What? You have a wall outlet to power the mill. There is obviously power in the wall output. The switch uses just a few milliwatts.
This does work. I've got several of these little switches. Of course the computer can not use WiFi to turn itself on. You need a human to somehow kick-start the process. But it should be automated after that. Of course the computer *can* turn itself off. I've managed to put the "on" button on a phone or indoor PC. One thing I want to change with my setup is to configure the computer for "Wake on LAN". I want the computer to power down to a "deep sleep" mode and also power off the tools and lights. Then when someone (or some software) pings the Ethernet port, the computer wakes up and turns on the equipment. But I admit to not yet understanding how wake-on-LAN works but I do know it is a kind of "on switch" that I could trigger. That once the computer is awake it can run whatever software I like. But the Raspbery Pi lacks Wake-on-LAN hardware. Most other PCs have this. In my shop I use just one computer to run the milling machine and 3D printer and to stream video so I can monitor progress remotely. I placed one length of tack lighting on the remote switch so the computer can control lights for the video stream. It works well enough but I need to explore wake-on lan. One more technology that is kind of new is "IFTTT-like" services. At first, it seems complex and overkill but then you find uses for it. The most well known is a web site called "IFTTT" where you can program events that are triggered by other evens up to many levels. Say your motion detection camera is triggered, so you program the security lights to come on and then if more motion is detected within 4 minutes the system should send you a text message. You can write programs like this with just a few clicks on a web page. People don't like paying for an IFTTT subscription so there are a dozen open source replacements for this. A system like this might be useful in a larger size machine shop. Security, fire alarms and lights, power to the tools and computers and so on can all be automated https://medevel.com/open-source-zapier-ifttt-alternatives/ Yes, overkill for a home shop but endless amusement for technology geeks. On Tue, Feb 15, 2022 at 11:50 AM Thaddeus Waldner <thadw...@gmail.com> wrote: > Thanks for all the ideas. > > I don’t think a WiFi solution will work because I want to completely power > down the system. There’s not too much power, as I would only need to switch > the control power; all the high power circuits need only be switched > through their respective relays. > > One other idea is to latch the power on via the 3.3v power supply on the > pi, which can apparently be configured to turn off when the pi is shut > down. > > Then run a script that waits for a gpio input and shuts down. > > > > > On Feb 15, 2022, at 11:57 AM, gene heskett <ghesk...@shentel.net> wrote: > > > > On Tuesday, February 15, 2022 11:10:30 AM EST Greg Bernard wrote: > >> Perhaps this is what you're looking for? > >> http://www.mosaic-industries.com/embedded-systems/microcontroller-proje > >> cts/raspberry-pi/on-off-power-controller > > > > Sweet, the perfect companion to my idea. > > Bookmarked for future reference, thanks Greg. > > > >> On Tue, Feb 15, 2022 at 8:28 AM Thaddeus Waldner <thadw...@gmail.com> > > wrote: > >>> On a small cnc machine run by a raspberry pi, I’d like to set up the > >>> main power to accomplish the following: > >>> > >>> 1)pressing the power button/flipping the switch turns on the machine > >>> > >>> 2) pressing the off button, the pi should first perform a shutdown > >>> then turn off the main power to all control power supplies. > >>> > >>> 3) shutting down the pi via the user interface turns off main power > >>> to all control power supplies when finished. > >>> > >>> I’m considering installing one of those powered mains disconnect > >>> switches, the likes of what you find in office photocopiers and > >>> industrial cnc machines. > >>> > >>> Any ideas? > >>> > >>> > >>> > >>> _______________________________________________ > >>> Emc-users mailing list > >>> Emc-users@lists.sourceforge.net > >>> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > Cheers, Gene Heskett. > > -- > > "There are four boxes to be used in defense of liberty: > > soap, ballot, jury, and ammo. Please use in that order." > > -Ed Howdershelt (Author, 1940) > > If we desire respect for the law, we must first make the law respectable. > > - Louis D. Brandeis > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > > > > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
