There is a really nice electronics reference ruler It is the ideal quick reference for RPi.GPIO hacking on the Raspberry Pi in Python. Also has all the most commonly used RPi.GPIO code, which can be hard to remember. A Raspberry Pi port identification aid (GPIO numbers and Alt functions) that can be used as a ruler (cm/inches) too. It’s fits easily in a pencil case, toolbox or desk tidy.
Size: 110mm x 30mm
GPIO Ruler for Raspberry Pi x 1
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