Raspberry Pi 1A and B Revision 2

System on Chip	Broadcom 2835
Number GPIO	20
Status	Fully supported

Supported Features

Read / Write
Interrupt

GPIO Mapping

5v	5v	0v	15	16	1	0v	4	5	0v	6	10	11
3.3v	8	9	7	0v	0	2	3	3.3v	12	13	14	0v

5v	5v	20	0v
3.3v	17	19	0v