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→Pins not to use for GPIO
And Pin 13 ( GPIO27) is used for a fan so if this is something you believe you need it is a good idea to leave this pin free.
And Pin 13 ( GPIO27) is used for a fan so if this is something you believe you need it is a good idea to leave this pin free.
Be aware that the I2C pins (pins 3,5) are used for all kinds of expansions and also the correct way to do this sort of encoder addition ( 23017 uses this, and a couple of other pins).
If you have audio card then several other pins have will be used, and that is the sort of information to get from the data sheet for the card.
For instance some cards use the I2C pins for parameter controls and then GPIO 18,19,20,21 ( Actual Pi Pins 12,35,38,40).
Depending on what you are trying to do other pins can be used, but it's wise to have an idea of what else was is used on your machine.
If you want to try out the simplest config use an USB Audio connection and you shouldn't have to worry.
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