WHAT IS IT?
  This is a very simple datapack which makes it so copper would be used instead of other materials in most redstone related items.

  WHY?
  Copper is a plentiful yet useless metal. I found it would be appropriate to make it an integral necessity for redstone.

  WHICH ITEMS?
  This datapack changes the recipes of: Compass, Redstone Torch, Comparator, Piston, Observer, Repeater, Dispenser, Dropper, Hopper, Rail, Detector Rail, Activator Rail.

  WHAT IS NEW IN VERSION TWO?
  The main principle has changed. In the first version, I aimed to change recipes which previously required iron to use copper if appropriate. This time I sticked to redstone related items without any regards to whether the recipe originally included iron or not. As a result of this, this version does not include the copper armor, but changes a lot more stuff in return.
  Also this time I put more effort on textures to make them as pretty as I can. As an unplanned outcome of sticking to redstone related items with this version, I believe I have created a nice theme for redstone contraptions as a side effect (since most devices are copper now).

  HOW DO I INSTALL?
  1. Download the datapack and the resourcepack.
  2. Put the resourcepack into the resourcepack folder in .minecraft.
  3. If you're creating a new world, click on the "Data Packs" button in the world creation menu; click on "Open Pack Folder" in the screen that follows and put the datapack you downloaded into that folder.
  4. If you want to install on an existing world, go into the "saves" folder in .minecraft and open the save you want to install. Put the datapack you downloaded into the "datapacks" folder.

  The resource pack is not required for the data pack to work. But it is highly recommended.

  Thanks to all the people in /mcg/ for their input.