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What is Fridge Door Alarm Wiring Diagram about?

This circuit diagram summarizes a fridge door alarm that uses a 7555 or TS555CN timer IC and piezo sounder to create an intermittent beeping sound when the fridge door is open. When the door is closed, a photo resistor keeps the timer IC from oscillating by fully charging a capacitor. When light enters from an open door, the photo resistor lowers its resistance and allows the timer IC to oscillate, enabling a second timer IC to drive the piezo sounder to beep approximately 5 times per second for 17 seconds

Author

Mohammed Hakeem Uddin

Language

EN