Friday, April 12, 2024

Arduino-Based Night Security Light

efy tested

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.

DIY Night Security Light System using Arduino
Fig. 1: DIY Night Security Light System on Breadboard
Components Required
Semiconductors:
– BC547 NPN transistorArduino board
D1– 1N4007 rectifier diode
Resistors (all 1/4-watt, ±5% carbon):
R1– 10-kilo-ohm
R2-R3– 1-kilo-ohm
T1, T2BC547 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

The circuit diagram of the Arduino-based night security light is shown in Fig. 2. It is built around an Arduino Uno board (board1), PIR sensor connected across CON2, two BC547 npn transistors (T1, T2), a 12V one changeover relay (RL1), small LDR (LDR1), a piezo buzzer (PZ1), a 60W 230V AC bulb connected across CON4, and few other components.



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