Step 2Drill the holes in the PCB
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In this step, I'll show you where to drill the holes in your PCB. Start by placing your Arduino board on top of your prototyping board. When you buy a new Arduino board, it comes with two mounting holes. mark those holes on your prototyping PCB using a pen or permanent marker. then drill the holes. I used M3 screws (M3 means that they're 3mm in diameter), so I used a 3mm drill.
If you choose to mount the battery holder underneath the shield, you should drill 4 holes in each corner of your PCB for the spacers.