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