Robert Brown Focuser Controller build, step by step #9

I’ve just realised that I forgot to put in the current-limiting resistor for the buzzer (that’s what I assume it’s there for, anyhow). Probably because it doesn’t appear on the stripboard layouts which aren’t always kept up to date with the most recent changes to the design. I assume it was added later. Fortunately there’s room to move the pin header for connecting the buzzer further away from the Nano and I can just drop a resistor in across a break in the track.