Sensor circuit 4
The circuit design employs a 555 timer configured in monostable mode, which is ideal for detecting changes in the environment. The motion detection mechanism can be achieved using a passive infrared (PIR) sensor, which senses infrared radiation emitted by objects in its field of view, typically human bodies. When motion is detected, the PIR sensor sends a signal to the 555 timer, triggering the circuit.
In the schematic, the 555 timer's trigger pin (pin 2) is connected to the output of the PIR sensor. A resistor-capacitor (RC) network is used to define the time duration for which the LED remains lit and the alarm sounds. The values of the resistor and capacitor can be chosen based on the desired delay time; for example, a 10kΩ resistor and a 100µF capacitor will yield a delay of approximately 1 second.
The output of the 555 timer (pin 3) connects to both an LED and a small piezoelectric buzzer. A current-limiting resistor is placed in series with the LED to prevent excessive current flow, ensuring the LED operates safely. The piezoelectric buzzer is capable of producing a loud sound, alerting nearby individuals of the detected motion.
Powering the circuit can be achieved using a standard 9V battery or a regulated power supply, ensuring that the voltage levels are compatible with the 555 timer and other components. Additional features, such as adjustable sensitivity of the PIR sensor and a reset mechanism for the timer, can be incorporated to enhance functionality.
Overall, this motion detection circuit using a 555 timer is a practical solution for security applications, providing both visual and audible alerts in response to motion in the monitored area.The primary goal for this project is to utilize the 555 timers to detect a motion in the nearby environment. The output of this circuit will light LED and make an audible sound like an alarm. 🔗 External reference
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