This shows my layout for the relay PCB. I generally find that when I design things like this, I always either forget something or want to change something later. For this reason, I always add a few spare PCB pads to accommodate any alterations or additions. I used some of these to fit in a 7805 regulator. I don’t like to rely on the Adrduino’s regulator to power things if I can avoid it. This also led to the need for some wired links on the PCB. I always wire these under the PCB so they don’t show!
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