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Home | Map | Projects | Construction | Soldering | Study | Components | 555 | Symbols | FAQ | Links Light-sensitive Alarm Project A kit for this project is available from RSH Electronics . Download PDF version of this page The circuit detects a sudden shadow falling on the light-sensor and sounds the bleeper when this happens. The circuit will not respond to gradual changes in brightness to avoid false alarms. The bleeper sounds for only a short time to prevent the battery running flat. Normal lighting can be used, but the circuit will work best if a beam of light is arranged to fall on the light-sensor. Breakingused, but the circuit will work best if a beam of light is arranged to fall on the light-sensor.... View Full Document

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