How to Build a Simple Automatic Street Light System

There have been lot of problems in street lights. Major problem in some places is every evening a person has to come and switch ON the street light and it should be again switched off in morning.  

So this problem can be overcome by using a simple circuit. Below shown circuit will be automatically switched ON and OFF during night and morning times respectively.

                     

                        **SIMPLE CIRCUIT**

                      

                      1.circuit diagram (using resistance &transistor bc547)

                                                                                                                                                                                                                                                                                                                                                                                                                   COMPONENT LIST:-

         1. R1,R3-330ohm

        2. R2-1Kohm

             3. Q1,Q2-BC547

4.  LDR

5. LED

6  BAT

2.Circuit Diagram (using LDR  sensor & IC 555)

COMPONENT LIST:-

1. 9v Battery with strip

2.        Switch

3.  L.D.R (Light Depending Resistance)

4.  I.C NE555 with Base

5.  L.E.D (Light Emitting Diode) 3 to 6 pieces.

6.  Variable Resistance of 47 KΩ

7.  P.C.B (Printed Circuit Board of 555 or Vero board.

                 

                     **COMPLEX CIRCUIT DIAGRAM**

 1.Circuit diagram  (using ic 555)

COMPONENT LIST:-

Resistors (all ¼-watt, ± 5% Carbon)

R₁ = 10 KΩ/10-watt

R₂ = 33 KΩ

R₃ = 39 KΩ

R₄, R₆, R₇ = 10 KΩ

R₅ = 100 Ω

C₁, C₅ = 0.1 µF

C₂ = 1000 µF/25V

C₃ = 10 µF/25V

C₄ = 0.01 µF

IC1 = NE555 timer IC

T₁, T₃ = BC548

T₂ = 2N2222

ZD₁ = 9.1V/0.5V

D₁ = 1N4001

Triac₁ = BT136

LED₁ = RED color

LDR₁ = light-dependent resistor

F₁ = Fuse, 5A

B₁ = 100W/ 230V AC

SW₁ = On/off Switch

2.Circuit diagram (using TRIAC BT136)

 

COMPONENT LIST:-

1. R1-60KΩ(1/2 watt)

2. R2-1KΩ

3. D1-1N4001

4. C1-100UF/16V

5. Q1-558

6. Q2-548

7. TRIAC(BT136)

8. 9V BATTERY OR TRANSFORMER

9. LDR 

3.Circuit diagram (using RELAY)

COMPONENT  LIST:-

1. R1, R2, R3 = 2K2,

2. VR = 10K preset,

3. C1 = 100uF/25V,

4. C2 = 10uF/25V,

5. D1 ---- D6 = 1N4007

6. T1, T2 = BC547,

7. Relay = 12 volt, 400 Ohm, SPDT,

8. LDR = any type with 10K to 47K resistance at ambient light.

9. Transformer = 0-12V, 200mA