Arduino-Based Night Security Light

This Arduino-based night security light can protect your home/office from thieves/intruders at night. The light glows when movement is detected in front of the PIR sensor. Simultaneously, a piezo buzzer also sounds.

Features of the Night Security Light System:

1. Automatic Activation: The light turns on when it’s dark and motion is detected by the PIR sensor.
2. Duration Control: Upon detecting movement, the light remains on for ten seconds. If motion is detected again within this time, the countdown restarts.
3. Daylight Sensing: The system remains off during daylight even if motion is detected.
4. Incorporation of a Piezo Buzzer: A piezo buzzer sounds simultaneously with the light to alert during intrusions.

Video Tutorial In English

Video Tutorial In Tamil

The prototype of the Arduino-based night security light system is shown in Fig. 1.

Components Required
Semiconductors:
– BC547 NPN transistor	– Arduino board
D1	– 1N4007 rectifier diode
Resistors (all 1/4-watt, ±5% carbon):
R1	– 10-kilo-ohm
R2-R3	– 1-kilo-ohm
T1, T2	– BC547 NPN transistor
Miscellaneous:
CON1, CON3,
CON4	– 2-pin connector
CON2	– 3-pin connector for PIR
PZ1	– Piezo buzzer
	– PIR motion sensor
	– LDR
	– Breadboard
	– Jumper wires
	– 12V, 1C/O relay
	– 60W, 20V AC bulb

Night Security Light System – Circuit

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