sudo-discuss

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7524 discussions

vending machine homing switch mystery solved

by Jake

so i've been working on the black sudoroom vending machine (vending1): https://sudoroom.org/wiki/hack-o-mat which had previously been hacked by students at UC Berkeley (i think) I believe it's a Snacktron like Emma and Ed's machine. (unlike our brown vending machine which is a snackshop II) pictures of their machine can be seen here: http://spaz.org/~jake/pix/vend/ they had ripped out the original control unit, and wired it up with a bunch of reed relays and an arduino. The motors of the vending machine are wired as a grid of rows and columns, so the controller needs to be able to enable a single row and column in order to power one product motor. But it also needs to be able to detect when the product motor has rotated a full turn, and is back at the "home" position where it needs to stop. There's a "home" sensor on the back of the motor, but the way it's wired was a mystery for a while. Here's some pictures of the homing circuit: http://spaz.org/~jake/pix/vend/IMG_20160401_015211.jpg http://spaz.org/~jake/pix/vend/IMG_20160401_015700.jpg as you can see, the only difference between the button being pressed or not pressed, is that the 420nF capacitor is in parallel with the motor or not. Since the whole thing is in series with a diode (to protect against trying to turn a motor backwards) we were stumped as to how to detect whether a motor was homed or not. Thanks to Zach who donated some test equipment including this awesome signal generator (along with a nice power supply and bench multimeter): http://imgur.com/LTSFfOe I was able to connect an AC waveform in series with a 12VDC supply to one of the motors, and figure out how to detect whether the home switch is closed or not. Basically, you make a 31KHz (or similar frequency) squarewave in series with the power supply, and watch the current through the motor. If the button is open and the capacitor is not in-circuit, the motor's inductance absorbs the AC and the current draw is relatively smooth. But when the motor arrives at the home position (when you need to stop delivering product!) the capacitor gets switched in, and now you'll see a lot of the AC on the current path of the system. Here is a video showing the voltage across a 22-ohm series resistor while the motor is rotating with 12VDC: https://www.youtube.com/watch?v=xHIGDw5HRCg apparently it takes that motor about 11 seconds to dispense a product and finish returning to home position, assuming the product weighs nothing. by the way, you'll notice that i'm using the old analog oscilloscope. Unfortunately the LeCroy 9510 has started crashing, basically bluescreening. It probably needs to be opened up and cleaned, as it got wet after a fire before it was donated to sudoroom. Or maybe someone wants to donate a nicer oscilloscope to sudoroom? anyway, now I know how to detect the motor homing signal, and I just need to wire up this machine to its arduino to detect the signal and dispense product more accurately. If anyone wants to help, please let me know. by the way, if you are wondering how the UC students detected when the motors were finished dispensing product, the answer is absurd: they put a laser beam across the path where product would fall when dispensed, and they watched for the laser beam to be interrupted. did it work? I don't know. probably the semester ended and they got their grade and moved on, and then they donated the vending machine to us. -jake

10 years, 3 months

Schedule change and update from last meeting/hacknight and

by Marc Juul

Unless someone complains I'm dropping the Thursday evening events for now. That means that we have one weekly meeting only: Tuesday at 7:30 pm. Last meeting I was planning to prototype a 12v power cable. A couple of new meshers showed up though. I'm sure these won't be people who show up once and then never again since one is already an active sudo'er and the other is a ccl'er. I ended up intro-ing them to the mesh. One of them should be able to tie intro existing mesh connections in west oakland but needed approval from housemates, the other person has a view of lake merritt and he took a home node and picostation extender back with him :) Next Tuesday I want to try to solder those cables and we need to design a sticker that annotates what each port on the home node is used for so we don't have to manually make little notes/stickers every time. -- marc/juul

10 years, 3 months

Re: [sudo-discuss] dell server racks?

by robb

thx for the speedy response, jake! how many do we want? ;) On Fri, Apr 8, 2016 at 4:31 PM, Jake <jake(a)spaz.org> wrote: > nooooooo > > > On Fri, 8 Apr 2016, robb wrote: > > guy came to sudo asking if we want any dell server racks. >> he. claims they are nicer than the ones we have. >> he has 10 >> cheers >> ~r >> >> >>

10 years, 3 months

dell server racks?

by robb

guy came to sudo asking if we want any dell server racks. he. claims they are nicer than the ones we have. he has 10 cheers ~r

10 years, 3 months

Robogames

by Adam

Is this weekend in livermore. I'm considering going. Tickets are $30/day, but it may be worth it to see robots get smashed and go through varied challenges. Anyone else? - - - - Begin automatically generated footer - - - - Director of Research, Aperture Systems: http://aperture.systems Weblog: http://www.adammunich.com Cell: +1-650-452-0554, M-F 10a - 8p PST Note: To protect against computer viruses, e-mail programs may prevent sending or receiving certain types of file attachments. Check your e-mail security settings to determine how attachments are handled. Confidentiality Notice: This electronic mail transmission is intended for the use of the individual or entity to which it is addressed and may contain confidential and/or proprietary information belonging to the sender. If you are not the intended recipient, you are hereby notified that any disclosure, use, copying, distribution, or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this transmission in error, please notify the sender immediately by e-mail and delete the original message. Thank you for your cooperation.

10 years, 3 months

Re: [sudo-discuss] oscilloscope, power supply, signal generator "donation"

by Zach

Im going to hold on to the scope for now. Have fun with the bench supply and other gear. -Zach -------------------------------------------- On Fri, 4/8/16, Jake <jake(a)spaz.org> wrote: Subject: Re: [sudo-discuss] oscilloscope, power supply, signal generator "donation" To: "Anthony Di Franco" <di.franco(a)gmail.com> Cc: sudo-discuss(a)lists.sudoroom.org, "Zach T" <organic_unity(a)yahoo.com>, jacobmowbray(a)gmail.com Date: Friday, April 8, 2016, 12:24 PM Thanks Anthony! Why not the oscilloscope? Not enough room? Perhaps Jacob can pick it up, I think he was going to pick it all up himself originally. That oscilloscope apparently has some 16-line digital analyzer built in, could be really awesome. -jake On Fri, 8 Apr 2016, Anthony Di Franco wrote: > I got everything except the oscilloscope,[IMAGE] > > It's on the back bench. > > On Thu, Apr 7, 2016, 13:53 Jake <jake(a)spaz.org> wrote: > Zach wants to donate these nice pieces of test equipment to sudoroom: > > http://imgur.com/wZuPmi2 > http://imgur.com/LTSFfOe > http://imgur.com/oQQsfgc > > and Jacob M. has volunteered to go pick them up (although he doesn't have > a car and they're in SF) > > Does anyone with a car want to go to SF to pick them up? > > but Zach wants to know that he can get them back whenever he wants. > > Zach, Sudoroom can't guarantee the safety of your equipment that is left > there. But I can say that my LeCroy 9150 and Sorensen DCR-2025B and lots > of other good stuff are there and i'm not worried about them, and you > shouldn't worry either. If you ever need to come get these things back > you can do so. We appreciate you letting us use them in the meantime. > > -jake > _______________________________________________ > sudo-discuss mailing list > sudo-discuss(a)lists.sudoroom.org > https://sudoroom.org/lists/listinfo/sudo-discuss > > >

10 years, 3 months

oscilloscope, power supply, signal generator "donation"

by Jake

Zach wants to donate these nice pieces of test equipment to sudoroom: http://imgur.com/wZuPmi2 http://imgur.com/LTSFfOe http://imgur.com/oQQsfgc and Jacob M. has volunteered to go pick them up (although he doesn't have a car and they're in SF) Does anyone with a car want to go to SF to pick them up? but Zach wants to know that he can get them back whenever he wants. Zach, Sudoroom can't guarantee the safety of your equipment that is left there. But I can say that my LeCroy 9150 and Sorensen DCR-2025B and lots of other good stuff are there and i'm not worried about them, and you shouldn't worry either. If you ever need to come get these things back you can do so. We appreciate you letting us use them in the meantime. -jake

10 years, 3 months

Re: [sudo-discuss] oscilloscope, power supply, signal generator "donation

by robb

they are beautiful!!! we can always use another power supply & multimeter & i expect the function genie will come in handy when we start tuning tesla coils :P On Thu, Apr 7, 2016 at 4:47 PM, <sudo-discuss-request(a)lists.sudoroom.org> wrote: > Send sudo-discuss mailing list submissions to > sudo-discuss(a)lists.sudoroom.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://sudoroom.org/lists/listinfo/sudo-discuss > or, via email, send a message with subject or body 'help' to > sudo-discuss-request(a)lists.sudoroom.org > > You can reach the person managing the list at > sudo-discuss-owner(a)lists.sudoroom.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of sudo-discuss digest..." > > > Today's Topics: > > 1. Re: March emails? (Cere Misc) > 2. Re: mailman backlog (robb) > 3. Re: hello all (Jake) > 4. Re: mailman backlog (Jake) > 5. Re: March emails? (mark M) > 6. Re: vote for Omni for the Oakland Indie awards (mark M) > 7. Re: sonic modem refunded (Maximilian Klein) > 8. Important meeting this wednesday! (Marc Juul) > 9. voip phone calls (Jake) > 10. O P D S T A T E D I N T E N T: '... to SHUT DOWN THE OMNI due > to the "hacking activities"...'?!!? (johanna faust) > 11. Re: O P D S T A T E D I N T E N T: '... to SHUT DOWN THE OMNI > due to the "hacking activities"...'?!!? (Marc Juul) > 12. Re: Important meeting this wednesday! (Jenny Ryan) > 13. Re: Important meeting this wednesday! (Marc Juul) > 14. Re: need M8 bolts for robot (Lesley Bell) > 15. No More Meetings — Only Parties Instead!!! (Matt Senate) > 16. Re: No More Meetings — Only Parties Instead!!! (Jake) > 17. Re: No More Meetings — Only Parties Instead!!! (robb) > 18. Re: No More Meetings — Only Parties Instead!!! (Marc Juul) > 19. Re: No More Meetings — Only Parties Instead!!! (Marina Kukso) > 20. oscilloscope, power supply, signal generator "donation" (Jake) > 21. Re: [CCLmembers] Fwd: oscilloscope, power supply, signal > generator "donation" (Cere Misc) > 22. Re: oscilloscope, power supply, signal generator "donation" (Zach) > 23. Re: oscilloscope, power supply, signal generator "donation" > (Jacob Mowbray) > 24. Re: oscilloscope, power supply, signal generator "donation" > (Anthony Di Franco) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 3 Apr 2016 23:17:40 -0700 > From: Cere Misc <cere.misc(a)gmail.com> > To: "Patrik D'haeseleer" <patrikd(a)gmail.com> > Cc: sudo-discuss <sudo-discuss(a)lists.sudoroom.org> > Subject: Re: [sudo-discuss] March emails? > Message-ID: > <CAKtSE-v1W= > b7CFZCdY4qKCskraTisr+9ZK0mkh2rkU4BkT06fg(a)mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Yes. Me too. I think someone approved a bunch of emails from ppl that had > sent them in under email addrs that weren't subscribed (such as mine). > > On Sun, Apr 3, 2016 at 10:02 PM, Patrik D'haeseleer <patrikd(a)gmail.com> > wrote: > > > Odd - Over the past half hour, I've been getting dozens of sudo-discuss > > emails from the month of March. Anyone else seeing this? > > > > Just wondering whether this logjam was on my end, or sudo-discuss... > > > > Patrik > > > > _______________________________________________ > > sudo-discuss mailing list > > sudo-discuss(a)lists.sudoroom.org > > https://sudoroom.org/lists/listinfo/sudo-discuss > > > > >

10 years, 3 months

Re: [sudo-discuss] oscilloscope, power supply, signal generator "donation"

by Zach

Thanks for sending out this email and CC-ing me jake. To be clear, these are meant as a donation (no quotation marks) to sudo room, for as long as sudo room exists. What I mentioned to Jake was that if sudo room closes for some reason (we are all struggling with rent in the bay here) I would want them back. They would be the property of sudo room for as long as sudo room is around (hopefully forever). does that make sense / is that agreeable to people? i wouldnt care if the equipment was damaged from use or whatever if it is very hard to pick them up i can make some time in the coming weeks to drive it all down there. #hackersolidarity! -Zach -------------------------------------------- On Thu, 4/7/16, Jake <jake(a)spaz.org> wrote: Subject: oscilloscope, power supply, signal generator "donation" To: sudo-discuss(a)lists.sudoroom.org Cc: "Zach T" <organic_unity(a)yahoo.com>, jacobmowbray(a)gmail.com Date: Thursday, April 7, 2016, 1:52 PM Zach wants to donate these nice pieces of test equipment to sudoroom: http://imgur.com/wZuPmi2 http://imgur.com/LTSFfOe http://imgur.com/oQQsfgc and Jacob M. has volunteered to go pick them up (although he doesn't have a car and they're in SF) Does anyone with a car want to go to SF to pick them up? but Zach wants to know that he can get them back whenever he wants. Zach, Sudoroom can't guarantee the safety of your equipment that is left there. But I can say that my LeCroy 9150 and Sorensen DCR-2025B and lots of other good stuff are there and i'm not worried about them, and you shouldn't worry either. If you ever need to come get these things back you can do so. We appreciate you letting us use them in the meantime. -jake

10 years, 3 months

Re: [sudo-discuss] [CCLmembers] Fwd: oscilloscope, power supply, signal generator "donation"

by Cere Misc

Jake, Anthony has volunteered (below) to pick them up. Could you fill him in on the details? On Thu, Apr 7, 2016 at 2:16 PM, Anthony Di Franco <di.franco(a)gmail.com> wrote: > Looks like I could fit those in my milk crates. I can stop by this evening > or tomorrow. What's the location? > > On Thu, Apr 7, 2016 at 2:12 PM Cere Misc <cere.misc(a)gmail.com> wrote: > >> Anybody with a car able to pick up this fantastic equipment for Sudoroom? >> >> >> ---------- Forwarded message ---------- >> From: Jake <jake(a)spaz.org> >> Date: Thu, Apr 7, 2016 at 1:52 PM >> Subject: [sudo-discuss] oscilloscope, power supply, signal generator >> "donation" >> To: sudo-discuss(a)lists.sudoroom.org >> Cc: Zach T <organic_unity(a)yahoo.com>, jacobmowbray(a)gmail.com >> >> >> Zach wants to donate these nice pieces of test equipment to sudoroom: >> >> http://imgur.com/wZuPmi2 >> http://imgur.com/LTSFfOe >> http://imgur.com/oQQsfgc >> >> and Jacob M. has volunteered to go pick them up (although he doesn't have >> a car and they're in SF) >> >> Does anyone with a car want to go to SF to pick them up? >> >> but Zach wants to know that he can get them back whenever he wants. >> >> Zach, Sudoroom can't guarantee the safety of your equipment that is left >> there. But I can say that my LeCroy 9150 and Sorensen DCR-2025B and lots >> of other good stuff are there and i'm not worried about them, and you >> shouldn't worry either. If you ever need to come get these things back you >> can do so. We appreciate you letting us use them in the meantime. >> >> -jake >> _______________________________________________ >> sudo-discuss mailing list >> sudo-discuss(a)lists.sudoroom.org >> https://sudoroom.org/lists/listinfo/sudo-discuss >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Counter Culture Labs Members" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to CCLmembers+unsubscribe(a)googlegroups.com. >> To post to this group, send email to CCLmembers(a)googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/CCLmembers/CAKtSE-sn_6mYTLR1WY4FrQ0PTVgag… >> <https://groups.google.com/d/msgid/CCLmembers/CAKtSE-sn_6mYTLR1WY4FrQ0PTVgag…> >> . >> For more options, visit https://groups.google.com/d/optout. >> >

10 years, 3 months

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