Arduino fire extinguisher car advices

On your new diagram the board still powered with 5v to VIN and 5v relay via 3v3 arduino output?

I will draw it all over, just added those wires from l298n to arduino digital pins

But how am I supposed to get more supply there? extra power supply?

I watched this guy, that's where scheme came from, he connected everything as same as me

  • Write the required voltage beside the devices (in the drawing) needing power.
  • Provide enough voltage to supply the highest voltage device, plus 10% (up to +50%).
  • If a device requires a lower voltage than the power supply, use a "buck" (step-down) converter to meet that need.

The video doesn't contains neither diagram nor code

I think the author lied to you about his project working. All he wanted was clicks.

@b707 - Code is in the comments section... along with this comment:

@harish012. Your code totally wrong bro please send correct code please

Could this work? Still don't know how to get more power in VIN


or this, can marge 2 power supplies and get 13.2v power if 7.2 isn't enough