http://www.raspberryvi.org/enContents © 2021-02-27 09:57 <a href="mailto:mike@raspberryvi.org">Mike Ray</a> <a rel="license"> <p>Unless otherwise stated all content released under the <a href="http://creativecommons.org/licenses/by-nc-sa/4.0/"> <img alt="Creative Commons License BY-NC-SA" style="border-width:0; margin-bottom:0px;" src="http://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png"> </a> </p> Sat, 27 Feb 2021 09:57:28 GMTNikola (getnikola.com)http://blogs.law.harvard.edu/tech/rsshttp://www.raspberryvi.org/posts/install-sigrok.htmlMike Ray<div><p>This post carries a link to a script which will install all of the dependencies for, and then install:</p> <ul> <li>sigrok-cli</li> <li>pulseview</li> </ul> <p>On a <a href="https://www.raspberrypi.org/">Raspberry Pi</a> running an upstream Debian distribution, including Raspbian (now called Raspberry Pi OS).</p> <p><a href="http://www.raspberryvi.org/posts/install-sigrok.html">Read more…</a> (1 min remaining to read)</p></div>electronicsRaspberry Pitest equipmenthttp://www.raspberryvi.org/posts/install-sigrok.htmlThu, 25 Feb 2021 20:02:03 GMThttp://www.raspberryvi.org/posts/pull-up-and-pull-down-resistors.htmlMike Ray<div><h3 class="no_toc" id="table-of-contents">Table of Contents</h3> <ul id="markdown-toc"> <li><a href="http://www.raspberryvi.org/posts/pull-up-and-pull-down-resistors.html#introduction" id="markdown-toc-introduction">Introduction</a></li> <li><a href="http://www.raspberryvi.org/posts/pull-up-and-pull-down-resistors.html#logic-levels-and-gpio-pin-states" id="markdown-toc-logic-levels-and-gpio-pin-states">Logic Levels and GPIO Pin States</a></li> <li><a href="http://www.raspberryvi.org/posts/pull-up-and-pull-down-resistors.html#a-potential-divider" id="markdown-toc-a-potential-divider">A Potential Divider</a></li> <li><a href="http://www.raspberryvi.org/posts/pull-up-and-pull-down-resistors.html#resistor-and-button-as-potential-divider" id="markdown-toc-resistor-and-button-as-potential-divider">Resistor and Button as Potential Divider</a></li> <li><a href="http://www.raspberryvi.org/posts/pull-up-and-pull-down-resistors.html#the-circuit" id="markdown-toc-the-circuit">The circuit</a></li> <li><a href="http://www.raspberryvi.org/posts/pull-up-and-pull-down-resistors.html#short-circuit" id="markdown-toc-short-circuit">Short Circuit</a></li> <li><a href="http://www.raspberryvi.org/posts/pull-up-and-pull-down-resistors.html#limiting-current-flow" id="markdown-toc-limiting-current-flow">Limiting Current Flow</a></li> <li><a href="http://www.raspberryvi.org/posts/pull-up-and-pull-down-resistors.html#the-whole-circuit" id="markdown-toc-the-whole-circuit">The whole circuit</a></li> <li><a href="http://www.raspberryvi.org/posts/pull-up-and-pull-down-resistors.html#pull-down" id="markdown-toc-pull-down">Pull-down</a></li> <li><a href="http://www.raspberryvi.org/posts/pull-up-and-pull-down-resistors.html#switch-contact-bounce" id="markdown-toc-switch-contact-bounce">Switch Contact Bounce</a></li> <li><a href="http://www.raspberryvi.org/posts/pull-up-and-pull-down-resistors.html#internal-pull-up-and-pull-down-resistors" id="markdown-toc-internal-pull-up-and-pull-down-resistors">Internal pull-up and pull-down Resistors</a></li> <li><a href="http://www.raspberryvi.org/posts/pull-up-and-pull-down-resistors.html#edge-triggering" id="markdown-toc-edge-triggering">Edge-triggering</a></li> </ul> <p><a href="http://www.raspberryvi.org/posts/pull-up-and-pull-down-resistors.html">Read more…</a> (7 min remaining to read)</p></div>electronicsGPIORaspberry Pihttp://www.raspberryvi.org/posts/pull-up-and-pull-down-resistors.htmlThu, 25 Feb 2021 12:53:21 GMThttp://www.raspberryvi.org/posts/relaunch.htmlMike Ray<div><p>On the 25th of January 2021 this Web site was relaunched.</p> <p>I am now using a different host. See the link at the bottom of every page and post for details of this host.</p> <p>Some of the pages and articles which were on the previous version of the site have been removed. Some of these removals will be temporary, but some are permanent.</p> <p><a href="http://www.raspberryvi.org/posts/relaunch.html">Read more…</a> (1 min remaining to read)</p></div>Raspberry Pihttp://www.raspberryvi.org/posts/relaunch.htmlTue, 26 Jan 2021 20:28:06 GMThttp://www.raspberryvi.org/posts/vertical-webcam.htmlMike Ray<div><p>I regularly meet with other members of the Surrey Linux User Group on Jitsi. We have been doing this rather than meeting in person every month, during the pandemic of 2020 (and beyond?).</p> <p>In addition to this, of course, I often fiddle about with electronic gadgetry, and cannot always identify pins and other stuff without sighted assistance.</p> <p>So, I decided I needed a way to connect up a Webcam which would look downwards onto the desk, and in which other Jitsi users in the meetings would be able to see what was under the camera.</p> <p><a href="http://www.raspberryvi.org/posts/vertical-webcam.html">Read more…</a> (5 min remaining to read)</p></div>CameraHQ CameraRaspberry PiWebcamhttp://www.raspberryvi.org/posts/vertical-webcam.htmlThu, 31 Dec 2020 16:41:20 GMThttp://www.raspberryvi.org/posts/stuttering.htmlMike Ray<div><h3 id="note-added-23-march-2019"><em>NOTE</em> Added 23 March 2019</h3> <p>This is pretty late, but at some time during 2018 some kind of fix was made to the ALSA driver, and speech using the default espeakup in conjunction with speakup no longer stutters.</p> <p>This renders my solution, detailed in this article, no longer necessary.</p> <p>I leave this article here and the code downloads where they are, for reference, and in case problems re-appear.</p> <p>End of note.</p> <p><a href="http://www.raspberryvi.org/posts/stuttering.html">Read more…</a> (6 min remaining to read)</p></div>espeakOMXRaspberry PiScreen readerspeakupStutteringTTShttp://www.raspberryvi.org/posts/stuttering.htmlFri, 30 Dec 2016 16:59:43 GMT