Hello
*.ino in Arduino is working well
The flow for noder-red is ok
BUT
There is a communication error with /dev/ttyAMA0 Permission denied.
Is there someone with a solution for that permission denied.
Dick
on the command line type in the following:
$ ls /dev/ttyACM0 -l
On my system I get
crw-rw----+ 1 root dialout 166, 0 May 17 21:51 /dev/ttyACM0
Add the current user to the dialout group:
sudo adduser current_user dialout
so on a Raspberry Pi (If you chave not changed the default user)
sudo adduser pi dialout
You can find out the current user with
whoami
Thanks
I tried this help
ls /dev/ttyAMA0 -l
crw -rw-rw- 1 root dialout 204 64 mei 18 15:30 /dev/ttyAMA0
pi is already member of dialout
Whoami Ă pi
And the result is negative
Dick
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Can you post the output of:
ls /dev/ttyA*
Ghayne
The output is
/dev/ttyAMA0
Hope you can help me with this problem
Dick
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If pi is already a member of the group dialout I have no idea why access to the serial port is denied. Which version of Node-red are you using?
This is the Bluetooth port on the Pi!! I think you might be using the wrong serial port if you have a wired connection!
Have a look at this how to setup the port correct:
1 Like
Ghany thanks again.
Indeed i have a wired connection
ls /dev/tty* gives the possibility to use dev/ttyS0
I tried /dev/ttyS0 and the error “permission denied “has disapeared .
But now is there a new error:
"serial port /dev/ttyS0 error: Error: Error: No such file or directory, cannot open /dev/ttyS0
Now i am looking for that solution.
Dick
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Edje thanks
In deed i use the wrong port
I wiil try to read and understand your message
Dick
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