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Most elegant solution for battery power and 5v rail on quick start? — Parallax Forums

Most elegant solution for battery power and 5v rail on quick start?

rwgast_logicdesignrwgast_logicdesign Posts: 1,464
edited 2013-01-11 07:42 in Propeller 1
I want to use a quickstart to run sphinx, and that requires a keyboard, which requires 5v. Id also like the board not depend on a USB port.

Would just using a USB wal wart and connecting the keyboard to the USB_POWER_EN pin be the best solution? Or would I be better off just adding a 5v regulator to the set up and powering the quick start from that? I want to keep this fairly simple and compact. I have other board that would make this alot easier but I would like to finally use my quick start, and it also has 8 buttons and LEDs which will be very useful for using it as a self contained learning platform

Comments

  • cavelambcavelamb Posts: 720
    edited 2013-01-09 15:22
    Sorry - missed the battery requirement in the title - in 24 point.

    Maybe this will be more appropriate?
    Angles header pins soldered to the battery leads.
    Four AA cells will run a keyboard just fine.

    DSCF3918A.JPG
    DSCF3918A.JPG
    640 x 480 - 55K
  • RaymanRayman Posts: 14,666
    edited 2013-01-09 15:49
    You might look at what I did for the Merlin and MerlinA boards... Used a diode and a regulator...
  • softconsoftcon Posts: 217
    edited 2013-01-10 10:41
    I know you said you want the buttons still, but if you get the human interface board from parallax, you can plug in the power supply (7.5 volt) also available from parallax, and you'll have everything you need. This is exactly the setup I used to introduce my 10-year-old son to femtobasic.
    And, since the human interface board already has keyboard, and 5v power, (not that you'll need the 5v anymore since it already has keyboard ports) everything will work for you, and you won't even have to solder anything. :)
  • skylightskylight Posts: 1,915
    edited 2013-01-11 07:42
    A bit of a squeeze especially for my size fingers but it's possible to run a fingertip under the HIB to reach the quickstart buttons.

    I wonder if the 40 pin header was double ganged and the posts as well that would give more room to get sausage fingers like mine onto the touchbuttons



    Just to add, I believe you have to be careful not to have USB and battery power connected at the same time on just the quickstart whereas if using the HIB quickstart combo it's ok powering both boards from the HIB power socket, plugging in the USB then just resets the quickstart. That's the way I understand it by the documentation.
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