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by SteveSpencer
Tue Feb 19, 2019 4:47 pm
Forum: General discussion
Topic: raspi 3b+ jukebox for everyone
Replies: 5
Views: 459

Re: raspi 3b+ jukebox for everyone

Familiar, yes, but a right pain, since you have to scan columns and rows. I'd be inclined to use an arduino (or generic ATMega-whatever) to do the scanning, and have it send data out to the Pi on the serial port. Obviously, that's further complicated by using a level convertor if you run the arduino...
by SteveSpencer
Wed Feb 13, 2019 9:52 am
Forum: General discussion
Topic: Usage of Pi touch display and power button
Replies: 3
Views: 239

Re: Usage of Pi touch display and power button

I just read the first article the OP referred to. It uses GPIO3 specifically because grounding that will wake the Pi from a "halted" state. However, I would suggest using TWO buttons, a GREEN button between GPIO3 and Gnd, and then pick an otherwise unused exposed GPIO for the shutdown function, on a...
by SteveSpencer
Fri Feb 01, 2019 3:52 pm
Forum: Beginners
Topic: Different GPIO Pins?
Replies: 16
Views: 1074

Re: Different GPIO Pins?

1-Wire, that is one of the most complex and strange variations on I2C, and very hard to get working, not for beginners who want to keep their sanity. :mrgreen: Its easy, some GPIO pins can, but don't have to, be used with special hardware in the chip, to be used for specific hardware functions. exa...
by SteveSpencer
Tue Jan 29, 2019 9:32 am
Forum: Troubleshooting
Topic: Octoprint on college wifi
Replies: 1
Views: 161

Re: Octoprint on college wifi

Which MAC address have you registered, the Wifi one or the LAN one?
by SteveSpencer
Fri Jan 25, 2019 9:14 am
Forum: Beginners
Topic: can a python file be made to run in a way that is not humanly readable?
Replies: 15
Views: 675

Re: can a python file be made to run in a way that is not humanly readable?

Pigpiod does multiple PWM, doesn't it? And you use it as is, through a server interface, so as I understand it, you aren't obliged to supply the source (IANAL applies) for your client, just as using TCP/IP doesn't oblige you to provide the source for the network layer. Of course, if you're using oth...
by SteveSpencer
Thu Jan 24, 2019 10:16 am
Forum: Beginners
Topic: Relay boards
Replies: 31
Views: 2977

Re: Relay boards

You would expect that to be the case, but many relay boards available work on reversed logic from that point of view. In reality you are pulling something low, and that activates the relay. This allows the use of pull-up resistors so that the overall system comes up with everything switched off, whi...
by SteveSpencer
Mon Jan 21, 2019 4:58 pm
Forum: General discussion
Topic: STICKY: Making your own custom burn-n-boot Raspbian image
Replies: 31
Views: 9408

Re: Making your own custom burn-n-boot Raspbian image

That sounds very useful to me! Is there a way that I can even use apt to install packages that is not in the original image myself? I assume I need to mount the image to an real Raspberry Pi to do that.... if it is even possible. Yes, it is, within disk space limits. Remember that your root fs has ...
by SteveSpencer
Fri Jun 22, 2018 8:55 am
Forum: Troubleshooting
Topic: DHCP issue with dhcpcd and Windows Server 2008R2
Replies: 0
Views: 171

DHCP issue with dhcpcd and Windows Server 2008R2

I'm pretty sure this is not a dhcpcd problem, but thought I would ask in here before banging my head against the wall again. I have a Pi2, which has a hostname of "devbox". I use this at home, and occasionally at work (since it has my media player on it). When at work, the dhcp server in use is the ...
by SteveSpencer
Sat Jun 02, 2018 11:32 am
Forum: Raspbian
Topic: Raspbian Lite questions
Replies: 22
Views: 2164

Re: Raspbian Lite questions

[insert web search engine of choice here] is your friend.

https://github.com/Drewsif/PiShrink
by SteveSpencer
Wed May 30, 2018 9:22 am
Forum: Troubleshooting
Topic: Connecting to a 7inch HDMI LCD
Replies: 9
Views: 3893

Re: Connecting to a 7inch HDMI LCD

Agree with previous post. Many of the small HDMI displays don't properly implement the feature where the device returns a valid EDID block, which is how the display explains what resolutions etc are supported or preferred. Mostly, once that is sorted, the touchscreen is either SPI (so the Pi physica...
by SteveSpencer
Wed May 09, 2018 3:35 pm
Forum: General discussion
Topic: USB car to Raspberry pi
Replies: 4
Views: 492

Re: USB car to Raspberry pi

As a minimum, you should check what the current limit on the car adapter is, and also make sure the adapter contains a fuse. I wouldn't use a 12v car battery myself, although a smaller 12v battery such as the type used by mobility scooters or golf carts would be roughly the same. Somewhere I do have...
by SteveSpencer
Tue May 08, 2018 2:58 pm
Forum: General discussion
Topic: Raspberry 3 7" touch screen Python Code
Replies: 2
Views: 427

Re: Raspberry 3 7" touch screen Python Code

It sounds like you need to use the listbox widget.
That should have a scrollbar you can operate with the touchscreen.
by SteveSpencer
Tue May 08, 2018 11:00 am
Forum: General discussion
Topic: Problems after latest update
Replies: 1
Views: 183

Re: Problems after latest update

Can't help with problem #2. As for problem one, do you (as the current user, presumably "pi") have permission to change the files in question? They may be somewhere under /var/www. Do you have a general issue with writing files? Things to check df -h so you can see how much disk space you have echo ...
by SteveSpencer
Tue May 08, 2018 10:52 am
Forum: General discussion
Topic: pi cant find package when time to install
Replies: 18
Views: 1482

Re: pi cant find package when time to install

Generally speaking, if you are using wget to download a package, then apt-get won't know about the package.
This is because apt-get will get details of packages from (generally public) repositories, via apt-get update.

If you have manually downloaded a package, you should use dpkg to install it.
by SteveSpencer
Fri May 04, 2018 12:11 pm
Forum: Troubleshooting
Topic: Changing the MAC address on a Pi 3B+
Replies: 7
Views: 2252

Re: Changing the MAC address on a Pi 3B+

You can do it via the /boot/cmdline.txt, see viewtopic.php?t=33252#p284683
by SteveSpencer
Mon Apr 30, 2018 1:17 pm
Forum: Raspbian
Topic: Jessie Lite + unofficial Touchscreen
Replies: 1
Views: 265

Re: Jessie Lite + unofficial Touchscreen

Firstly, you should upgrade to stretch, rather than Jessie. That said, the following is, I believe, true for both versions. The "lite" version doesn't include any GUI elements, so the $64,000 question is, what do you expect the touchscreen to actually do? You can see if the touchscreen is actually r...
by SteveSpencer
Sat Apr 28, 2018 5:10 pm
Forum: General discussion
Topic: Internal HDD Format
Replies: 11
Views: 1518

Re: Internal HDD Format

A Pi has no internal HDD.
It may have an SD card, in some shape or other, but not necessarily.
by SteveSpencer
Fri Apr 27, 2018 8:42 am
Forum: C/C++
Topic: Unable to start dbus-daemon on Raspbian Lite
Replies: 5
Views: 1420

Re: Unable to start dbus-daemon on Raspbian Lite

Named pipes, shared memory, sockets are the ones that immediately spring to mind, or MQTT, even.
by SteveSpencer
Thu Apr 26, 2018 8:29 am
Forum: Troubleshooting
Topic: Connect RB3 on WPA2 Enterprise
Replies: 2
Views: 1810

Re: Connect RB3 on WPA2 Enterprise

Have you read viewtopic.php?f=29&t=205360&p=1274159#p1272896 ?
It might help you.
by SteveSpencer
Wed Apr 18, 2018 9:16 am
Forum: Raspbian
Topic: Need help compiling a kernel module for latest Raspbian
Replies: 2
Views: 404

Re: Need help compiling a kernel module for latest Raspbian

Looking at the github you specified, it appears that this is for kernel version 3.8.13, which is far older than the version currently available for the Pi .
You may be out of luck, unless you can find the source for a later version. Is there a discussion group or anything for the opennetworking stuff?
by SteveSpencer
Mon Apr 16, 2018 8:55 am
Forum: Raspbian
Topic: Is raspbian a bad choice for 24/7 iot?
Replies: 13
Views: 1789

Re: Why is raspbian bad choice for 24/7 iot?

A Raspberry Pi is for education, it’s cheap and meant for experimenting - you can try whatever OS you want without breaking your main computer ;) Actually, at home, I have a Pi as my main computer. However, because they are so cheap, I have many others for experimenting with. Despite the fact I hav...
by SteveSpencer
Fri Apr 13, 2018 2:10 pm
Forum: Raspbian
Topic: Custom GUI?
Replies: 2
Views: 372

Re: Custom GUI?

If you want to design it yourself then you probably have to also write it yourself so which programming languages do you know ? That is almost certainly true. I had in mind something similar at one time for the Adafruit TFT screens, which also have 4 GPIOs which can be connected to buttons (think l...
by SteveSpencer
Fri Apr 13, 2018 1:52 pm
Forum: General discussion
Topic: IOError: [Errno 121] Remote I/O error
Replies: 3
Views: 1269

Re: IOError: [Errno 121] Remote I/O error

If you leave the ADDR pin floating, it may switch between on/off, because it is not being tied one way or the other. This means it could change the address while you are using it - never a good idea.
by SteveSpencer
Fri Apr 13, 2018 1:49 pm
Forum: General discussion
Topic: Raspberry Pi3 Bluetooth
Replies: 2
Views: 267

Re: Raspberry Pi3 Bluetooth

Receive and transmit, just like the ZeroW is.

I have a ZeroW playing music to bluetooth speakers, for example, and a 3 that is capturing a different audio stream from a mobile phone.
by SteveSpencer
Fri Apr 13, 2018 11:48 am
Forum: General discussion
Topic: ISO GPIO pins 41-x expander
Replies: 7
Views: 715

Re: ISO GPIO pins 41-x expander

As an aside, if you use the excellent wiringpi library, this will also let you address those pins using the same mechanism as you do for other pins. This assumes you use C or C++. Can anyone tell me if there is a python/python3 wrapper for the library that allows the same functionality? I am slowly ...

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