Pin mapping
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http://raspi.tv/wp-content/uploads/2014/07/Raspberry-Pi-GPIO-pinouts.png
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http://www.raspberrypi.org/wp-content/uploads/2014/04/bplus-gpio.png
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Pi A/BPi B+
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Rev 2 P1 GPIO headerJ8 B+ GPIO header
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3.3v5v3.3v13v35v25v
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GPIO 25vGPIO 23SDA5v45v
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GPIO 3GNDGPIO 35SCLGND6GND
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GPIO 4GPIO 14GPIO 47P7GPIO 148TXD
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GNDGPIO 15GND9GNDGPIO 1510RXD
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GPIO 17GPIO 18GPIO 1711P0GPIO 1812P1
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GPIO 27GNDGPIO 2713P2GND14GND
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GPIO 22GPIO 23GPIO 2215P3GPIO 2316P4
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3.3vGPIO 243.3v173v3GPIO 2418P5
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GPIO 10GNDGPIO 1019MOSIGND20GND
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GPIO 9GPIO 25GPIO 921MISOGPIO 2522P6
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GPIO 11GPIO 8GPIO 1123SCLKGPIO 824CE0
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GNDGPIO 7GND25GNDGPIO 726CE1
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DNC27DNC28
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GPIO 529GND20
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GPIO 631GPIO 1232
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GPIO 1333GND34
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GPIO 1935GPIO 1636
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GPIO 2637GPIO 2038
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GND39GPIO 2140
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Power +UART
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GNDSPI
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S2CGPIO
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