LCD-LED DisplaySensors - Tranducers Circuits

Fog Lamp Sensor Schematic Circuit Diagram

For several years now, a rear fog lamp has been mandatory for trailers and caravans in order to improve visibility under foggy conditions. When this fog lamp is switched on, the fog lamp of the pulling vehicle must be switched off to avoid irritating reflections. For this purpose, a mechanical switch is now built into the 13-way female connector in order to switch off the fog lamp of the pulling vehicle and switch on the fog lamp of the trailer or caravan. For anyone who uses a 7-way connector, this switching can also be implemented electronically with the aid of the circuit illustrated here. Here a type P521 optocoupler detects whether the fog lamp of the caravan or trailer is connected.

Fog Lamp Sensor Schematic Circuit Diagram

If the fog lamp is switched on in the car, a current flows through the caravan fog lamp via diodes D1 and D2. This causes the LED in the optocoupler to light up, with the result that the phototransistor conducts and energises the relay via transistor T1. The relay switches off the fog lamp of the car. For anyone who’s not all thumbs, this small circuit can easily be built on a small piece of perforated circuit board and then fitted somewhere close to the rear lamp fitting of the pulling vehicle.

Tags

Related Articles

Leave a Reply

Your email address will not be published. Required fields are marked *

Check Also
Close
Back to top button
Close
Close
Read previous post:
Solar-powered Automatic Lighting Schematic Circuit Diagram

You’re doubtless familiar with the little solar-powered automatic lighting units found in DIY stores each year as summer approaches, sold...

Close