A delayed headlight lamp control for a vehicle permit one to enlighten the way on streets, and car parking, where there is no lighting. Additionally, it is also likewise called “Relay Delay”, it keeps the headlights turn ON for a pre-set measure of time in the wake of turning OFF the ignition.
The figure underneath shows a retrofit project of an automatic delayed turn-off vehicle headlights control circuit. The circuit will turn ON the headlights of your vehicle for a preset time span when you turn off the ignition switch. This capacity will be extremely valuable on occasion when you leave your vehicle in a dim spot and because of dim you can’t see the exit, so if the lights remain ON for 1 or 2 minutes you can without much of a stretch stroll on your way. Although numerous modern vehicles have this built-in facility, numerous vehicles don’t, and retrofitting a delay circuit like this is extremely basic electronic engineering.
Hardware Components
The following components are required to make an Automatic Car Headlight Circuit
| S.no | Components | Value | Qty |
|---|---|---|---|
| 1. | IC | NE555 timer | 1 |
| 2. | Transistor | 2N3904 | 2 |
| 3. | Resistor | 3.3kΩ, 2.2kΩ, 220kΩ, 270kΩ | 2, 1, 1, 1 |
| 4. | Variable resistor | 100K | 1 |
| 5. | Ceramic Capacitor | 0.1µF | 2 |
| 6. | Electrolytic Capacitor | 100µF | 1 |
| 7. | Relay | 12V | 1 |
| 8. | Diode | 1N4007 | 1 |
| 9. | Car battery | – | 1 |
NE555 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 555 Timer
2N3904 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 2N3904
Automatic Car Headlight Circuit
Working Explanation
The retrofit circuit is utilizing two transistors, one 555 timer IC, a 12V relay, and some other discrete components. Working of the circuit is quite basic, when the vehicle ignition is turned off the transistor Q1 additionally becomes switched off because of which the Q2 lead and triggers the 555 timer IC for a preset timeframe. At the point when the 555 timers is turned off its yield goes high and switches ON the 12V relay consequently the headlights actuate. The preset timeframe can be chosen with the 100K variable resistor. The preset timeframe can likewise be expanded by expanding the estimation value of capacitor Cx2.
The three affiliation centers that appear in the circuit ought to be associated with your vehicle’s dashboard lights, adornment power, and chassis, you will likewise discover these associations in your vehicle’s cigarette socket. For good outcomes fit the circuit in a reasonable enclose area and put the variable resistor out so you can easily modify the OFF timing.
Applications and Uses
- It is exclusively an application-based project used to delay the off timing of car headlight ON timing to illuminate dark pathways.
