GPIO not available on Raspberry

Hello Guys!

I just started to use Raspberry OS Full with applications. First when I installed it, noticed, that it has built in Node-RED (so cool). I tried it without any modification and I manage to control GPIO pin 2 without any issue through Node-RED. Then I did an upgrade according to this article:

Also I setup Node-RED to start as a service. I added a few nodes to it, like the node-red-contrib-s7 and node-red-dashboard. I setup PIGPIOD to start automatically after reboot with this command:

sudo systemctl enable pigpiod

Additionally I setup to run my .py program, which controls the MeArm Robot with Crontab with the help of this article (you can find the autostart description in the middle):

I wanted to do the same, as before, control the same GPIO 2 with node-red-node-pi-gpio, but now it says not available.

  1. I am using Rasberry Pi 4 with 8 gb RAM.
  2. The newest Rasberry OS is installed on it.
  3. GPIO-s are working, if I run a python program on it.
  4. Doesn't matter if I set it up as output or input, it won't work. Always show not available.
  5. node-red startup log

"pi@zeus:~ $ node-red startup log
10 Nov 19:14:50 - [info]

Welcome to Node-RED

10 Nov 19:14:50 - [info] Node-RED version: v2.1.3
10 Nov 19:14:50 - [info] Node.js version: v12.22.5
10 Nov 19:14:50 - [info] Linux 5.10.63-v7l+ arm LE
10 Nov 19:14:51 - [info] Loading palette nodes
10 Nov 19:14:53 - [info] Dashboard version 3.1.1 started at /ui
10 Nov 19:14:53 - [warn] rpi-gpio : Raspberry Pi specific node set inactive
10 Nov 19:14:53 - [info] Settings file : /home/pi/.node-red/settings.js
10 Nov 19:14:53 - [info] Context store : 'default' [module=memory]
10 Nov 19:14:53 - [info] User directory : /home/pi/.node-red
10 Nov 19:14:53 - [warn] Projects disabled : editorTheme.projects.enabled=false
10 Nov 19:14:53 - [info] Flows file : /home/pi/.node-red/startup
10 Nov 19:14:53 - [info] Creating new flow file
10 Nov 19:14:53 - [warn]

Your flow credentials file is encrypted using a system-generated key.

If the system-generated key is lost for any reason, your credentials
file will not be recoverable, you will have to delete it and re-enter
your credentials.

You should set your own key using the 'credentialSecret' option in
your settings file. Node-RED will then re-encrypt your credentials
file using your chosen key the next time you deploy a change."

  1. Export of the flow with all the nodes, what I have now online. Only using the S7 and GPIO nodes.
  2. I'm not using any extra hardware.
  3. Start and Stop the Node-RED did not help.
  4. I even disabled the script Autostart function, but it did not help either.

This is the last step what I want to achieve on Raspberry to my Master Thesis, besides that the missing part is setting up the Node-RED communicating with the Siemens S7 300 PLC and Raspberry correctly and make a nice dashboard for it.

If you have any idea how to get GPIO alive again, please let me know. I don't want to start from the beginning again. The strange thing, that the first time with brand new Raspberry OS without any Node-RED upgrade it worked :confused:

maybe this service that you are starting uses the PINS and doesnt allow the Node-red RPi Node to access them ? what if you stop that service and restart NR server ?

You don't need pigpiod for node-red-node-pi-gpio. That is for node-red-node-pi-gpiod.
See Interacting with Raspberry Pi GPIO : Node-RED
I don't know what the effect of running pigpiod is when trying to use the pi-gpio node.

This is not about creating custom nodes - moved to general


I need to have run this service to be able to control the robot from my python program.
Anyway, I just tried to stop the pigpiod to check if that is the case, then restarted Node-RED several times, but the results was the same: not available.

Hi Colin!

When I tried this on the brand new Rasberry OS, it worked. I could start the robot sequence from a button connected to the GPIO and also from Node-RED. At that time PIGPIOD was running behind. So I think that is not the problem. Something else should be.

Any other idea?

Which version is that?

[Edit] Also what do these commands show
apt-cache policy rpi.gpio

pi@zeus:~ $ cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 11 (bullseye)"
NAME="Raspbian GNU/Linux"
VERSION="11 (bullseye)"
SUPPORT_URL="RaspbianForums - Raspbian"
BUG_REPORT_URL="RaspbianBugs - Raspbian"

pi@zeus:~ $ apt-cache policy rpi.gpio
Installed: 0.7.0-0.2+b1
Candidate: 0.7.0-0.2+b1
Version table:
*** 0.7.0-0.2+b1 500
500 Index of /raspbian bullseye/main armhf Packages
100 /var/lib/dpkg/status
Installed: (none)
Candidate: (none)
Version table:
Installed: 0.7.0-0.2+b1
Candidate: 0.7.0-0.2+b1
Version table:
*** 0.7.0-0.2+b1 500
500 Index of /raspbian bullseye/main armhf Packages
100 /var/lib/dpkg/status
pi@zeus:~ $ groups
pi adm dialout cdrom sudo audio video plugdev games users input netdev lpadmin gpio i2c spi
pi@zeus:~ $

That all looks ok.
This thread has another user unable to access the GPIO with raspbian bullseye (which has only just been released)

1 Like

I don't think it will help, but for the record, what does uname -a show?

pi@zeus:~ $ uname -a
Linux zeus 5.10.63-v7l+ #1459 SMP Wed Oct 6 16:41:57 BST 2021 armv7l GNU/Linux

I think we need to wait for @cymplecy to complete his install (in the other thread) to see if he also sees the issue.

For anyone finding this it looks like we have a fix in the the other thread.

1 Like