<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Matt,<div class=""><br class=""></div><div class="">I'm building an ESP8266 button too, not as a door bell, but to switch my VPN off when I want to watch Netflix. I'm using Peter Jenning's "The Button" (<a href="https://benlo.com/esp8266/esp8266Projects.html" class="">https://benlo.com/esp8266/esp8266Projects.html</a>) as a base to work from. As an interesting aside, Peter Jennings is the guy behind 1970s MicroChess and VisiCalc (<a href="https://en.wikipedia.org/wiki/Peter_R._Jennings" class="">https://en.wikipedia.org/wiki/Peter_R._Jennings</a>).</div><div class=""><br class=""></div><div class="">His design has the switch break the entire circuit when it's off, so that you can run it of 2xAAA batteries without a voltage regulator. Total cost <£5 including enclosure, so cheaper than an Amazon Dash button.</div><div class=""><br class=""></div><div class="">I'm busy designing a PCB in Fritzing and will probably just mill it on the hackspace's CNC mill. For suggested board house, I think you may find the manufacturing links on the hackspace website very helpful: <a href="http://swansea.hackspace.org.uk/Resources/Links" class="">http://swansea.hackspace.org.uk/Resources/Links</a> . I can personally recommend <a href="http://ragworm.eu/" class="">http://ragworm.eu/</a> as I've used them before.</div><div class=""><br class=""></div><div class="">Cheers,</div><div class="">Gerrit</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 30 Jun 2017, at 10:08, Matthew Daubney <<a href="mailto:matt@daubers.co.uk" class="">matt@daubers.co.uk</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="">Hello!</div><div class=""><br class=""></div><div class="">I started looking into making one of these quite some time ago, and it's finally come around on the list of things to do. I'm happy getting the vast majority of stuff working, what I'm really unsure of and struggle to understand is how to build a latching, releasable transistor switch so the thing comes on with button, then turns itself off when it's done.</div><div class=""><br class=""></div><div class="">Could anyone walk me through one of these and tell me what kind of transistors I need to build a prototype? Are there also any suggested board houses that people use?</div><div class=""><br class=""></div><div class="">Thanks,</div><div class=""><br class=""></div><div class="">Matt Daubney<br class=""></div></div>
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