Raspberry Pi 1A+ and B+

System on Chip	Broadcom 2835
Number GPIO	30
Status	Fully supported

Supported Features

Read / Write
Interrupt

GPIO Mapping

5v	5v	0v	15	16	1	0v	4	5	0v	6	10	11	31	0v	26	0v	27	28	29
3.3v	8	9	7	0v	0	2	3	3.3v	12	13	14	0v	30	21	22	23	24	25	0v