Raspberry Pi Forums

Tyrael_Archangel

you may also need to add

#!/usr/bin/python

to the very top of your script (first line), I can't remember if this is required or not for it to work but it can't hurt

Tyrael_Archangel

you can use something like this to restart a python script from within itself

Code: Select all

os.execv('/AbsolutePathtoScript/a.py', lst_args)

I use this within a script that handles upgrading the rest of my code to restart itself if it needs to upgrade itself.

Tyrael_Archangel

The level shifting is likely your problem then. While the magpi article does not use level shifting, Adafruit recommends it as 3.3v logic may not always be enough. to quote Adafruit: Note that you might be able to get your NeoPixels to work without any level conversion, but it's not really guarantee...

Tyrael_Archangel

I can think of 2 things to check: 1. Are you level shifting the Pi's signaling output to 5V? the Neopixels require 5V signalling so if you are not level shifting up the voltage there is a good chance your not hitting strong enough signal for the ws281x drivers to detect or only sometimes detect. 2. ...

Tyrael_Archangel

Sorry to hear that your having problems with them. I have had nothing but good experiences with them and have order around a dozen or so Pi from them over the past 2 years (both through amazon and their website) for both personal and business use. That said I have never needed to contact them so I c...

Tyrael_Archangel

Hi All, a while back I created an application on a Pi that performs some optical measurement tests on various devices that we manufacture. I have been asked to extend the range of measurements that it performs. As part of these new measurements I will need to be able to use the HDMI port on the Pi t...

Tyrael_Archangel

On one of my Pi's I'm running Jessie 2017-01-11. Setting a fxed ip is extensively documented and I can confirm it works. However, I'm struggling to also set fixed values for the domain name and the search list. I got the domain name inserted by adding it to /etc/resolvconf.conf: domain = mydomain.l...

Tyrael_Archangel

axl.axel wrote:
I run the python code with the following line added to rc.local:
> sudo python logging.py &

you need to drop the sudo (rc.local will be run from root) and add the full path to your python script

something like:

python /home/pi/logging.py &

Tyrael_Archangel

Ok, working Code this time (Had to change calls from PyQt4 to PySide since thats what I have) gui.py (the auto generated stuff) # -*- coding: utf-8 -*- # Form implementation generated from reading ui file 'GUI_test.ui' # # Created: Mon Jan 16 16:47:13 2017 # by: PyQt4 UI code generator 4.11.2 # # WA...

Tyrael_Archangel

Generally with PySide or PyQt, you should leave the auto generated code alone and then from another module import the generated class and subclass it. In that subclass is where you would connect signals and slots and add custom methods something like this: (Note: I dont have PyQt installed so this c...

Tyrael_Archangel

Can you post how to do this? sure its pretty easy. 1. open /etc/apt/sources.list 2. change the line: deb http://mirrordirector.raspbian.org/raspbian/ jessie main contrib non-free rpi to deb http://mirrordirector.raspbian.org/raspbian/ stretch main contrib non-free rpi 3. do an apt-get update 4. apt...

Tyrael_Archangel

Thanks guys, I'll check those pages. In the mean time I found this wiki page. Not the most up-to-date, but at least at a place where I guess we can depend on this actually having some value. Did anyone try this tutorial? https://wiki.qt.io/RaspberryPi2EGLFS I tried an older version of this tutorial...

Tyrael_Archangel

Did you solve it? If so, can you please post how? I'm trying to find out which camera hardware is connected through python and querying the camera's resolution. if I connect camera v2.1 and in python print(camera.MAX_RESOLUTION) python responds with the wrong values of camera v1.x (2592, 1944) Pica...

Tyrael_Archangel

I use one of these to power multiple pi's at once: http://www.amazon.com/Anker-6-Port-Charger-PowerPort-Samsung/dp/B00P936188/ref=sr_1_6?s=lawn-garden&ie=UTF8&qid=1462221712&sr=8-6&keywords=anker+powerport Although its technically for charging multiple phones, it works well and can supply up to 2.4 ...

Tyrael_Archangel

So have I have done some experimenting with your suggestions and I cant get this to work the way I would like. If I put the static lines right after the arping lines, that address is always assigned even if the arping is found. if I put the static lines after the arping profiles, dhcpcd crashes (I a...

Tyrael_Archangel

Does anyone know if it is possible to control the Act LED on a Pi 3 through the GPIO? I know that this was possible on the Pi 2, but with the LED moved to the GPIO expander can this still be done and how?

Tyrael_Archangel

Thanks for the advice on this rurwin, when I get a chance I'll play around with this and let you know how it goes. Would you happen to know if there is a command I could run after modifying the conf file to force dhcpcd to reload and re-configure the interface based on the new conf file?

Tyrael_Archangel

Is there a way to dhcpcd.conf so that it tries all the arping profiles and if none are found it just sets a specified static address instead of attempting to get a DHCP address? (kinda like the fallback profile, but not needing DHCP to fail before it sets it)

Tyrael_Archangel

after a bit of a struggle getting my code to work as I wanted it to, it appears that the [pi3] filter seems to work and I am able to switch the same image between a Pi 2 and a Pi 3 without issue with the overlay being correctly applied to the Pi 3 and not the Pi 2

Tyrael_Archangel

Does anyone know if the boot config.txt supports a [pi3] filter like it does for the [pi1] and [pi2]?
I am looking at adding support for the Pi 3 to my code, but I will need to apply a dt overlay only if the Pi is a Pi 3.

Thanks

Tyrael_Archangel

Without any code I can only make guesses, but I would think that scripts A and B have some sort of interdependence on each other, either directly (direct communication between the 2) or indirectly (like sharing a file or common resource) and that interdependence is the source of your crash. We launc...

Tyrael_Archangel

I have 2 questions about the pi 3 currently.

1. does the boot/config.txt support a [pi3] for pi 3 specific configs like it does for the original pi and pi 2?

2. is there a way to control the pi 3 ACT LED from a GPIO like we could with the pi 2?

Tyrael_Archangel

... So it doesn't share the usb bus with the 4 ports and Ethernet? Also i am guessing the uart pins on the gpio header are untouched and can be used normally. WiFi / BT are both connected via bank 1 GPIOs. The UART on the GPIO header is now the mini-uart - a slight downside is that variations in co...

Search found 23 matches

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