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by tpylkko
Sat Mar 23, 2019 9:13 pm
Forum: General discussion
Topic: WiFi temperature sensor for RPi3?
Replies: 24
Views: 16729

Re: WiFi temperature sensor for RPi3?

You might want to look into LiFePo4 batteries. These run at a around 3.3 V voltage meaning that you can directly run these 3.3 V microcontrollers from them (without the regulators and all)...
by tpylkko
Wed Mar 13, 2019 9:40 pm
Forum: General discussion
Topic: how can i burn an iso to a usb
Replies: 6
Views: 472

Re: how can i burn an iso to a usb

I just recently had to do this, so there are iso images out there that are not hybrid still...
by tpylkko
Thu Feb 07, 2019 11:28 am
Forum: General discussion
Topic: Running program on RPi
Replies: 5
Views: 351

Re: Running program on Raspberry Pi 3

You could use MQTT, for example. A very common way to use remote sensors on things like ESP8266 is this. You install an MQTT broker on the RPi which collects data from sensors which send then over the network. The Rpi then collects that data, stores it and allows people to view and plot it in differ...
by tpylkko
Tue Jan 29, 2019 3:02 pm
Forum: General discussion
Topic: WiFi temperature sensor for RPi3?
Replies: 24
Views: 16729

Re: WiFi temperature sensor for RPi3?

You can do this in many ways. The simplest is to use a ESP or similar microcontroller and analog temp sensor. It would be around $3 total. Digital sensors might be easier to use and more accurate but slightly more expensive. The microcontroller can also do other things, have a local oled display to ...
by tpylkko
Sun Jan 27, 2019 9:00 am
Forum: General discussion
Topic: Run script at login of specific user only
Replies: 19
Views: 1224

Re: Run script at login of specific user only

I don't understand what you are doing at all. Is it that your pi is on a cellular network without an ip address (NAT)? Or you are connecting to it and a local network over a mobile connection? What do you mean with 'cloud connection'?You say that you are also employing a VPN. How? Do you want to ope...
by tpylkko
Wed Jan 09, 2019 11:58 pm
Forum: General discussion
Topic: Default swap file size
Replies: 20
Views: 1474

Re: Default swap file size

What you say about 4k random read / writes is true. However, most if not all the other solutions offered above incur performance hits or othet compromises also. Besides, when you've already made the decision to use swap, you have already decided to sacrfice some performance. Who knows, maybe some pe...
by tpylkko
Fri Jan 04, 2019 6:45 am
Forum: General discussion
Topic: Default swap file size
Replies: 20
Views: 1474

Re: Default swap file size

There are two additional solutions to this problem. You need memory but you don't want to wear out your memory card with swap because they cost money. Solution candidate number 1: use swap but place the swapfile on a USB hard drive to avoid SD wear. Solution candidate number 2: use an extra cheapo m...
by tpylkko
Tue Jan 01, 2019 12:36 am
Forum: General discussion
Topic: Accessing a Pi remotely
Replies: 4
Views: 396

Re: Accessing a Pi remotelyq

There are many ways this can be done...in case I understand your question. Once downloaded you can have kodi show the folder as a network attached device using for example samba or nfs. You could also use dlna or upnp or a web interface to kodi that allows the client to view the content. There are p...
by tpylkko
Fri Dec 07, 2018 5:56 am
Forum: General discussion
Topic: Just about to buy Raspberry Pi for Media Centre and would appreciate help
Replies: 30
Views: 2001

Re: Just about to buy Raspberry Pi for Media Centre and would appreciate help

Here is a few things nobody mentioned. First there are standalone kodi images that you can install like libreelec, which might be handy if you are going to use it only as a media centre mostly. Second, you don't even necessarily need a keyboard or mouse with kodi since you control it with other devi...
by tpylkko
Sun Nov 11, 2018 12:50 pm
Forum: General discussion
Topic: How to run LibreOffice 6.1 on the Raspberry Pi 3
Replies: 3
Views: 1867

Re: How to run LibreOffice 6.1 on the Raspberry Pi 3

Is compiling it difficult? Personally I haven't tried...Or why do you do this? There are also several locations where you can get libreoffice compiled and packaged as a deb. Debian backports offers an arm64 build of Libreoffice 6.1. Does this not run on Raspbian if you have a pi with the 64-bit arm?...
by tpylkko
Sat Sep 01, 2018 10:35 am
Forum: General discussion
Topic: If RPi gets unplugged, sometimes it stalls during boot
Replies: 7
Views: 612

Re: If RPi gets unplugged, sometimes it stalls during boot

The most likely candidate is fsck, like mentioned earlier, because you are doing an unclean unmount when you pull the plug and Raspbian does a fsck on the disks. This takes some time. If you wait a bit longer it might come up. Or you can check for entries in journalctl (but may need to make the logs...
by tpylkko
Thu Apr 26, 2018 9:24 am
Forum: General discussion
Topic: Kivy and touchscreen at startup
Replies: 11
Views: 6426

Re: Kivy and touchscreen at startup

It appears to me that touch will not work with root user or any other user than pi for whatever reason, since "sudo" leads to it not working, a service file lacking "user=pi" also does not work and rc.local does not work (which you should not use anyway - but it is run as root also). Yet another way...
by tpylkko
Thu Apr 26, 2018 8:48 am
Forum: Advanced users
Topic: Web view straight into framebuffer
Replies: 6
Views: 1060

Re: Web view straight into framebuffer

no, like free as in the program/package that outputs RAM usage information.
by tpylkko
Tue Apr 24, 2018 8:51 pm
Forum: Advanced users
Topic: how to control gpio & relay in raspberry pi 3 using website
Replies: 6
Views: 1373

Re: how to control gpio & relay in raspberry pi 3 using website

Another option is to set it up on the local network and not on the internet, then use a VPN to connect from outside. But, this will, of course, be more suitable for some use cases than others.
by tpylkko
Mon Apr 23, 2018 7:28 pm
Forum: General discussion
Topic: is calibri & Helvetica font usable?
Replies: 14
Views: 2750

Re: is calibri & Helvetica font usable?

But it is important to realize that there are nearly identical looking free versions for all of these fonts Well I'm no font expert...if the name on the rpi & the "look alike" on the PC have different names, what are they? What I mean, is there a font "conversion chart" between the rpi & PC? I'm no...
by tpylkko
Sun Apr 22, 2018 9:44 pm
Forum: General discussion
Topic: is calibri & Helvetica font usable?
Replies: 14
Views: 2750

Re: is calibri & Helvetica font usable?

FWIW; Debian (and therefore Raspbian, I suspect) has a package called ttf-mscorefonts-installer, which will download and install some closed/proprietary microsoft fonts from microsoft.com on to the operating system. The fonts that ms allows you to use in this way don't have Helvetica or Calibri, how...
by tpylkko
Sun Apr 22, 2018 4:17 pm
Forum: General discussion
Topic: The Raspberry Pi Desktop OS 64 bit
Replies: 69
Views: 23866

Re: The Raspberry Pi Desktop OS 64 bit

Not to be pedantic - or actually why not? - but it is LowRISC. And IIRC they promised to deliver a working chip last year, now it is the middle of this year already and no word, so perhaps don't hold your breath.
by tpylkko
Fri Apr 20, 2018 12:55 pm
Forum: Advanced users
Topic: Can you run a website on several Raspberry Pis?
Replies: 3
Views: 414

Re: Can you run a website on several Raspberry Pis?

Also, you could use a docker swarm and employ containers

https://www.raspberrypi.org/blog/docker ... pberry-pi/

It would pretty much perfect for what you need AFAICS (load balancing web app)
by tpylkko
Tue Mar 13, 2018 3:52 pm
Forum: General discussion
Topic: Active RFID tag or BLE Beacon location sensing
Replies: 3
Views: 1005

Re: Active RFID tag or BLE Beacon location sensing

You could try triangulation techniques with bluetooth beacons or in combination with other techniques.
by tpylkko
Mon Jan 29, 2018 4:34 am
Forum: General discussion
Topic: Using Hard Drive with Raspberry Pi
Replies: 46
Views: 31388

Re: Using Hard Drive with Raspberry Pi

The dual USB connection won't do anything for the Pi, and in fact is not needed at all, which I explained in my first reply to this thread. [ Hmm. Yet the drive wont start with one cable connected. The drive attempts to start many times over and over again. With two connected it starts right away. ...
by tpylkko
Sun Jan 28, 2018 6:54 am
Forum: Advanced users
Topic: Long life microsd
Replies: 5
Views: 3147

Re: Long life microsd

The best advice I can give is don't buy cheap SD cards from sites like ebay , aliexpress etc.. Buy well known makes from well known suppliers, personally I have always used Kingston SD cards and have not had any problems even with 2 pi's running 24/7 collecting speed test results every 15 min. +1 j...
by tpylkko
Sun Jan 28, 2018 6:45 am
Forum: General discussion
Topic: Using Hard Drive with Raspberry Pi
Replies: 46
Views: 31388

Re: Using Hard Drive with Raspberry Pi

This thread is really long, so I didn't read it entirely, so excuse me if this was already mentioned. But I have a SATA to USB adapter that has two USB cables that go into one SATA. I have pulled old laptop harddrives and used them on a Pi with it. This will consume two USB ports from your pi but it...
by tpylkko
Thu Jan 25, 2018 8:40 pm
Forum: General discussion
Topic: Any way to turn the Pi Zero off except for an MCU + MOSFET?
Replies: 62
Views: 5316

Re: Any way to turn the Pi Zero off except for an MCU + MOSFET?

You should just try your idea. Maybe if you are lucky you wont have any problems. If you do get corruption, then you adjust. Maybe you can use picore and load the entire OS to RAM, then unmount, do the photo stuff, and later just pull the plug. There are these low power TTL serial cameras that can d...
by tpylkko
Wed Jan 24, 2018 9:39 pm
Forum: General discussion
Topic: looking for a simple and lightweight music player for PI ZERO
Replies: 14
Views: 10311

Re: looking for a simple and lightweight music player for PI ZERO

Volumio just uses MPD so the standard python binding for MPD will give you the ability to control it. Have used this in a prototype of an internet radio and I used python to 'tune' in to different stations. I believe I read on their page that they claim that they use a tweaked version of mpd, that ...

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