I'm kind of new to raspberry pi, and I saw a tutorial about making a LED blink. The LED was connected to pin 17, but the tutorial said pin 11. I connected the LED to pin 17, and in the terminal I wrote pin 11 to HIGH, and it came on. Are the gpio pins addressed differently for software/hardware? Where can I get a chart of these correlations? Very confused. Please help
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1 Answer
There are several different GPIO numbering schemes.
You need to ensure that the software you are using is using the numbering scheme you expect.
See https://pinout.xyz/ for the gory details.
The most popular numbering schemes are
- the (physical) expansion header pin number
- the (Broadcom) GPIO number
I use this chart.
GPIO pin pin GPIO
3V3 1 2 5V
0/2 (SDA) 3 4 5V
1/3 (SCL) 5 6 0V
4 7 8 14 (TXD)
0V 9 10 15 (RXD)
17 (ce1) 11 12 18 (ce0)
21/27 13 14 0V
22 15 16 23
3V3 17 18 24
10 (MOSI) 19 20 0V
9 (MISO) 21 22 25
11 (SCLK) 23 24 8 (CE0)
0V 25 26 7 (CE1)
.......
0 (ID_SD) 27 28 1 (ID_SC)
5 29 30 0V
6 31 32 12
13 33 34 0V
19 (miso) 35 36 16 (ce2)
26 37 38 20 (mosi)
0V 39 40 21 (sclk)
If the GPIO column has a V it indicates the pin is connected to the power rail and not a GPIO.
Where 2 figures are shown separated by a / the first figure is the GPIO number used on the first revision Pi B boards.
