TWiT Throwback (Video)

TWiT Throwback (Video)

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TWiT Throwback (Video) episodes

  • Know How... 132: Wearable Airbag, PWM Explained, & Feedback

    Wearable Airbag, Pulse Width Modulation explained, Smitty shows how to make a clock using meters, Google Plus feedback, and more.

    PWM Explained

    "Pulse Width Modulation"

  • It's a way to encode a message into a pulsing signal.
  • In other words, if you have a signal that can be either on or off (digital), you can modulate the signal to represent more than on and off.

    • Let's talk about Digital vs. Analog

  • Take a analog 5-volt circuit: It has an INFINITE number of values between 0 volts and 5 volts. As long as you have equipment that is sensitive to generate and detect EXACTLY how much voltage is being sent, there is no limit to the number of values you can send.
  • Take a digital 5-volt circuit: It has TWO values -- On and Off -- zero volts and five volts.

    • It would seem that digital can't approximate analog because of the vast difference in their theoritical values, but it CAN... if you take that circuit and slave it to a clock that switches between on and off at regular intervals.

    That's what PWM does!

  • Take that same 5-volt digital circuit, but now place it behind a clock that cycles once every second.
  • If the circuit stays off for the full second, that's "0"
  • If the circuit stays on for the full second, that's "5"
  • HOWEVER... if the circuit stays on for 1/5 of the second, that's "1"
  • If the circuit stays on for 3/5 of the second, that's "3"
  • If the circuit stays on for 1/2 of the second, that's "2.5"

    • By changing the width of each pulse, we can use a digital signal to approximate an analog one. And in approximating that analog signal, we can send data.

    However... it's not just data... we can approximate VOLTAGES by using PWM!

    Hosts: Bryan Burnett and Fr. Robert Ballecer, SJ

    Connect with us!

    Don't forget to check out our large library of projects at https://twit.tv/shows/know-how.

    Tweet at us at @padresj, @Cranky_Hippo, and @Anelf3

    Sponsor:

    • smartthings.com/twit use code TWIT

      • 50 min
    • Marketing Mavericks 44: How To Build a Community on Twitter

      We talk about the importance of building a community before the brand and building a community on Twitter

      Host: Tonya Hall

      Guests: Scott Eddy and Alex de Carvalho

      Producer: Tonya Hall

      Download or subscribe to this show at https://twit.tv/shows/marketing-mavericks.

      Thanks to CacheFly for the bandwidth for this show.

      58 min
    • Tech News Today 1204: The FCC Votes YES on Net Neutrality

      The FCC votes on net neutrality, Google may break Google+ into pieces, how to spend $75,000 on the Apple Watch, and more...

      Host: Mike Elgan

      Co-Host: Elise Hu

      Guests: Drew FitzGerald, Miguel Helft, and Brad Linder

      Download or subscribe to this show at https://twit.tv/shows/tech-news-today.

      Check out the full show notes for today's episode.

      Thanks to CacheFly for the bandwidth for this show.

      Sponsors:

      • blueapron.com/twit
      • Gazelle.com

        • 45 min
      • Ham Nation 185: Hello New Hams!

        New ham Christian Cudnik, building a field strength meter, iOS apps for amateur radio and more!

        Hosts: Bob Heil, Gordon West, George Thomas, Don Wilbanks, Dale Puckett, and Amanda Alden

        Guests: Chris Wilson and Christian Cudnik

        Download or subscribe to this show at https://twit.tv/shows/ham-nation.

        Thanks to Joe Walsh who wrote and plays the Ham Nation theme.

        Thanks to CacheFly for the bandwidth for this show.

        Sponsors:

        • dxengineering.com/hamnation
        • IcomAmerica.com/hamnation

          • 1 hr 11 min
        • Android App Arena 34: Battery

          A round-up of apps to manage your device's battery usage with Battery Percent Enabler, Battery Panic, Battery Widget Reborn, GSam Battery Monitor Pro, as well as a look at the new YouTube Kids app!

          Host: Jason Howell

          Download or subscribe to this show at https://twit.tv/shows/android-app-arena.

          Bandwidth for Android App Arena is provided by CacheFly.

          Sponsor:

          • meundies.com/twit

            • 18 min
          • This Week in Google 289: L'il Rick

            New Motorola Moto E, 50,000 songs online with Google Play Music, Inbox now in more places, Calendar for Android adds 7-day view, and more.

            Hosts: Leo Laporte and Jeff Jarvis

            Guest: Kevin Tofel

            Download or subscribe to this show at https://twit.tv/shows/this-week-in-google.

            Thanks to CacheFly for the bandwidth for this show.

            Sponsors:

            • HipChat.com/twig
            • naturebox.com/twit
            • ldproducts.com/twit offer code TWIT

              • 2 hr 7 min
            • Tech News 2Night 282: Loop, Apple, and Google Pay

              Your wallet is not welcome here, it's bring your Google-to-work day, Lenovo gets hit by the Lizard Squad, you can no longer do "that" on television, and more...

              Host: Megan Morrone

              Guest: Dan Rowinski

              Download or subscribe to this show at https://twit.tv/shows/tech-news-2night.

              Bandwidth for Tech News 2Night is provided by CacheFly.

              Sponsor:

              • personalcapital.com/tn2

                • 23 min
              • Windows Weekly 402: Watch Your Squad

                Windows 10 will have a Start menu replacement by Stardock, Microsoft Band and Health updated, Outlook.com is losing Facebook Chat and Skype Chat support, Microsoft opens up OneDrive APIs, VMware on it's way to Azure, handwriting and drawing comes to OneNote for iPad, March Xbox System Updates to include screenshots, and how to get another 100GB of free OneDrive storage for 2 years!

                Hosts: Leo Laporte, Mary Jo Foley, and Paul Thurrott

                Download or subscribe to this show at https://twit.tv/shows/windows-weekly.

                Check out Mary Jo's blog at the AllAboutMicrosoft.com.

                Thanks to CacheFly for the bandwidth for this show. The Windows Weekly theme music is courtesy of Derek K. Miller.

                Sponsors:

                • gonitro.com/twit
                • legalzoom.com offer code WW

                  • 1 hr 45 min
                • FLOSS Weekly 326: The Open Source Initiative

                  This week we are joined by Simon Phipps and Patrick Masson to talk about the Open Source Initiative (OSI). The Open Source Initiative (OSI) is a global non-profit that supports and promotes the open source movement. Among other things, the OSI maintains the Open Source Definition, and a list of licenses that comply with that definition.

                  Hosts: Randal Schwartz and Dan Lynch

                  Guests: Patrick Masson and Simon Phipps

                  Download or subscribe to this show at https://twit.tv/shows/floss-weekly.

                  Thanks to CacheFly for providing the bandwidth for this podcast, and Lullabot's Jeff Robbins, web designer and musician, for our theme music.

                  1 hr 1 min

                About TWiT Throwback (Video)

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