RPi GPIO Pin number

RPi GPIO Pin number  =  Extension Board Pin number

1 = 3.3V
2 = 5V
3 = SDA
4 = 5V
5 = SCL
6 = GND
7 = P7
8 = TXD
9 = GND
10 = RXD
11 = P0
12 = P1
13 = P2
14 = GND
15 = P3
16 = P4
17 = 3.3V
18 = P5
19 = MOSI
20 = GND
21 = MISO
22 = P6
23 = SCLK
24 = CE0
25 = GND
26 = CE1