Connector pinout: Raspberry Pi GPIO (r1 B+ A+)(r2 B)(R3 B B+ A+)(r4 B)A 40-pin GPIO header is found on all current Raspberry Pi boards manuafactured after 2014. Prior to the Pi 1 Model B+ (2014), boards comprised a shorter 26-pin header. raspbery pi rev. 2+ 40 pin GPIO  raspbery pi rev. 2+ 40 pin GPIO  raspbery pi rev. 2+ 40 pin GPIO  raspbery pi rev. 2+ 40 pin GPIO 
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