Today we have come up with a smart circuit, that is Night Activated PIR Motion Sensor. Therefore, it initiates its operation whenever the circuit experiences any movement in its range. Generally, this night-activated PIR motion sensor light circuit can actuate any AC or DC light when it detects any individual in the scope of 5 to 10 meters.
The circuit will consequently be enacted around evening time and go off in a day. Generally, the circuit utilizes for an assortment of security purposes. In the spot of light, you can likewise use any AC alert to actuate when distinguishing an unapproved individual.
Moreover, the utilization of this circuit isn’t restricted to just security-related purposes. However, it is likewise utilized for different purposes like programmed room light. Just like, it will be enacted automatically when you will go into the room. The circuit can also be used as a power saver via consequently turning OFF the apparatuses of your office.
Hardware Components
| S.no | Components | Value | Qty |
|---|---|---|---|
| 1 | IC | NE555 Timer | 1 |
| 2 | Transistor | 2N3906 | 1 |
| 3 | Transistor | 2N3904 | 2 |
| 4 | Triac | BT136 | 1 |
| 5 | PIR sensor module | – | 1 |
| 6 | LDR | – | 1 |
| 7 | Variable resistor | 100k | 1 |
| 8 | Resistor | 100 ohms, 10k, 1k | 1, 1, 2 |
| 9 | Capacitor | 0.1 uF, 470 uF | 1, 1 |
| 10 | Battery | 5V – 12V | 1 |
| 11 | AC lamp | 230V | 1 |
| 12 | AC adapter | 230V | 1 |
Circuit Diagram
Circuit Operation
Although, the fundamental component of the circuit is a PIR sensor module that is promptly accessible in the market. Meanwhile, this module contains some variable resistors. From which you can likewise change its sensitivity and timing. However, these subtleties can be found in the sensor guide that accompanies the module.
Meanwhile, the 555 timer IC is utilized to improve the initiation season of the 230V light. However, the timing of the circuit can be incremented by supplanting the 470uF capacitor with a higher value capacitor. Furthermore, the timing can be balanced with the 1M variable resistor.
The circuit is additionally utilizing a dark sensor that is worked around a 2N3906 semiconductor. However, a 100K variable resistor is used to change the sensitivity to find the darkness. Likewise, if you need to utilize the circuit for the day and not just for the night. Then you can evacuate the dark sensor phase of the circuit. Which likewise contains 2N3906, LDR, 100K variable resistor, and a 1K resistor. Moreover, it legitimately associated the circuit with flexibility.
Applications and Uses
Generally, PIR sensor lamps are mostly used to save energy by detecting the motion of humans, animals, etc. It is likewise used in security systems, PIR sensors light, street light projects, etc.
Additionally, areas of applications of PIR sensors are all outdoor light, Lift lobby, Common staircases, For Basement or Parking areas, Shopping Malls, For garden lights, etc.
