And you told me.

No user will ever be able to make a device by following your post.

I am telling you now that when a company makes a device, they make it with small parts. We, the common people, will never be able to make a circuit like them for which we will need a machine. Those who are interested in learning can try it in reality by looking at the diagram and can make them but the circuits will be very large and messy and a circuit will be completed in a very large space. And when the circuit made by yourself is complete, it will have to be kept in a separate box and used. And when a company makes a circuit, that company makes a beauty cover according to that circuit which we cannot. I will make a project and show you a PIR motion sensor BC 547 transistor a 3.7 volt battery and a 5 volt relay and an LED light. With these things, I will make a real project and show you. Along with this, I will give a circuit diagram. Then you will see that the project I made by hand has become very large. And when a company makes this thing, it will be all inside a body cover and it will be very beautiful.