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vgr's profile
Venkatesh Rao
Venkatesh Rao
Venkatesh Rao
@vgr

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Venkatesh Rao

@vgr

This is my conversational account. For my work follow @ribbonfarm, @breaking_smart, @artofgig. Tweets are 90% vacuous views, apathetically held. Mediocritopian.

Los Angeles, CA
venkateshrao.com
Joined August 2007

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    Venkatesh Rao‏ @vgr 8 Sep 2019
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    Request for hardware startup: a battery charge level indicator part under $5 (for both rechargeable sand non). @theartlav and I had a brief slack discussion (see screenshots) on why this is a hard problem that’s important and useful to solve. Any bright ideas?pic.twitter.com/d7smGgBfdM

    11:56 AM - 8 Sep 2019
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    • Carl Franzen Billy Smith Timothy #masks4all Roy mental blanking interval Vigorous Pigeon Rahul Ramchandani Jim V.o.R. jo
    5 replies 0 retweets 8 likes
      1. Venkatesh Rao‏ @vgr 8 Sep 2019
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        Who to tag for this? @NickPinkston any ideas?

        2 replies 0 retweets 0 likes
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      2. Ivan Kozik‏ @ivankozik 8 Sep 2019
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        Replying to @vgr @theartlav

        https://www.google.com/search?tbm=isch&q=duracell+power+check …

        1 reply 0 retweets 0 likes
      3. Venkatesh Rao‏ @vgr 8 Sep 2019
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        Replying to @ivankozik @theartlav

        I don’t mean stand-alone. I mean one that can be easily integrated into devices that might have unpredictable batteries inserted.

        0 replies 0 retweets 1 like
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      2. Chris Rentsch‏ @crentsch 8 Sep 2019
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        Replying to @vgr @theartlav

        One solution is a simple voltmeter since most batteries demonstrate a decrease in potential (voltage) as they die. Many inexpensive battery testers are voltmeters of appropriate range with the units erased and a red/yellow/green bar placed instead:pic.twitter.com/x1lWSsTtch

        1 reply 0 retweets 1 like
      3. Chris Rentsch‏ @crentsch 8 Sep 2019
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        Replying to @crentsch @vgr @theartlav

        A reason devices don't permanently display voltage (remaining capacity) is because you have to put a load on the battery to get an accurate reading. If it kept the battery loaded at all times, it would deplete itself. Absent a load, even dead batteries can test full w/voltmeter.

        0 replies 0 retweets 1 like
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      1. Jens Glathe‏ @jgl_oldschool 8 Sep 2019
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        Replying to @vgr @theartlav

        You get a lot of useful info from a pulse load and the response of the battery. Would be surprised if this isn't already baked into the common charging controller chips. More an interface question than anything else.

        0 replies 0 retweets 1 like
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      1. Billy Smith‏ @billy74919063 8 Sep 2019
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        Replying to @vgr @theartlav

        Most rechargable batteries for cordless power tools have this as a standard feature now. They're on three of the batteries that i bought in the last two years.

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