Raspberry Pi Forums

Hcgrant

Just my ten peneth ... I would start by looking at all the interface requirements to the devices you want to monitor/control and see if you can match them with Pi's capabilities. Pi zeros are not expensive .. have one per device ? You could then connect them to your "main" computer either ...

Hcgrant

Thanks Dai-x, Paul and bls for your replies, :) :) Ive really just been a user of networking so far but I think Ive got to get to understand it more to solve this. Ive connected to all the pi's via ssh and run the monitoring programs via idle3 which display on my main computer. I was hoping that any...

Hcgrant

Many thanks for the reply Paul .. I was looking round in /proc to see if I could find a reference to the WAP being connected to ( and didnt find anything ) .. could you give me a clue to how you approached it?

Hcgrant

I have a number of pi's measuring temp and humidity round my house connected by wifi to a central pi which collects the data and then controls the boiler. I also have several Wifi access points and also a not very reliable mains supply which at infrequent intervals dies for very short periods . This...

Hcgrant

I have a headless pi in my shed reading temp and humidity. Every now and then the python program fails. Is there a way I can capture the Traceback and log it to a file? I think I might have found the answer in "Introducing Python". There is a module called 'logging' and from a very brief l...

Hcgrant

Ive got the same problem after I upgraded my 2019-09-26 Buster but on a Pi3

Hcgrant

Thanks Andyroo, I'll have a look at watchdog timers .. internal and the 555 one.
I didnt know that an internal watchdog existed.
Ta,
H C Grant

Hcgrant

I have a number of headless pis scattered round my house measuring temperature and humidity. (the cycle is every ten minutes) Unfortunately we suffer from occasional short power failures .. so short that they don't affect the time on my cooker clock. When this happens a number of the pis fail to res...

Hcgrant

I also thought Buster was not letting me set a static ip .. but thanks to this I looked at the router and found that the ip was already in use!
So thanks

Hcgrant

Done it!
Many thanks Neil ...you know, I missed the Menu/Preferences/Screen Configuration option! How I did I dont know.

Its now working at the resolution I get with a Pi3.

Hcgrant

I have the same problem to you Neil I think ..
See my post
https://www.raspberrypi.org/forums/view ... 8&t=246139
Hope this might help

Hcgrant

Just bought a pi4.. and cant get it to drive my monitor an HPL1906 .. I see a message ..."Signal out of range Change settings to 1280x1024 @ 60hz" Ive set up the SD card in a Pi3 connected identically to the Pi4 , the Pi3 works perfectly, but the Pi4 gives me the error message above. The S...

Hcgrant

Just to add to the above ... Using the pigpiod daemon you can control a pi's GPIOs from any computer (mine is a PC running OpenSuse) that can use the pigpio python lib. And further .. the pi can be using its GPIO via the pigpiod daemon and at the same you can remotely control and monitor (read) its ...

Hcgrant

Does this work with python 3.5.3 ?
When i run ..
python3 mypi_server.pyc
... I get ....
RuntimeError: Bad magic number in .pyc file

When i get it working its going to be just what I need

Hcgrant

ccosse wrote: ↑
Thu Jun 01, 2017 1:27 am
At the top of /etc/rc.local you need to change

#!/bin/sh -x
to
#!/bin/bash

And it will work!

I had the same problem, I use rc.local to run a python script ... making that change to rc.local fixed things for me
Many thanks

Hcgrant

Thanks again for all your inputs .. I think my best soloution is to follow jojopi's advice. I modified the hosts file -- 192.168.254.129 NeTestPi ( removing the 127.0.1.1 address, which, btw, I was confusing with the lo add ) and gethostbyname not unsuprisingly returned 192.168.254.129. :roll:

Hcgrant

This is Interesting .. Ive connected a monitor and keyboard directly to the pi and run your program DougieLawson and it returns the static IP address I assigned via interfaces! But gethostbyname still returns 127.0.1.1 ! Grrrrrrr

Hcgrant

Re DougieLawson .. yes I did configure the static address in /etc/network/interfaces. I'll look at /etc/dhcpcd.conf .. thanks Re jojopi .. Thanks .. I'm going to have to learn a bit more about making connections. I still dont know why get gethostbyname returned the lo IP add .. Ive used this constr...

Hcgrant

Thanks everyone for their answers . Re DougieLawson .. I ran your program on the pi but it didn't return the IP I was expecting.. The pi has a fixed IP add but the one returned looks like it was obtained by DHCP . Perhaps a bit more explanation of my aims might help .. there may be a better way of t...

Hcgrant

I'm accessing my raspberry pi with "ssh 192.168.254.129 -X -l pi" I'm running idle3 on the pi ( pi@NeTestPi:~ $:idle3 & ) but the idle3 windows are X forwarded to my local comp (suse linux) In the idle3 shell the command >>>socket.gethostbyname("NeTestPi") yeilds '127.0.1.1' ...

Hcgrant

I had the problem too, see viewtopic.php?f=28&t=141454, particularly the solution suggested by SR-71. His /Her ? solution worked for me. So many thanks SR-71

Hcgrant

On the new B+ , close to the Led's are two through holes. The holes are contained within a white rectangle labelled "RUN"
What is the purpose of this ?
Does anyone know ?

Hcgrant

Hi DBryiant ..thanks for the reply Ive checked for the vnc server running after boot with "ps axu" ...its not running. I wondered if it wont run as root and tried "sudo vncserver" .. that started the vnc server and I can login. So thats not the problem ... :-( I'll try the method...

Hcgrant

Hi sheardo123 what do you mean by connect? Do the led's flash when you plugin the power cable? What do you mean by " I prepped the SD card connected the pi to mains using a HTC phone charger " ? The HDC phone charger , does this produce +5v with at least 700ma ? Have you put an operating s...

Hcgrant

Hi , Im hoping someone can explain this to me ... I want to run vncserver at boot so ive added the following to /etc/rc.local .. ---------------------------------------------------- # # my bit to start the VNC server # /usr/bin/vncserver date >> /home/pi/vnclocalran # to monitor that rc.local ran an...

Search found 25 matches

Re: Large but flexible project?

Re: Pi wifi re/connection

Re: Pi wifi re/connection

Pi wifi re/connection

Logging Python Traceback

Re: Pi Zero W v1.1 - "No wireless interface found" on 2019-09-26 Buster Lite

Re: Pi not rebooting after power failure

Pi not rebooting after power failure

Re: Setting static IP address on a Pi 4

Re: Cant get hdmi to work from pi4

Re: [Solved] New Raspberry 4b 4g dead upon arrival

[solved] Cant get hdmi to work from pi4

Re: what is remote GPIO

Re: MyPi - New iOS App for Home Automation projects

Re: rc.local after upgrade to jessie does not work

Re: socket.gethostbyname returns wrong interface ip add

Re: socket.gethostbyname returns wrong interface ip add

Re: socket.gethostbyname returns wrong interface ip add

Re: socket.gethostbyname returns wrong interface ip add

socket.gethostbyname returns wrong interface ip add

Re: Time is not updating

B+ "Run"

Re: Can't get rc.local to run vncserver at boot

Re: Can't get pi to work!

Can't get rc.local to run vncserver at boot