bump! does anyone want to help get one or both vending machines working? This
would be a great way to vend arduinos, ESP8266's, candy bars, and whatever else
we want to sell to sudoers and others. Much of the work has already been done.
-jake
---------- Forwarded message ----------
> Date: Sat, 9 Apr 2016 17:42:06 -0500
> From: jake(a)spaz.org
> Subject: [sudo-discuss] vending machine homing switch mystery solved
>
> 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
> _______________________________________________
> sudo-discuss mailing list
> sudo-discuss(a)lists.sudoroom.org
> https://sudoroom.org/lists/listinfo/sudo-discuss
Hi all,
I'm a new member. I'm excited to be a part of this community. There are
great people and great resources in the space. I've also noticed that is
kind of disorganized, cluttered, and the organization is broke! As a medium
to long term goal I think it would be great to gain financial solvency and
be able to start saving for larger projects as well as clean up the space
and make it an amazing workspace with lots of working tools, spare parts,
and workspace.
I reviewed the articles of association and noticed a few roles that were
not apparent to me in the meetings I've attended. For me the first goal of
implementing change is identifying the leadership and working with them to
build a consensus.
Is there an existing facilitator, scribe, exchequer, and conflict steward?
Thanks,
David
Hey there privacy hackers,
The weekly privacy hackathons hosted at Noisebridge via the Cypherpunks
Write Code <https://www.meetup.com/Cypherpunks-Write-Code/> meetup group
are generally 4-10pm, but *tomorrow* (Saturday) it is *7pm to 10pm* (at
Noisebridge).
This is because of RIOTcon <https://riotcon.github.io/>, which I'm speaking
at:
RIOTcon (Radical Interactive Open Technology Conference) is a new
> conference seeking to highlight the intersections between radicalism, art,
> and technology.
RIOTcon is from 11am till 5pm. My talk is at noon, and I'll be staying for
the entire event before heading to Noisebridge for the CWC hackathon.
More details about RIOTcon, including talk
descriptions/summaries/abstracts: https://www.facebook.com/
events/2014315468855418/
I hope to see you all at the conference and/or the hackathon!
--Steve
P.S. *Of course* my talk is about Pursuance <https://pursuanceproject.org/>
!
Following on from the finances discussion during last week's meeting...
On manual review of our Stripe account, I see 36 monthly recurring dues
subscriptions through sudo-humans for a total of $1,290 per month.
There were a handful of accounts with failing transactions. (This tends
to happen when a card expires or a number changes.) However, those
accounts probably add up to <$100 per month altogether.
If we expect, say, $1,200 per month actually paid, and our sole bill is
to Omni, for $2,000, we are running an $800 shortfall. $800 over 30
people is $27 per. $800 over 15 people is $54 per.
I've just updated my plan accordingly.
As I recall, one of the big open questions from the meeting was whether
Sudo pays any other recurring bills. We know we have insurance, and use
utilities. It wasn't clear whether those are billed through Omni, and
covered by the $2,000 per month, or not.
FYI
---------- Forwarded message ----------
From: Yardena Cohen <yardenack(a)gmail.com>
Date: Thu, Jan 18, 2018 at 2:04 PM
Subject: Plumbing work next Thursday 1/25 - NO WATER
To: discuss <discuss(a)lists.omnicommons.org>
Our plumber will be doing repairs in Omni's wheelchair bathroom next
Thursday, January 25th, starting around 10am. We'll probably have to
turn off the water lines to the whole building for at least part of
the time. Thanks for understanding.
Folks, a crony gave me a 6+1 DVD duplicator and a couple of external
firewire DVD-RW burners, plus a laptop cooler pad dealer (see attached
picture).
Maybe we could use the duplicator to burner videos of an event in the
ballroom for quick distribution. I have a few spools of DVD-RWs I could
throw at it. Otherwise this stuff just goes in my e-cycling pile, though
I have to say it does make a pretty cool electronic samurai sculpture in
my living room.
https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Delectronics&fiel…
Edlardo
--
+++++++++++++++++++++++++++++++++++++++++++
If God is watching us the least we can do is be entertaining.
Edmund Joseph Biow
328 Haddon Road
Oakland, California 94606
(510) 763-0591 (try first, messages checked in morning, dumb phone, no
caller ID, leave number)
(415) 623-6473 (cell)
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Hi everyone,
I am removing bogus-looking wordpress users, subject to my own
discretion as to bogosity. One such account has the username part of the
email address as "gcjrminsgbkbwbacdega". That kind of thing.
If any real user finds that their wordpress account stops working, I
apologize. Should that happen, please request a new account.
Thanks for understanding.
--
Charley
https://forum.diybookscanner.org/viewtopic.php?f=16&t=3477
Jonathon Duerig (I believe he took over much from Daniel Reetz) responded
that we have a 'hackerspace' model scanner and offered some advice. I asked
if we could buy the "lighting system" parts of a 'quill' model and if it
would be feasible to mount on our 'hackerspace' model. The logic is well
put here
http://diybookscanner.org/archivist/index322f.html?page_id=459
beginning with the sentence "Lighting for scanners is incredibly difficult
to do right. "
Check back there for the reply
i am replying your message to the sudoroom-discuss list
On Wed, 10 Jan 2018, daevron wrote:
> Hey Jake!
>
> We were in touch last year about hardware hack night and I came out to a
> couple of gatherings at Sudo room.
>
> I was at the Omni today and swung by the space to ask about the laser
> cutter and had a few follow-up questions for you:
>
> Is there someone who offers facilitation in its use or is there some
> tutorial/guide I should read about it? Is there a sign-up sheet to use it
> or an ideal time this weekend/next week? Can it cut grip tape and how
> precise are the cuts?
>
> I have art organized into vector files.
>
> Thanks :)
>
> -d
>
