technique

摘要

In the present study, a system that gives an alarm to a user when an error occurs to a closed-circuit camera using current detection technique was developed. In existing error detection methods, recorded data on a DVR are checked or real-time monitoring is used to find errors in a camera. Therefore, it takes a considerable amount of time to find the source of error. The error alarming system developed in this paper enables easy detection of errors with the naked eye or an alarm sound. The detection circuit was designed for maximum current of 0.5W or 1A and using an A/D embedded with 10bit MCU. The current was set to the reference level using a potentiometer. A 2-color LED was used to monitor voltage and current status; When it is normal, it turns 'green' and when it is not normal; it turns 'red'. When error occurs to a camera alarm buzzer flickers every 0.5 second with a loud sound. This system was designed in 4 channel modes by the number of cameras connected to the system: 1-channel, 4-channel, 8-channel, and 16-channel.