headlights timer

This device is a simple timer that keeps the headlights of a vehicle illuminated for approximately 1 minute and 30 seconds. This feature is particularly useful when accessing dark areas, eliminating the need to return to manually switch off the lights.

The circuit design for this timer can utilize a 555 timer IC configured in monostable mode. The 555 timer will control the duration for which the headlights remain on after activation. The circuit can be initiated by a momentary switch, which, when pressed, triggers the timer.

In this configuration, a resistor (R) and a capacitor (C) determine the timing interval. The formula for the time delay (t) in seconds is given by:

t = 1.1 * R * C

For a desired delay of 90 seconds, suitable component values must be chosen. For example, a capacitor of 1000 µF and a resistor of 82 kΩ can be used, as this combination yields a timing interval close to the desired 90 seconds.

The output of the 555 timer can be connected to a relay, which in turn controls the power to the vehicle's headlights. The relay must be rated to handle the current drawn by the headlights. A diode should be placed in parallel with the relay coil to protect the circuit from back EMF generated when the relay is de-energized.

Additionally, a power supply circuit can be included to ensure the timer operates independently of the vehicle's main battery, using a small rechargeable battery or a capacitor bank. This ensures that the timer remains functional even when the vehicle is turned off.

Overall, this timer circuit enhances vehicle convenience and safety by allowing headlights to remain on for a predetermined duration, providing illumination in dark areas without the need for manual intervention.This device is a simple timer, allowing to keep on the headlights of your vehicle for about 1min. and 30sec., e.g. when accessing some dark place, without the necessity of coming back to switch-off the lights.. 🔗 External reference