DRL or Daytime Running Lights module

[NikolaSmart]

hi, I have bought DRLs and I want to do myself module for this...so idea is that DRLs are on when ignition is on, when lights are on DRLs are on about 20-30% and when ignition is off it has to have delay of shutting down for about 20sec....so does somebody have idea and can do schema for this module (circuit)

thank you

 

[Tony Stewart]

Use the tools you know best, a PIC, CD4060 or CMOS 555

Then choose hi side or lo side MOSFET with RdsOn <= 10% of cold resistance of lamp
Then use PWM or control signal on DRL to regulate % On. With reverse bat protection, rated for 2x voltage for load dump protection with MOV and current limit or use ICL current limiter for rated current. ..cheap.

 

[NikolaSmart]

can you put some diagram for this type of circuit?

 

[Tony Stewart]

can you put some diagram for this type of circuit?

No time, search google images for CD4060 and mosfet

 

[Flyback]

question is , how is the drl going to know when the ignition is off?.....there is no signal wire to the drl telling drl if ignition is on or off.

 

[Tony Stewart]

Fusebox has supply for steady & ignition switched power to lights, choose the appropriate fused line.