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→Pins not to use for GPIO
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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.
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+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).
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+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).
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+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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