The 'Raspberry Pi' thread

Discussion in 'Other CPUs and chipsets' started by HyRax1, May 8, 2011.

  1. Ratzz

    Ratzz Member

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    As people may know if they have seen my latest build thread, I'm creating an all in one PC. Part of it consists of a pair of LM1875T amps, to run my onboard speakers, which will be the first electronic thing I have ever really built from scratch. Still waiting on my amps, I expect them to arrive this week sometime. That will be a new learning experience for me, but it looks easy enough. Looking forward to it !!

    A quick look at the front of the rig will show you a rectangular bit of wasted space I want to fill with something.

    [​IMG]

    I'm considering using this space for an LCD touchscreen display. Currently 246W, 138H, 136D, but these dimensions could be altered within reason if I went for a slightly larger (10") LCD.

    It appears the cheapest way to go would be to simply buy a yumcha Android tablet, but I'm not sure this will really suit my desires. I want the thing to display a large clock, and a couple of temp displays by default, at boot. Although I'm sure I can attach a couple of temp sensors to a Pi, I'm not so sure about doing the same to an Android, and also not so sure I can make them default to my desired layout of single large clock and 2 smaller temp displays.

    Of course, I would hopefully use the Pi for other purposes too.. I'm thinking alternative media player at the moment, since although it will draw power from an 'always on' USB port on my main rig, it might mean I can use it as a music player, using the same amps, without booting the PC. I would plan on leaving the Pi permanently on, so it won't be booting very often, but if I did disconnect it, it would be way cool if it just booted straight into Time/Temps without any BS. I presume I'd have to add a battery backup too... all things I think a Pi could do but a cheap Android tablet may not be configurable enough.

    I have no idea about Raspbian or other suitable OS, can I get a preconfigured SD card or do I need to actually learn a bit to use one of these things? Are any OCAU people willing to help me out with questions if I go this route? Can I buy cheapish external temp sensors (with cables) that just plug in, a quick google is inconclusive? I realise I'd have to configure those, again, I would ask for help in doing so.

    I've been thinking a setup like the video below might be a go, I'd certainly have the room to attach the Pi to the back of the screen and have plenty of room to spare, and access, to provide power and any additional stuff to it.



    Thanks in advance for any ideas or assistance !!
     
    Last edited: Aug 26, 2018
  2. MUTMAN

    MUTMAN Member

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    on the hardware side - temp sensor's are dead easy, they are three wires and a resistor. for a silly accurate input the dallas temp sensor ds18b2 is 0.05C if you want ..

    i run a hifiberry dac+ 'HAT DAC" on a pi with the 7" LCD. So its a bit fat at the back, but it pumps out fantastic sound quality via SPDIF to my amp (stock pi analog out is a little rubbish for quality) with a touch screen for local control. pi runs a little distro called pCP, but it wont be anygood for what you're after.
    plenty of distro's that will do what you want. burning an SD card for the pi is trivial, but you can buy a 'NOOBS' card for a small price that comes pre-loaded with a few distros

    [​IMG]

    [​IMG]

    [​IMG]
     

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    Last edited: Aug 26, 2018
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  3. Ratzz

    Ratzz Member

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    Nice :) I've noticed on many of the sites I've been checking out that 'hats' can be worth more than the Pi itself. I did see one hat with 'temp sensors' but I gathered by the description that they were onboard, and it was a lot more than a cost of the Pi itself. That hat had many more sensors than just temp though.

    I'm not sure that I need the DAC, unless its relatively cheap, since I'm just using a couple of LM1875T amps and a pair of 4" speakers, but of course if its not insanely expensive, its an option.

    That's one hell of a stack. I note that yours is open air.. how would it go for cooling in my enclosed space? Would I need to stick a fan in the back of the enclosure?

    Where would I get a custom distro made that suits an exact set of options (which I haven't selected yet :lol: ) put together, would it cost a mint, or alternatively how difficult is it for a noob to customise a 'NOOBS' card such as the one you suggested to suit my purposes? Just a few lines of code, or a shitload of expertise?
     
  4. MUTMAN

    MUTMAN Member

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    pi3 runs warmish when pushed hard. but thats not a problem really. I had a pi3 in a small case with just a old ram heatsink on the core and ran it at 100% no worries.
    realistically you could just run the 'rasberian' OS that is the main raspberry pi OS (its a linux debian desktop called 'pixel') and its just like a regular desktop OS in operation.
    add a music player, no worries
    run a python script to display temps, no worries
    have the the two side by side, no idea sorry. but i imagine you wont be the first to want to do it.

    have a look through the old 'magpie' mags for different projects that are documented and will have loads of support in the pi forums
    https://www.raspberrypi.org/magpi/
     
  5. MUTMAN

    MUTMAN Member

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    forgot to mention, but probably too late now by the looks of it, there are HATs with amps included.
    IQaudio and hifiberry both have a decent version
     
  6. pantner

    pantner Member

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    Recently found out about Pi-Hole

    https://pi-hole.net/

    Basically, you set it up to handle your DNS requests and you can setup block lists for certain domains.

    I have it running in a VM as it will run on normal Linux too, but also works very well on a Raspberry Pi. I have 3 workmates using it
     
  7. darknebula

    darknebula Member

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    You can also run Home Assistant on the PI and Pi-Hole runs as a docker add-on alongside it
     
  8. elvis

    elvis Old school old fool

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    Anyone gotten an e-Ink display working on their Pi?
     
  9. dakiller

    dakiller (Oscillating & Impeding)

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    Got a display in mind? I might be able to find something that will interface it.

    How do e-ink displays handle computer refresh rates? I thought that they were really slow
     
  10. elvis

    elvis Old school old fool

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    They are quite slow, but I was looking at building a large (A4 sized) GameBoy clone with an e-Ink display, primarily for playing black and white JRPGs (Pokemon, etc).

    Refresh speed would be poor, but the style of game I'm looking at I think would work despite the limitation. And being portable and viewable in full sunlight would be a design goal.

    I didn't have a particular display in mind. AliExpress have a few that appear easy enough to connect with an IO board in between, but all of them are a lot smaller than i want. It seems that features like more colours (black and red, black and yellow, etc) are becoming popular, but sizes don't go much over the usual 2-3" diagonal. I'm looking for about twice that size?

    Here's a few videos of folks hacking Nooks to run emulators. (Turn down the shitty music). I'd still rather stick with a device like an RPi than try to hack up a Nook. But interesting to see the refresh rates in action (not as bad as I expected - and again for turn based JRPGs, maybe not an issue?).









     
    Last edited: Oct 5, 2018
  11. GumbyNoTalent

    GumbyNoTalent Member

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    On an arduino and esp32, yes.

    I was thinking of doing a mini gameboy using these, which I brought and are on there way.
    Raspberry Pi Zero
    https://www.aliexpress.com/item/Ras...video-output-Presell-advance/32566751770.html

    1.4" screen with joystick pad and 3 buttons
    https://www.aliexpress.com/item/Ras...els-SPI-interface-Compatible/32897838543.html

    Also found a resistive touch screen, 2.8" for Pi.
    https://www.aliexpress.com/item/Ras...y-TFT-LCD-Panel-Module-320-x/32913784292.html
     
  12. MUTMAN

    MUTMAN Member

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    e-ink seems terribly expensive at A4 sizes ....
    add a controller in the mix and it blows out quickly
    ???
    or am i missing something ?
     
  13. elvis

    elvis Old school old fool

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    Nah, that's too small.

    I don't need the display itself at A4. I want to make an accurately scaled GameBoy approximately 4 times (2x width, 2x height, leave the depth the same or less) the size of the original. That puts it at around A4 / large iPad size all up. The screen itself needs to be around twice the dimensions of the original, which was a 47mm x 43mm screen.

    I love the idea of e-ink as a display that can be used out doors.

    The intended recipient for the device (who doesn't know it yet) is a huge Pokemon fan. So the idea is to make it mostly about those games.

    The alternative idea is a much larger GameBoy (about 3" high) with just a regular PC LCD screen as the display. Certainly not mobile, but an amusing novelty.
     
  14. cvidler

    cvidler Member

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    does it have to be e-ink for any reason? you can still get transflective LCDs (like the original gameboy), very workable in bright light (and with 30 years of development since, probably nicer than the original).
     
  15. elvis

    elvis Old school old fool

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    Pure novelty value. :lol:

    Yeah, that'll likely be my fallback if e-Ink is unreasonably expensive (which I'm assuming it will be).
     
  16. pantner

    pantner Member

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    Anyone using the official POE Hat for the 3? If so, thoughts?
     
  17. dakiller

    dakiller (Oscillating & Impeding)

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    Nothing personally

     
  18. cvidler

    cvidler Member

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    EEVbloh on youtube has done a review, it's got some fundamental problems.

    and dakiller beat me...
     
  19. pantner

    pantner Member

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    great... How are they still selling them when there is a known issue like that?

    Mine is already on it's way, I only have a USB receiver for a wireless keyboard connected, so hopefully mine will work ok.
     
  20. MUTMAN

    MUTMAN Member

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    Isolation slot ? Isnt that for the camera connector ?
    God that guy is annoying. I cant listen for more than 5 minutes. His voice :(
     
    Last edited: Oct 7, 2018

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