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COTB

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About COTB

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  • Birthday 01/01/1900
  1. COTB

    C.H.I.P. Board Notes

    Here's a series of notes on the NextThingCo C.H.I.P. computer module. At the moment they are in no particular order. The notes all refer to the original CHIP and not the CHIP-Pro embedded module. Due to the nature of the product this is all very command line orientated and we (mostly) eschew Graphics User Interfaces (windowing). Bluetooth Yes, the CHIP has Bluetooth capability but you need to work at it a little. The key here is the bluetoothctl utility. Mileage may vary but getting bluetooth peripherals to pair/connect and finally function boils down to: bluetoothctl scan I found that it was necessary to turn on the agent in order to get my bluetooth keyboards to function. Pairing and a successful connection simply isn't enough. agent on connect 00:11:22:33:44 Note that command completion (using TAB) works at the bluetoothctl prompt, which is a huge relief when using the toy keyboard on a PocketCHIP! This also works for the bluetooth device number: once seen it's only necessary to type the first couple of unique characters before hitting the TAB. Stuck in GUI Mode? So you did the... sudo apt-get install xfce4 ... and are now stuck in the (fairly useless for embedded applications) xfce4 environment? You're seriously contemplating a reflash! Use systemctl to change the default boot with a symlink: systemctl set-default multi-user.target To change back to booting to the GUI: systemctl set-default graphical.target Note that this will kick you into raw full screen console mode, with the various consoles accessible by the usual Alt+F1 to F? key sequences. As it's proper text mode for the display (not a windowing environment) the text will be bolder and look less enhanced, but IMHO it's more readable. Battery Connector The tiny white battery connector on the C.H.I.P. is a JST-2.0 PH. You can buy them here already terminated, rather cheaply, and without any postage charges. Make sure you chose the 2 pin size. If you are a member of our forums here, and have at least ten meaningful posts to your credit, I will post you two free ones if you simply PM me with your mail address.
  2. The short answer seems to be YES... but wait... C.H.I.P. started as a crowdfunding exercise to a huge fanfare including spots on US National media, but the price was obviously set unrealistically low, and attempts to hike the price with a so-called Pro version - which actually seemed a weaker product for far more money - looks to have fooled no one. Unlike many poor punters I received the three I ordered in early 2016, but after almost a year's painful wait. In future weeks we'll see exactly what we can do with them using stripboard for expansion. Miraculously the company's forum is still going (except that no one seems to know why seeing that the money for everything else ran out months back). Some of that forum's members are cloning the data anticipating it will disappear from the internet some time soon, so there's hope of other life-after-death too.
  3. COTB

    The Crystal a-Maze

    A Beginner's Project With Possibilities There's an amazingly cheap project available from multiple Chinese sellers that offers a good starting point for someone who has never built an electronics gismo before. It's a tester that's good for go/nogo and frequency identification of crystals up to around 50Mh/z. In theory it should check ceramic resonators and filters too, and maybe it has other uses, like a frequency meter or maybe - with a lille insight - can be used to indirectly measure inductance and capacitance. I bought mine here for only £2.11 (British Pounds) and that included the shipping from China! They vendor wants a massive £0.25 shipping now though! I've been looking at the little bag of parts for a couple of weeks now, so it's time to get the soldering iron out...
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