Door Alarms
The described circuit functions as a touch-sensitive alarm system designed to enhance security at entry points, such as doors. It utilizes a capacitive touch sensor that detects the presence of a hand near or in contact with the door handle. Upon detection, the circuit triggers an audible alarm and visual indicator.
The main components of the circuit include a capacitive touch sensor, a microcontroller or comparator circuit, a piezo buzzer for sound output, and an LED for visual alert. The capacitive touch sensor generates a signal when it senses a change in capacitance caused by a human touch. This signal is processed by the microcontroller, which activates the piezo buzzer and the LED.
The circuit can be powered by a standard DC power supply or batteries, ensuring flexibility in installation. To prevent false alarms from environmental factors such as wind or rain, the sensitivity of the touch sensor can be adjusted. Additionally, a timer function can be implemented within the microcontroller to control the duration of the alarm, allowing for customization based on user preferences.
For installation, the touch sensor should be positioned appropriately on or near the door handle to ensure reliable detection. The buzzer and LED can be mounted in a visible location to provide clear alerts to nearby individuals. Overall, this circuit serves as an effective deterrent against unauthorized access, offering both auditory and visual warnings when the door handle is engaged.This circuit emits a beep and/or illuminates a LED when someone touches the door-handle from outside. The alarm will sound until the circuit will be switched-off.. 🔗 External reference
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