The arduino might be a development board but the way i see it, the IO-pins does not have to be be a 1:1 mapping to the IC-pins. I want it to be a safe and relia

The arduino might be a development board but the way i see it, the IO-pins does not have to be be a 1:1 mapping to the IC-pins. I want it to be a safe and reliable, general purpose IO-unit. For that, applying these fixes saves you from many accidental mis-connections.