Use of GPIO pins

[edsulst]

Hi There,

For my project I'm using 17 GPIO pins, but I need one extra.

The GPIO pins I'm using are alle the green one's as mentioned here: https://www.raspberrypi-spy.co.uk/2012/ ... tyPhoto/1/

Is it possible to use another GPIO pin, for example 2, 3, 9 or 10, as an input as well ?

Gr. Edwin

[B.Goode]

Hi There,

For my project I'm using 17 GPIO pins, but I need one extra.

The GPIO pins I'm using are alle the green one's as mentioned here: https://www.raspberrypi-spy.co.uk/2012/ ... tyPhoto/1/

Is it possible to use another GPIO pin, for example 2, 3, 9 or 10, as an input as well ?

Gr. Edwin

The 40-way header on all recent RPi boards has 26 programmable gpio pins. See https://pinout.xyz/

Do you have very early hardware with only a 26-pin header?

[hippy]

The GPIO pins I'm using are alle the green one's as mentioned here: https://www.raspberrypi-spy.co.uk/2012/ ... tyPhoto/1/

The blue, purple and pink marked GPIO pins are used for specific special purposes but can also be used as general purpose input or output if not otherwise used.

[DougieLawson]

The 40-way header on all recent [sic] RPi boards has 26 programmable gpio pins. See https://pinout.xyz/

Do you have very early hardware with only a 26-pin header?

"Recent" being since the release of the original B+ in July 2014.

[edsulst]

Sorry, but I forgot to tell you that I have a Raspberry Pi 3 model B V1.2 with a 40 pin header.
Now I only used the green colored pins and I wasn't sure if other colors could be used.

But if I read the posts correctly it's possible to use the blue, purple and pink also. GREAT !!

I did read somewhere that the yellow color pins can't be used
Since you never mentioned the yellow color I think that's right.

[DougieLawson]

Now I only used the green colored pins and I wasn't sure if other colors could be used.

What? The pins on a regular RPi are not coloured in any way.



https://pinout.xyz shows you which pins are which.

[rpdom]

https://pinout.xyz shows you which pins are which.

It does indeed, and oh, look... the pins are coloured in that image!

[DougieLawson]

Those colours aren't on a physical RPi3B.

There are coloured headers you can solder in to a Zero https://shop.pimoroni.com/products/colo ... io-headers but they don't match https://pinout.xyz

The 3.3V, 5V, and GND pins are not GPIOs.There are 28 usable GPIOs.

[Burngate]

The GPIO pins I'm using are alle the green one's as mentioned here: https://www.raspberrypi-spy.co.uk/2012/ ... tyPhoto/1/

Those colours aren't on a physical RPi3B.

Do we really need to argue about where the colour is? It seems obvious to me that edsulst is referring to the colouring used by raspberry-spy.

I did read somewhere that the yellow color pins can't be used
Since you never mentioned the yellow color I think that's right.

If you're referring to pins 27 & 28, it's best not to use those GPIOs since at boot-up, the Pi checks them for HATs, and can get its knickers twisted if something's connected to them.

[DougieLawson]

The GPIO pins I'm using are alle the green one's as mentioned here: https://www.raspberrypi-spy.co.uk/2012/ ... tyPhoto/1/

Those colours aren't on a physical RPi3B.

Do we really need to argue about where the colour is? It seems obvious to me that edsulst is referring to the colouring used by raspberry-spy.

I didn't click that Raspberrypi-Spy URL as it includes a date of "2012/06" so I'd assumed it was for the 26 pin Raspberries.
My URL of choice for the pins is https://pinout.xyz as it has added value that each pin can be clicked for a description and there's stuff for I2C, SPI, etc. and a whole raft of HATs and pHATs on there.

[edsulst]

Thank you all for answering to my question.
It's clear to me now that I can use more pins than I thought.


// Edwin