sudo-discuss July 2015

sudo-discuss@sudoroom.org

59 participants
123 discussions

by Omni Oakland

Hi again, In addition to the outstanding rent invoice for April, please see the attached invoice for shared expenses at the Omni in April. It would be great if you're able to pay at least part of this invoice as soon as possible. The Omni is in a precarious financial situation currently so I'm asking all member collectives to pay outstanding invoices if they're able. Let me know if you have any questions. Thanks again, Sarah ------------------------ Invoice Summary -------------------… [View More]

10 years, 1 month

Re: [sudo-discuss] wheelchair motor controller

by Jake

if you put a 1 ohm resistance, you will just blow up the resistor. 24 volts divided by 1 ohm = 24 amps 24 volts times 24 amps = 576 watts you need to find the highest number of ohms that will still cause the motor controller to not give you an error. Lets say you find that a 100 ohm resistor (in place of the missing motor) causes the controller to be OK. When you move the joystick, and it tries to turn the fake motor, it will give it up to 24volts. But it's a 100 ohm resistor. 24v / … [View More]100 ohm = 0.24 amps 24v * 0.25 amps = 5.76 watts if it works with a 100 ohm, you should use that. 5.76 watts is reasonable. 576 watts is most of a horsepower and is not reasonable. 5 in case you're not confused i'll tell you this: the power a motor consumes (from a fixed voltage source for example) depends on the amount of force it's putting out. So if you have a motor just spinning a wheel in the air it doesn't take as much power as if you're making it grind grain, or push a fat person up a steep incline. The ohms you measure when you use a multimeter on the stopped motor correspond to its MAXIMUM power, basically. so if you stopped the motor and applied 24v, 576 watts would flow through it and heat it up pretty fast. But if you let it spin freely in the air, its effective impedance would be much higher than 1 ohm! as for how to isolate the motors for different jobs.. we can read the manual on the control box and adjust the settings, or just hook up the computer control and let it do all the work. I don't know though. -jake On Thu, 16 Jul 2015, Robert Benson wrote: > i'm such an idiot. when i checked the motor resistance, i checked the controller's motor circuit resistance. the actual motor resistance is 1 ohm. > > however, even idiots get lucky...the motor worked with 100ohm. having realized the above, i will not power it again until i find a 1ohm resistor. > > for the record, moving the joystick in any direction moves the wheel in some way. so how do we isolate the motors for different jobs? > > On Thu, Jul 16, 2015 at 12:49 AM, Jake <jake(a)spaz.org> wrote: > what do you mean both motors > > you only have one motor last i checked. > > On Thu, 16 Jul 2015, Robert Benson wrote: > > my ohmmeter had a "k" in front of the ohm symbol when it read 150 k ; not a M or just the ohm symbol. > > datasheet i posted earlier seemed to suggest the motor is 120V while the brake solenoid is 24V > > both motors read 150kiloohm :/ > > On Wed, Jul 15, 2015 at 11:45 PM, Robert Benson <sf99er(a)gmail.com> wrote: > gonna have to have a high wattage rating, huh? > > On Wed, Jul 15, 2015 at 11:41 PM, Robert Benson <sf99er(a)gmail.com> wrote: > 150k says the motor > > > on hunt for same > > On Wed, Jul 15, 2015 at 11:30 PM, Jake <jake(a)spaz.org> wrote: > a wire jumper is approximately zero ohms, which will destroy stuff when power flows through it. > > the motor controller is complaining because it sees infinity ohms across the missing motor's terminals. So just like the brake, the > solution is to put a resistor across the missing motor's terminals. > > if we want more than one motor, we can just put the other motor on the missing connector and use the one controller to control both > motors. > > if we need more than two motors, we can use relays or switches with the same controller, or we could get more controllers. But lets > start > with one or two motors. > > -jake > > On Wed, 15 Jul 2015, Robert Benson wrote: > > agreed > > i was thinking that since controller still said check right motor connector after i crossed the brake terminals w/resistor that > i needed to jump it. when i jumped > them the check right motor code went out which seemed to indicate the error was corrected. luckily i had to hold the jump wire & > resistors against the contacts so i > noticed the heat immediately after touching the joystick and cut the power. check right brake code has returned as before. > > maybe building a 120vac/24vdc controller would be better...we probably want four or more of these puppies for the lighting > trusses > > On Wed, Jul 15, 2015 at 11:00 PM, Jake <jake(a)spaz.org> wrote: > you should not short out stuff with even a thin wire. > > you are going to destroy the motor controller if you continue on this path > > what are you thinking? do not short out the motor terminals. > > On Wed, 15 Jul 2015, Robert Benson wrote: > > connected a thin wire across motor side of connector (while 110ohm across brake side) and got movement but wire got > real hot...too scared > i'll damage the controller > right now to try a bigger gauge > > On Wed, Jul 15, 2015 at 10:26 PM, Robert Benson <sf99er(a)gmail.com> wrote: > connected 110ohm across brake terminals but no worky > > On Wed, Jul 15, 2015 at 9:44 PM, Jake <jake(a)spaz.org> wrote: > should be fine > > On Wed, 15 Jul 2015, Robert Benson wrote: > > might have to upgrade the roomba motor & controller to hit mice > > will 150ohms be too much/work/hurt anything? i found a 100ohm 5w & 50ohm ?w i plan on running in series > if i dont find a more suitable value > > > On Wed, Jul 15, 2015 at 8:21 PM, Patrik D'haeseleer <patrikd(a)gmail.com> wrote: > > On Jul 15, 2015 6:05 PM, "Jake" <jake(a)spaz.org> wrote: > > > if you want to play with robots i have plenty, like roombas which won't break > your legs running you over. > > > Roomba + tazer = no more mouse problems! > > Patrik > > > > > > > > > > > > > > > [View Less]

10 years, 1 month

Spending much time learning at Sudoroom lately

by Romy Ilano

Thank you! Sent from my iPhone

10 years, 1 month

Re: [sudo-discuss] wheelchair motor controller

by yar

On Wed, Jul 15, 2015 at 1:46 PM, Jake <jake(a)spaz.org> wrote: > and congratulations, you're close! once it works, we can use the other > electronics (this is from an old robot) to automate the process of sending > the screen up and down. Wait, are you talking about ... MC Hawking? Is MC Hawking being reassembled into a movie screen??

10 years, 1 month

Fwd: [omni-discuss] Important Omni meetings in July

by Matthew Senate

---------- Forwarded message ---------- From: Laura Turiano <scylla(a)riseup.net> Date: Wed, Jul 15, 2015 at 5:31 PM Subject: [omni-discuss] Important Omni meetings in July To: "discuss(a)lists.omnicommons.org" <discuss(a)lists.omnicommons.org> Friends, *There are 3 important meetings coming up in July that we need people who support the Omni to attend**.* On Thursday 7/16, at the regular delegates meeting, several proposals will be discussed along with information about David … [View More]

10 years, 1 month

Outernet edit-a-thon this weekend

by Pete Forsyth

Hi all, There's a cool event based in Uganda, but designed for remote participation, this weekend. "Outernet" is a project to repurpose satellites to "broadcast" free information, that can be picked up by inexpensive receivers, for free, and then reshared for free over local networks/WiFi. A way to get information to remote and underserved parts of the world. It's one-way communication, so certainly not a replacement for the Internet or a total solution to the Digital Divide -- but a very … [View More]

10 years, 1 month

Re: [sudo-discuss] wheelchair motor controller

by yar

On Wed, Jul 15, 2015 at 6:03 PM, Jake <jake(a)spaz.org> wrote: > if you want to play with robots i have plenty, like roombas which won't > break your legs running you over. > > mchawking was too dangerous to live. Aw it's ok, I wasn't upset. Glad that he is returning to life in some form, actually. :)

10 years, 1 month

wheelchair motor controller

by Robert Benson

Hey all, I'm trying to build a winch for the 14' projection screen that going up over the ballroom stage out of a wheelchair motor assembly. Per Jake's suggestion, I hacked 2 server PSUs to get 24v@14a but the controller is not working and the error code says the right wheel/motor is missing/not engaged. Anyone know what I am missing? Do I need to jump something to get the controller to engage while it is "incomplete"? Thank you, robb let thar b lulz

10 years, 1 month

Invoice 1006 from Omni Oakland

by Omni Oakland

Hi there, Checking in about payment for Sudo Room's rent in April (see attached invoice). I apologize for not being totally in the loop on this, but it's my impression that the Omni agreed to give Sudo a $135.00 rebate on your April rent as reimbursement for paying the Omni's wifi. Is that correct? If so, please see the outstanding balance on your invoice for April 2015 rent and process payment as soon as you're able. Otherwise, please let me know if any of this is incorrect so I can update … [View More]

10 years, 1 month

Arduino Working Group 1st and 3rd Monday of July at Noisebridge from 7pm-9pm

by James Sundquist

noisebridge.net/arduino Bring your enthusiasm, laptop, Arduino hardware, and have the IDE installed. All are encouraged.

10 years, 1 month

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sudo-discuss July 2015