Smart Headlight Automation Circuit using IC 555 turns ON the car light by itself when dark, it uses LDR to check light outside and 555 IC decide when light turns ON.
Also, this circuit saves power, make car light work at right time and help driver be safe at night.
Circuit Working:
Parts List:
| Components | Quantity |
|---|---|
| Resistors | |
| 4.7k 1/4 watt | 1 |
| LDR | 1 |
| Preset 100k | 1 |
| Capacitors | |
| Ceramic 0.01µF | 1 |
| Electrolytic 10µF 25V | 1 |
| Semiconductors | |
| IC 555 | 1 |
| Transistor BC547 | 1 |
| Relay | 1 |
| Diode D1 1N4007 | 1 |
| On / Off switch | 1 |
| Battery 12V | 1 |
In this circuit LDR and VR1 make voltage divider and light changes voltage at point between LDR and VR1.
Further, more light means LDR low resistance with low voltage to 555 IC. and less light means LDR high resistance with voltage to 555 IC goes up.
Then 555 IC checks if voltage passes the limit and if yes then output from 555 IC goes high; after that high output turns ON the transistor Q1 BC547 through which the current flows in relay coil.
Now relay closes N/O contact with headlights turns ON and diode D1 1N4007 protects parts from reverse voltage when relay turns OFF.
How to Build:
To build a Smart Headlight Automation Circuit using IC 555 follow the below mentioned steps for constructions:
- First, put all parts as shown in circuit diagram.
- Next, pin 1 of 555 IC connects to GND.
- After that, pin 2 of 555 IC connects between LDR and center leg of VR1.
- Then one side of LDR connects to +12V and other side of LDR connects to pin 2.
- Now center leg of VR1 also connects to pin 2 and other leg of VR1 goes to GND.
- Also, pin 3 of 555 IC go to base of transistor Q1 BC547.
- Further, pin 4 and pin 8 of 555 IC connects to +12V.
- Pin 6 and pin 7 join together and then add resistor R1 from +12V to this point and also, connect capacitor C1 here.
- Finally, anode of C1 connects to pin 6 and pin 7 join and then cathode of C1 goes to GND.
Relay coil:
- One side goes to Q1 collector.
- Other side goes to +12V.
Diode D1:
- D1 Cathode connects to +12V and anode connects to Q1 collector same as relay coil.
Headlight connects between relay terminals:
- Connect one end of the headlight to the relays COM (common) terminal and the other end to the relays NC (normally closed) terminal and then connect the circuit in series with the 12V power supply.
SW1 switch:
- Switch SW1 one side connects to +12V battery, other side connects to +12V line in circuit and battery negative goes to GND.
Conclusion:
To conclude, the 555 timer IC-based Smart Headlight Automation Circuit provides an efficient solution by using an LDR to detect ambient light and turn ON the headlights only when it gets dark.
The circuit saves power, extends bulb life and automates our lights, making driving safer and more convenient.