#robotics Logs

May 21 2014

00:14 rue_more what votlage were the toys?
00:18 bubble_beam rue_more, raspberry pi works at 5v and i dont really know about the motors
00:19 rue_more how many of what type of battery did the toys take?
00:19 rue_more did any of them take a B cell?
00:20 bubble_beam rue_more, usually 4 AAA cells
00:20 rue_more what is the voltage of an AAA cell?
00:20 bubble_beam 1.5V which makes it 6V for the motor
00:20 bubble_beam :P
00:20 rue_more ok, the motors are 6V
00:21 bubble_beam and the rpi is 5V
00:21 rue_more ok
00:21 rue_more does te rpi have a power regulator?
00:21 bubble_beam nothing inbuild
00:21 rue_more ok
00:21 rue_more you know what works good?
00:21 bubble_beam nope
00:22 rue_more the car chargers for cars
00:22 rue_more er, the usb chargers for cars
00:22 bubble_beam ?
00:23 rue_more http://www.ebay.ca/itm/gi-b-USB-Mp3-Mp4-Adapter-for-iPhone-3G-3GS-Car-Charger-W-C-/181130189546
00:23 rue_more or
00:23 bubble_beam rue_more, i want to select a battery
00:24 bubble_beam that is a charger ,right?
00:25 rue_more http://www.ebay.ca/itm/New-DC-DC-Buck-Converter-Step-Down-Module-LM2596-Power-Supply-Output-1-23V-30V-/161113720125
00:25 rue_more no its a step down power regulator
00:25 rue_more if you use two of those, you can have one supply the 5V for the rpi and the other supply the 6V for the mtoors
00:25 rue_more which means you can use a 12V abttery
00:26 bubble_beam rue_more, but wont they be heavy for the motors?
00:26 rue_more and because those are switching converters, the current out of them will be higher than the current in
00:26 bubble_beam http://www.ebay.in/itm/SUNCA-6V-4-5Ah-Sealed-Lead-Acid-Rechargable-Battery-RB640Cs-/171316633202?pt=LH_DefaultDomain_203&hash=item27e3445e72
00:26 rue_more your robot will not slow down when the battery dies
00:26 bubble_beam something like that ^^
00:26 rue_more no, use higher voltage
00:26 rue_more 12V
00:26 rue_more with those converters
00:26 rue_more lots of advantages
00:26 bubble_beam okay
00:26 rue_more how big is the robot?
00:26 rue_more 5Ah is a lot
00:27 rue_more I also dont suggest buying lead-acid batteries over ebay, shipping is killer
00:27 rue_more li-ion yes,
00:27 bubble_beam pi weighs around 75 grms or something
00:27 bubble_beam 75gms*
00:28 rue_more you know how much a 6V 5Ah lead-acid weighs?
00:28 bubble_beam 750 gms
00:28 bubble_beam :P
00:28 rue_more no, it weights like .75kg!
00:28 rue_more :P
00:28 bubble_beam lol
00:29 rue_more use li-ion if you can
00:29 rue_more look at this
00:29 rue_more if you use a 6V battery, the top charged voltage is 7.2V
00:29 rue_more it will be dead at 5V
00:29 bubble_beam mm,okay
00:30 rue_more normal regualators need to have in what they put out + alteast 2V
00:30 bubble_beam so 12 v li cells?
00:30 rue_more so as soon as your battery starts to get used, the rpi will die
00:30 bubble_beam okay
00:30 rue_more if you use 12V battery, when its dead there is still way more than 7V available
00:31 bubble_beam great
00:31 bubble_beam but the cost?
00:31 rue_more but you need the switching converters like I showed you
00:31 rue_more you dont need 5Ah
00:31 rue_more hey
00:31 rue_more that was 4ah
00:31 rue_more anyhow
00:32 rue_more 12V 4Ah would be lots
00:32 bubble_beam how much Ah will i neeD?
00:32 bubble_beam i cant find such a one in ebay
00:33 bubble_beam most of them are in mAh
00:33 rue_more 4000mAh
00:33 bubble_beam ::P
00:33 bubble_beam i am sorry
00:34 rue_more searing
00:34 rue_more ...
00:36 rue_more http://www.ebay.com/itm/KDQ14-Best-12V-4000mAh-Lithium-ion-Rechargeable-Battery-Pack-AC-Charger-2369-EU-/121199800067
00:36 rue_more there is one with a charger somewhere
00:37 rue_more oh, thats it
00:37 bubble_beam (y)
00:37 bubble_beam its us
00:38 rue_more use the keywords
00:38 rue_more you should be able to buy something regardless of the listed currency
00:38 rue_more its form china
00:39 bubble_beam lemme see
00:41 rue_more I could buy it and ship it to you, but shipping from canada costs about a million dollars
00:42 bubble_beam lol
00:42 bubble_beam i was thinking of making an AI :P
00:42 rue_more even if I ship it to my neighbour
00:42 rue_more still takes 3 weeks too
00:44 bubble_beam i will have to search some electronics shop
00:44 bubble_beam rue_more, http://www.ebay.in/itm/ENVIE-4pcs-RECHARGEABLE-AA-1000-mAh-Ni-CD-BATTERY-CELL-/271466052527?pt=IN_Camera_Camcorder_Accessories&hash=item3f34a33baf
00:44 bubble_beam what about that one. i could use 10 of them?
00:45 rue_more maybe look for NiMh
00:46 bubble_beam rue_more, okay
00:46 bubble_beam rue_more, thanks mate
00:46 bubble_beam :)
00:46 rue_more battery cases come in 2, 4 6 and 8
00:47 bubble_beam 8*1.2 = 9.6 right
00:47 bubble_beam that would be enough right
00:48 bubble_beam i could use a stepdown and make it 5 and 6 for rpi and motors
00:48 bubble_beam right
00:48 rue_more 1V when dead
00:48 rue_more I think that should still work
00:51 rue_more if you can get something thats easy to charge
01:06 Hyratel never draw a 12v PbA below 10.5v
01:08 rue_more don't tug on Superman's cape.
01:08 rue_more don't spit in the wind
01:08 rue_more don't pull the mask off that old Lone Ranger
01:09 rue_more don't mess around with Jim.
01:09 bubble_beam pba?
01:09 rue_more lead acid
01:10 bubble_beam okay Pb
01:10 rue_more gnight :)
01:10 bubble_beam but its heavy
01:10 rue_more dont use a lead battery for a portable robot
01:10 bubble_beam rue_more, okay :)
01:10 bubble_beam thanks
01:10 rue_more use NiMh, NiCd, or lithium
01:10 bubble_beam and good night
01:10 Hyratel how large of a robot?
01:10 rue_more 12'
01:10 rue_more oh his, nevermind
01:10 Hyratel https://www.sparkfun.com/news/1450
01:11 bubble_beam Hyratel, its rpi robot and small toy motors
01:11 Hyratel oh. yeah
01:11 Hyratel PbA is not good for small stuff
01:11 bubble_beam but 8 Ni-Mh will that be heavy?
01:11 bubble_beam for 6v servos?
01:11 Hyratel ^ that link above is on the small side for where PbA becomes marginally practical
01:12 bubble_beam Hyratel, thats one hell of a robot
01:12 bubble_beam mine is small
01:12 Hyratel budget also becomes a sticking point with a robot that large
01:12 Hyratel $650 all-in
01:12 bubble_beam lol
01:13 bubble_beam Hyratel, i am thinking of makinng a simple portable robot for my AI experimentations
01:15 Hyratel portable just means it has wheels
01:16 Hyratel rather no
01:16 bubble_beam yep
01:16 Hyratel portable means you can move it without major infrastructure needing to be put down
01:16 Hyratel mobile means it moves under its own power
01:16 bubble_beam okay , mobile then
14:34 TELunus What's a good source of (cheap) wheels? My motors are d=67mm, so I guess I'll need something a bit bigger than that.
14:35 SlaveToTheSauce thrift store
14:35 SlaveToTheSauce strollers, wheelchairs, tricycles, etc...
14:40 SquirrelCZECH TELunus: find local racing track for OffRoad RC Cars
14:41 SquirrelCZECH these people tend to throw out wheels which can't handle racing
14:41 SquirrelCZECH (but are perfect for robotics use :) )
14:49 wallo has anyone controlled their robot using text messages?
14:52 SlaveToTheSauce no and i'm not sure i'd avise doing so
14:52 SlaveToTheSauce sms is pretty unreliable
14:52 wallo it seemed interessting since you would have far range without having to worry about line of sight
14:54 SlaveToTheSauce if you're going to have a gprs modem anyway you may as well just use a tcp connection
15:04 GuShH rue_more: http://imgur.com/gallery/teOs6il
15:54 -wilhelm.freenode.net:#robotics- [freenode-info] channel flooding and no channel staff around to help? Please check with freenode support: http://freenode.net/faq.shtml#gettinghelp
17:19 MrCurious http://stream.pleated-jeans.com/post/86421678579/via
20:13 rue_more GuShH, haha
20:13 rue_more forgot to let go of the door knob eh?
20:14 rue_more we dug up the yard today
20:14 rue_more the test hole *just happened* to be in the ONLY PERFECT spot
20:15 rue_more as soon as we dug around to clear things up it was a nightmare
20:23 GuShH poop everywhere?
20:23 GuShH did mr hankey attack you?
20:28 rue_more no
20:29 rue_more the clay level came up to about 24"
20:29 rue_more where we test dugit was at almost 6 feet
21:15 Tom_itx why such a drastic change?
21:15 Tom_itx was it dug up there before?
21:15 m_itx gives rue_more some det-
23:06 rue_more not sure on the history
23:16 rue_shop2 set the faninator to maximum coolation!