In this post I have explained an easy method of upgrading your existing car fog lamp switch such that it allows toggling both the fog lamp as well as the DRL lamps alternately, as per the owner's requirement. The idea was requested by mk karthick.
Circuit Objectives
- Am looking for a circuit which is directly connected to the fog lamp output from car dashboard. The circuit will control Fog and DRL lamps together with single switch, and do switching to my response without modifying the old switches in my vehicle.
- Car-Fog light when switched one time ON and OFF, will switch ON the fog light continuously,
Car-Fog light when switch two times ON and OFF the fog light is supposed to go off and DRL LED illuminate and stay ON continuously. - I want to reduce extra control switches & cable loops inside my car. Please help me a with a suitable circuit design. thanks in advance.
The Design
The proposed single switch fog light and DRL light can be witnessed below. It uses a single IC 4017 for the required operations. The IC 4017 is used for sequentially changing the switching operation through a single input toggling, thereby allowing two different lamps to be operated using a single existing car dashboard switch
How it Works
The main purpose of this DRL and Fog light changeover circuit is to allow a single switch operation for selecting the fog light and the DRL light in tandem, without having to depend on any other external switching arrangement.
Here when the fog switch is first turned ON and OFF, the fog light is switched ON. On a subsequent ON and OFF of the fog switch, switches OFF the fog light and turns ON the DRL lamp, on further toggling, the fog light yet again switches ON extinguishing the DRL.
In order to reset the system, the fog light switch could be held in the ON position for a couple of seconds. This will reset the whole circuit so that a fresh cycle could be initiated, although this may be never be necessary, since just a couple of simple operations are involved in the system.
It must be noted though, that the selected lights will be flipped-over and continue to remain ON, only while the fog switch is in OFF position. Keeping it ON will switch OFF the circuit and the lamps permanently.
Parts List
Resistors are all 1/4 watt 5%
10K - 6nos
100K - 1no
Capacitors, 1uF/25V, 10uF/25V, 100uF/25V - 1 no each
Diode 1N4007 - 2nos
Transistors
BC547, BC557 - 1 each
TIP122 - 2nos
IC 4017 - 1no
I had given +ve supply from battery to the fog ,drl and BC557 and battery negative to the switch which goes through 1N4007
But it not works can you let me in details where to give the battery positive and battery negative if any mistakes as am doing
Please reply me on it to make it work
Are you getting voltage across the 100uF/25V capacitor, please check it and let me know?
Also, remember, the output of the 4017 will shift only when the fog switch is turned ON and then OFF alternately…
i had tried this circuit but it wont work as i had used 6V x 2 nos LED in series but there is no any output the pcb i had made as shown in the above circuit can you guide me to solve it
I can surely guide you.
Can you please tell me, what exactly is happening in your circuit.
Remember that the switch marked as “FOG switch” must be in OFF position to ensure the circuit works, if it is in ON position then the circuit will be turned OFF.
As I tried but still not working as I given positive to led fog and drl positive and negative to ground but it’s not working
Please let me know to make it working
Did you check the voltage across the pin#16 and pin#8 of IC 4017?
Please check it and let me know if it is available or not?
Thank you for your kind feedback, appreciate it!