Step 1: Ingredients
1)a cent of usa (that is 1/100 of dollar)=6-7(depends on the voltage you want to make)
2)a sand paper of 100 grit.
3)a thin piece of cardboard
5)a cup of water and some salt(if you have vinegar then ignore)
6)a led for testing
Step 2: Which coin to be chosen?
Step 3: Lets make the anode and cathode
Step 4: Lets prepare the electrolyte!
if you have vinegar then ignore the next step