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  • Author Author: a531016
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David's HLH Build Part 3

a531016

I am going to keep this update brief as a bit of a tease!

 

The breadboard is now complete, so I can now focus on how all the working components are going to squeeze in and work together.

 

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I have also spent some time in Autodesk Fusion 360 designing the 3D printed parts.

 

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As I stated in my declaration, I wanted to learn and improve what I know, and I am certainly doing that. I don't want to give too much away, but all will be revealed in the video!

 

What do you think of the concept, I am trying to keep it small enough to be pocketable! Any advice? What would you like to see?

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  • Looking good.  You seem to have gotten the component count (and sizes) down to a bare minimum.  Any idea on the runtime for a single Li-ion cell?

    Good luck and keep pushing.

    Gene

  • in reply to genebren

    Thank you!

     

    And a very good question! The quoted capacity of the boosted output is 2,500 mAh at 5V (the cell itself 3.7V at 9.62Wh). This should give me 12.5 Watt Hour. Although I can find plenty of data on the RPI 0 (180 mA) the screen seems to be a bit of a mystery. I guess the worst case is that it draws 1.1 A @ 5V or 5.5 Watts (the boost circuit is limited to 1.2A) so in theory, I should get just over 2 hours?

     

    The best way to know is to stick an ammeter in there while I am wiring up the power switch. Or just try it of course! Either way, thought the testing and debugging, I have probably run it for an hour already, and the cell has only dropped from 3.9V to 3.7V, so it looks promising!

  • in reply to a531016

    you lucky guy...my Setup draws so much current I had to Switch to a 2cell Lipo to dirstribute the load.
    but I get about 2,5hours runtime.

     

    How are you approaching the Sound issue with the pi Zero (Gpio or snitching it off the hdmi? or got another idea?)

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