What is your way of getting scrap?

I am an new player, and now I am building a scrap farm on (batery sensors)

While I am making it, I am interested in other people suggestions or strategies.

I found that from 2 scrap you can get 2 graphite and 2 materials which go to Zinc, so I get materials enough to make 2 batery sensors and they make about 3 scrap...