...only use obsidian pressure plates, they are "mob safe."
Just to clarify this last bit as OP seems quite new: With normal wood and stone pressure plates, if a mob steps on them it will open the door. Creepers can track you from outside your house, and zombies love to charge doors anyways...so, these pressure plates are very bad for outside your door.
Since you have DW20 pack, you have EE3. Once you get a minium stone, you can use it to convert 2 wood to obsidian. This makes obsidian extra easy to get, so I would def. say to go with obsidian plates.